JP2008099321A - Communication system, information processor, server and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system wherein communications between a plurality of information processing apparatuses that communicate with each other via a communication control apparatus (NAT) can be established with an enhanced reliability. <P>SOLUTION: A first information processing apparatus (1) transmits a bubble packet to a port assigned from reference ports of a second communication control apparatus (4) after a prescribed port assignment. A server (6) detects the location of a bubble packet transmission port, which is a port of a first communication control apparatus (3), for transmitting the bubble packet. A second information processing apparatus (2) transmits a response packet to the detects bubble packet transmission port. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication system that establishes communication between a plurality of information processing apparatuses.

First, classification of NAT (Network Address Translation) will be described. The NAT has a transmission port assignment rule and a reception filter rule, and the NAT is classified by a combination thereof. The transmission port assignment rule does not depend on the destination (IP address, port) of the packet. If the port of the information processing device on the NAT local side (for example, the LAN side) and the IP address are the same, the assignment is made to the NAT. The Cone type with the same port on the global side (for example, the WAN side such as the Internet) and the address to which a new port is assigned for each destination address of the packet
There are a Sensitive type and a Port Sensitive type in which a new port is assigned to each destination port of a packet. An Address Sensitive filter that receives a packet only from an address from which a packet is transmitted from the port is included in the reception filter rule for determining the possibility of receiving a packet from the global side for a port from which a packet is transmitted from the NAT local side. There are a Port Sensitive filter that receives a packet only from a port that has transmitted a packet from the port, and a No filter that does not have a filter. By combining these transmission port assignment rules and reception filter rules, NAT can be classified into the following nine types (see FIG. 32).

  Full Cone NAT (hereinafter referred to as F NAT): A transmission port assignment rule is a Cone type, and a reception port filter rule is a No filter.

  Restricted Cone NAT (hereinafter referred to as R NAT): a transmission port allocation rule is a Cone type, and a reception port filter rule is an Address Sensitive filter.

  Port Restricted Cone NAT (hereinafter referred to as PR NAT): a transmission port assignment rule is a Cone type, and a reception port filter rule is a Port Sensitive filter.

  Symmetric (a) NAT (hereinafter referred to as Sa NAT): a transmission port assignment rule is an Address Sensitive type, and a reception port filter rule is a No filter.

  Address Sensitive Symmetric NAT (hereinafter referred to as AS NAT or Sb NAT): A transmission port assignment rule is an Address Sensitive type, and a reception port filter rule is an Address Sensitive filter.

  Symmetric (c) NAT (hereinafter referred to as Sc NAT): a transmission port assignment rule is an Address Sensitive type, and a reception port filter rule is a Port Sensitive filter.

Symmetric (d) NAT (hereinafter referred to as Sd NAT): a transmission port assignment rule is a Port Sensitive type, and a reception port filter rule is a No filter.

  Symmetric (e) NAT (hereinafter referred to as Se NAT): a transmission port assignment rule is a Port Sensitive type, and a reception port filter rule is an Address Sensitive filter.

  Port Sensitive Symmetric NAT (hereinafter referred to as PS NAT or Sf NAT): A transmission port allocation rule is a Port Sensitive type, and a reception port filter rule is a Port Sensitive filter.

  In communication using such NAT, it has been considered to establish communication between PC1 and PC2 without using a server as shown in FIG.

The above technical contents are described in, for example, D.I. Yon, “Connection-Oriented
"Media Transport in SDP", [Online], March 2003, [March 25, 2004 search], Internet <URL: http: // www. ietf. org / internet-drafts / draft-ietf-mmusic-sdp-comedia-05. txt> (hereinafter referred to as “Non-Patent Document 1”), or Y.S. Takeda, “Symmetric NAT Traveling STUN”, [Online], June 2003, [March 25, 2004 search], Internet <URL: http: // www. cs. cornell. edu / projects / stunt / draft-takeda-symmetric-nat-travelsal-00. txt> (hereinafter referred to as “Non-Patent Document 2”). Furthermore, J. et al. Rosenberg, J.M. Weinberger, C.I. Huitema, R.A. Mahy, “STUN-Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translaters (NATs), [Online], March 2003, Network. Internet <URL: http: // www. ietf. org / rfc / rfc3389. txt> (hereinafter referred to as “Non-Patent Document 3”).

  However, even in this case, there may be a combination of NATs for which communication cannot be established. In FIG. 33, when communication is performed from PC1 which is an information processing apparatus connected to the local side of NAT1 to PC2, NAT1 is referred to as NAT on the transmission side, and NAT2 is referred to as NAT on the reception side. Then, combinations of NATs that can establish communication between PC1 and PC2 are as shown in FIG.

  Here, the connection of “* 1” in FIG. 34 is conventionally known, the connection of “* 2” is described in Non-Patent Document 1, and the connection of “* 3” is the above non-connection. It is described in Patent Document 2. Even in the case of a NAT combination that can establish communication, in the connection of “* 3”, the port width of the NAT is surely known, and the position of the latest NAT port on the receiving side is surely known. Unless it is possible, communication cannot be established, and there is a problem that uncertainty remains.

Furthermore, the combination of FIG. 34 does not include the case where Sa NAT or Sc to Se NAT is used, but even when such NAT is used, peer-to-peer (Peer to peer) via NAT is also included. Peer) communication (for example, P in FIG.
I want to be able to establish communication between C1 and PC2.

In addition, as a premise for establishing communication between information processing apparatuses, the position of the NAT port through which a bubble packet transmitted from one information processing apparatus (a packet transmitted in order to leave a transmission history in the NAT) has been surely determined. I want to detect it.
D. Yon, “Connection-Oriented Media Transport in SDP”, [Online], March 2003, [March 25, 2004 search], Internet <URL: http: // www. ietf. org / internet-drafts / draft-ietf-mmusic-sdp-comedia-05. txt> Y. Takeda, “Symmetric NAT Traveling STUN”, [Online], June 2003, [March 25, 2004 search], Internet <URL: http: // www. cs. cornell. edu / projects / stunt / draft-takeda-symmetric-nat-travelsal-00. txt> J. et al. Rosenberg, J.M. Weinberger, C.I. Huitema, R.A. Mahy, “STUN-Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translaters (NATs), [Online], March 2003, Network. Internet <URL: http: // www. ietf. org / rfc / rfc3389. txt>

  One of the objects of the present invention is to provide a communication system or the like that can more reliably establish communication between a plurality of information processing apparatuses that perform communication via a communication control apparatus that controls communication.

  Another object of the present invention is to provide a communication system that can detect the position of a port in a communication control device through which a bubble packet transmitted from an information processing device has passed.

  In order to achieve the above object, a first information processing apparatus according to the present invention includes a first communication control apparatus that controls communication of a first information processing apparatus and a second information control apparatus that controls communication of a second information processing apparatus. The first information processing apparatus that communicates with the second information processing apparatus via the second communication control apparatus, and transmitted to leave a transmission history in the first communication control apparatus A reference port receiving unit that receives reference port information indicating a position of a reference port that is a port in the second communication control device serving as a reference for transmission of the first communication control, and the first communication control based on the reference port information A bubble packet transmitting unit that transmits the bubble packet to the second communication control device via a device; and a bubble packet that is a port of the first communication control device used for transmitting the bubble packet. A detection packet transmitter for transmitting a port detection packet to detect the position of the packet transmission port, and the second communication control device from the second information processing device to the bubble packet transmission port. A reply packet accepting unit that accepts a reply packet transmitted via.

  With such a configuration, it is possible to perform transmission of bubble packets based on the reference port information and reception of reply packets transmitted to the bubble packet transmission port detected using the port detection packet. Communication between the information processing apparatus and the second information processing apparatus can be established.

  The first information processing apparatus according to the present invention includes a first communication control apparatus that controls communication of the first information processing apparatus, and a second communication control apparatus that controls communication of the second information processing apparatus. The first information processing apparatus communicates with the second information processing apparatus via the first information processing apparatus, wherein the first communication control apparatus transfers the second communication control apparatus from the second information processing apparatus. Via which a bubble packet for leaving a transmission history is transmitted to the second communication control device, and a reference that is a port in the first communication control device serving as a reference for transmission of the bubble packet A reference port detection packet transmitter for transmitting a reference port detection packet for detecting the position of the port, and the second communication control used in transmitting the bubble packet from the second information processing apparatus Equipment A bubble packet transmission port receiving unit for receiving bubble packet transmission port information indicating the position of the bubble packet transmission port, and a reply packet transmission for transmitting a reply packet to the bubble packet transmission port indicated by the bubble packet transmission port information Part.

  With such a configuration, a reply packet can be transmitted to the bubble packet transmission port whose transmission history remains due to the transmission of the bubble packet, and between the first information processing apparatus and the second information processing apparatus. Communication can be established.

  The server according to the present invention includes a first information processing apparatus, a second information processing apparatus that controls communication of the first information processing apparatus, and the second information processing apparatus. A bubble that is transmitted by the first information processing apparatus to leave a transmission history in the first communication control apparatus, which is a server that establishes communication performed via a second communication control apparatus that controls communication of the apparatus. In order to detect the position of a reference port that is a port in the second communication control device serving as a reference of a packet transmission target, it is transmitted from the second information processing device via the second communication control device. A reference port detection unit that receives the reference port detection packet and detects the position of the reference port based on the reference port detection packet; and the reference port detection unit detects the reference port detection unit A reference port transmitting unit that transmits reference port information indicating a location to the first information processing device, and the first port used for transmitting the bubble packet from the first information processing device to the second communication control device. In order to detect the position of a bubble packet transmission port which is a port in one communication control device, a port detection packet transmitted from the first information processing device is received, and the bubble packet is based on the port detection packet. A bubble packet transmission port detection unit for detecting a position of the transmission port, and bubble packet transmission port information indicating the position of the bubble packet transmission port detected by the bubble packet transmission port detection unit are transmitted to the second information processing apparatus. A bubble packet transmission port transmission unit.

  With such a configuration, the position of the reference port in the second communication control device can be detected and notified to the first information processing device, and the position of the bubble packet transmission port can be detected and the second information The processing device can be notified.

  The server according to the present invention includes a first information processing apparatus, a second information processing apparatus that controls communication of the first information processing apparatus, and the second information processing apparatus. A bubble that is transmitted by the first information processing apparatus to leave a transmission history in the first communication control apparatus, which is a server that establishes communication performed via a second communication control apparatus that controls communication of the apparatus. In order to detect the position of a reference port that is a port in the second communication control device serving as a reference of a packet transmission target, it is transmitted from the second information processing device via the second communication control device. A reference port detection unit that receives the reference port detection packet and detects the position of the reference port based on the reference port detection packet; and the reference port detection unit detects the reference port detection unit A reference port transmitting unit that transmits reference port information indicating a location to the first information processing device, and the first port used for transmitting the bubble packet from the first information processing device to the second communication control device. In order to detect the position of a bubble packet transmission port that is a port in one communication control device, a port detection packet transmitted from the first information processing device is received, and the port detection is performed based on the port detection packet. A detection port detector for detecting a position of the port of the first communication control device through which the packet for detection has passed, and detection port information indicating the position of the port detected by the detection port detector. And a detection port information transmission unit for transmission to the processing device.

  With this configuration, the position of the reference port in the second communication control device can be detected and notified to the first information processing device, and the position of the first communication control device through which the port detection packet has passed can be detected. Can be detected and notified to the first information processing apparatus.

A communication system according to the present invention is a communication system including an information processing device, a communication control device that controls communication of the information processing device, and a server, and the information processing device includes the communication control device. A bubble packet transmission unit that transmits a bubble packet for leaving a transmission history in the communication control device, and a position of a bubble packet transmission port that is a port of the communication control device used in the transmission of the bubble packet Before and after the bubble packet transmitter transmits the bubble packet, the port detection packet used for
And a detection packet transmitter for transmitting to the server.

  With such a configuration, the position of the bubble packet transmission port can be detected by the port detection packet transmitted from the information processing apparatus. This detection may be performed by the server, the information processing apparatus, or another apparatus. By using the detected position of the bubble packet transmission port to transmit a packet from another device to the bubble packet transmission port, the packet can be accepted by the information processing device.

  As described above, the communication system or the like according to the present invention can establish communication between a plurality of information processing apparatuses via the communication control apparatus, and is useful as a communication between information processing apparatuses.

(Embodiment 1)
A communication system according to Embodiment 1 of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a communication system according to the present embodiment. In FIG. 1, the communication system according to the present embodiment includes a first information processing apparatus 1, a second information processing apparatus 2, a first communication control apparatus 3, a second communication control apparatus 4, and a server. 6. The first communication control device 3, the second communication control device 4, and the server 6 are connected via a wired or wireless communication line 5. This communication line 5 is, for example, the Internet.

  FIG. 1 shows a case where only the first information processing device 1 and the second information processing device 2 are connected to the first communication control device 3 and the second communication control device 4, respectively. However, other devices may be connected to the first communication control device 3 and the second communication control device 4.

  In the present embodiment, a case will be described in which the first information processing apparatus 1 operates as an information processing apparatus on the transmission side and the second information processing apparatus 2 operates as an information processing apparatus on the reception side. Here, the information processing apparatus on the transmission side is a side that issues a request for communication (connection) when establishing communication between the first information processing apparatus 1 and the second information processing apparatus 2 (in other words, , The side that sends bubble packets). On the other hand, the information processing apparatus on the receiving side is the information processing apparatus on the opposite side, that is, the information processing apparatus on the side that receives a communication request (in other words, the side that transmits a reply packet to the bubble packet). The bubble packet and reply packet will be described later.

  FIG. 2 is a block diagram illustrating a configuration of the first information processing apparatus 1. In FIG. 2, the first information processing apparatus 1 includes a communication unit 11, a reference port reception unit 12, a bubble packet transmission unit 13, a detection packet transmission unit 14, a port width detection packet transmission unit 15, The retransmission instruction receiving unit 16, the reply packet receiving unit 17, the retransmission packet transmitting unit 18, and the port width receiving unit 19 are provided.

  The communication unit 11 performs communication between each internal component of the first information processing apparatus 1 such as the bubble packet transmission unit 13 and the first communication control apparatus 3.

The reference port receiving unit 12 receives reference port information indicating the position of the reference port. Here, the reference port is a predetermined port in the second communication control device 4 and is a port that becomes a reference of a port that is a target of bubble packet transmission (a bubble packet transmission target port). The reception of the reference port information is, for example, receiving reference port information. The bubble packet will be described later.

  The bubble packet transmitter 13 transmits a bubble packet to the second communication controller 4 via the communication unit 11 and the first communication controller 3. This bubble packet is transmitted based on the reference port information received by the reference port receiving unit 12. Specifically, in the second communication control device 4, a bubble packet is transmitted from a reference port to a bubble packet transmission target port that is a port assigned after a predetermined port assignment. The bubble packet transmission target port is, for example, a port whose port interval with the reference port is M times the port width in the second communication control device 4 (M is an integer of 1 or more). Here, for example, when port assignment is performed so that the port number increases, the bubble packet transmission target port has a larger port number than the reference port. The port width in the second communication control device 4 is indicated by the port width information received by the port width receiving unit 19 described later. The bubble packet is a packet for leaving a transmission history in the first communication control device 3 in order to establish communication between the first information processing device 1 and the second information processing device 2. . Here, establishment of communication means starting peer-to-peer communication not via the server 6 between the first information processing apparatus 1 and the second information processing apparatus 2. Also, leaving the transmission history means that the first communication control device 3 assigns a port for receiving a reply packet described later (opens the port). This bubble packet may contain some information or no information. This bubble packet is transmitted by a connectionless protocol such as UDP (User Datagram Protocol).

  The detection packet transmitter 14 transmits the port detection packet to the server 6. This port detection packet is used to detect the position of the bubble packet transmission port. Here, the bubble packet transmission port is a port of the first communication control device 3 used for transmitting bubble packets. The port detection packet is transmitted before the bubble packet is transmitted and / or after the bubble packet is transmitted. In the present embodiment, a case where a port detection packet is transmitted before and after transmission of a bubble packet will be described. This port detection packet is transmitted by, for example, UDP or TCP (Transmission Control Protocol). This port width detection packet may contain some information or no information.

  The port width detection packet transmitter 15 transmits a port width detection packet used to detect the port width in the first communication control device 3 to the server 6 via the first communication control device 3. Here, the port width is the width (interval) of the ports that are used (assigned) continuously. For example, when the port width is “1”, the port used next to the port with the port number “20000” is the port with the port number “20001”. On the other hand, when the port width is “2”, the port used next to the port with the port number “20000” is the port with the port number “20002”. This port width detection packet may contain some information or no information.

  The retransmission instruction receiving unit 16 receives a retransmission instruction. Here, the retransmission instruction is an instruction to retransmit the bubble packet and the port detection packet. This retransmission instruction is accepted by reception, for example. When the retransmission instruction accepting unit 16 accepts the retransmission instruction, the detection packet transmitting unit 14 and the bubble packet transmitting unit 13 retransmit the port detection packet and the bubble packet, respectively.

The reply packet accepting unit 17 accepts a reply packet transmitted from the second information processing apparatus 2 via the second communication control apparatus 4. This reply packet is transmitted to the bubble packet transmission port. This reply packet is accepted by reception, for example. This reply packet may contain some information or no information.

  The reply packet transmitting unit 18 transmits the reply packet when the reply packet receiving unit 17 receives the reply packet. The re-reply packet is transmitted to the port of the second communication control device 4 used for transmitting the reply packet. This re-reply packet is transmitted by UDP, for example. This re-reply packet may contain some information or no information.

  The port width receiving unit 19 receives the port width information transmitted from the server 6. Here, the port width information is information indicating the port width in the second communication control device 4.

  FIG. 3 is a block diagram showing a configuration of the second information processing apparatus 2. In FIG. 3, the second information processing apparatus 2 includes a communication unit 21, a reference port detection packet transmission unit 22, a bubble packet transmission port reception unit 23, a reply packet transmission unit 24, and a re-reply packet reception unit 25. And a port width detection packet transmitter 26.

  Similar to the communication unit 11, the communication unit 21 performs communication between each component inside the second information processing device 2 such as the reference port detection packet transmission unit 22 and the second communication control device 4. Do.

  The reference port detection packet transmitter 22 transmits a reference port detection packet for detecting the position of the reference port to the server 6. This reference port is the latest port (the most recently assigned port) at the time when the reference port detection packet is transmitted among the ports assigned by the second communication control device 4. In other words, the server 6 can detect the position of the latest port assigned by the second communication control device 4 by transmitting the reference port detection packet. This reference port detection packet is transmitted by, for example, UDP or TCP. This reference port detection packet may contain some information or no information.

  Bubble packet transmission port receiving unit 23 receives bubble packet transmission port information. Here, the bubble packet transmission port information is information indicating the position of the bubble packet transmission port. For example, the position of the bubble packet transmission port is indicated by the port number of the bubble packet transmission port. Bubble packet transmission port information is received by reception, for example.

The reply packet transmitter 24 transmits a reply packet to the bubble packet transmission port in the first communication control device 3. The position of the bubble packet transmission port is indicated by the bubble packet transmission port information received by the bubble packet transmission port receiving unit 23. This reply packet is transmitted using different N ports (N is an integer of 2 or more) of the second communication control device 4. The N ports are ports newly assigned in the second communication control device 4 when a reply packet is transmitted. Here, the value of N is the number (assumed to be α) of ports that can be allocated from the reference port to the port (bubble packet transmission target port) from which the bubble packet is transmitted in the second communication control device 4. . In other words, when the reply packet is transmitted, unless the bubble packet transmission target port is already used by another device, the reply packet using the bubble packet transmission target port is transmitted by transmitting α reply packets. Transmission is possible. This reply packet is transmitted by, for example, UDP. This reply packet may contain some information or no information.

  The reply packet accepting unit 25 accepts the reply packet transmitted from the first information processing apparatus 1. This re-reply packet is transmitted to the port of the second communication control device 4 used for transmission of the reply packet and received by the second information processing device 2. Depending on the type of NAT used in the first communication control device 3 and the second communication control device 4, the first information processing device 1 and the second information processing device 1 when the first information processing device 1 receives the reply packet. The first information processing apparatus 1 and the second information processing apparatus can be established only when the second information processing apparatus 2 accepts the re-reply packet. Communication between the two may be established.

  The port width detection packet transmitter 26 transmits a port width detection packet for detecting the port width in the second communication control device 4 to the server 6 via the second communication control device 4. This port width detection packet may contain some information or no information.

The first communication control device 3 controls communication of the first information processing device 1, and uses a so-called nut (NAT), the local side (first information processing device 1 side), and the global side. Controls communication with (communication line 5 side). This NAT includes F NAT, R NAT, PR
There are NAT, Sa NAT, AS NAT, Sc NAT, Sd NAT, Se NAT, and PS NAT.

  Further, the second communication control device 4 controls communication of the second information processing device 2, and uses the NAT similarly to the first communication control device 3. As will be described later, in the communication system according to the present embodiment, the first information processing apparatus 1 and the first information processing apparatus 1 are connected to the first communication control apparatus 3 and the second communication control apparatus 4 in all combinations of NATs. Communication between the two information processing apparatuses 2 can be established. In the first communication control device 3 and the second communication control device 4, the port assignment is performed so that the port number increases or decreases for each predetermined port width. In the following description, a case where the port number is assigned so as to increase will be described.

  FIG. 4 is a block diagram showing the configuration of the server 6. 4, the server 6 includes a communication unit 61, a reference port detection unit 62, a reference port transmission unit 63, a port width detection unit 64, a bubble packet transmission port detection unit 65, and a retransmission instruction transmission unit 66. , Bubble packet transmission port transmission unit 67 and port width transmission unit 68.

  The communication unit 61 communicates with each unit of the server 6 such as the reference port detection unit 62 and the first information processing apparatus 1 and the second information processing apparatus 2.

  The reference port detector 62 receives the reference port detection packet and detects the position of the reference port based on the reference port detection packet. The reception of the reference port detection packet is performed by reception, for example. The reference port detection packet is transmitted from the second information processing device 2 via the second communication control device 4.

  The reference port transmission unit 63 transmits reference port information to the first information processing apparatus 1. This reference port information indicates the position of the reference port by, for example, the port number of the reference port.

The port width detection unit 64 detects the port width in the first communication control device 3. This detection is performed by receiving a port width detection packet transmitted from the first information processing apparatus 1. The port width detection unit 64 detects the port width in the second communication control device 4. This detection is performed by receiving a port width detection packet transmitted from the second information processing apparatus 2. In addition, you may provide the 1st port detection part which detects the port width in the 1st communication control apparatus 3, and the 2nd port detection part which detects the port width in the 2nd communication control apparatus 4. The port width detection unit 64 realizes them by one. That is, in the port width detection unit 64, the part that detects the port width in the first communication control device 3 becomes the first port detection unit, and the part that detects the port width in the second communication control device 4 It becomes a second port detection unit.

  Bubble packet transmission port detector 65 detects the position of the bubble packet transmission port in first communication control device 3. This detection is performed by receiving a port detection packet transmitted from the first information processing apparatus 1 via the first communication control apparatus 3. The reception of the port detection packet is performed by reception, for example. Specifically, bubble packet transmission port detection unit 65 accepts port detection packets transmitted before and after transmission of bubble packets. Then, it is determined whether the two ports in the first communication control device 3 used for transmitting the port detection packet and the bubble packet transmission port are continuous. As a result of the determination, if these ports are continuous, the position of the port sandwiched between the two ports in the first communication control device 3 used for transmission of the port detection packet is set to the bubble packet transmission port. Detect as position. Here, “continuous” means that the two ports and the bubble packet transmission port are arranged at an interval of the port width of the first communication control device 3. Note that the interval between the two ports of the first communication control device 3 used for transmission of the port detection packet is twice the port width of the first communication control device 3 detected by the port width detection unit 64. In some cases, it can be determined that they are continuous. On the other hand, when the two ports in the first communication control device 3 used for transmitting the port detection packet and the bubble packet transmission port are not continuous, the bubble packet transmission port cannot be detected.

  The retransmission instruction transmission unit 66 transmits a retransmission instruction to the first information processing apparatus 1 when the bubble packet transmission port detection unit 65 cannot detect the position of the bubble packet transmission port. Here, the retransmission instruction is an instruction to retransmit the bubble packet and the port detection packet. Bubble packet transmission port detection unit 65 detects the position of the bubble packet transmission port using the port detection packet transmitted again in response to the transmission of the retransmission instruction. The retransmission instruction is transmitted until the bubble packet transmission port detecting unit 65 can detect the position of the bubble packet transmission port, or a predetermined upper limit number of times (for example, 10 times) or a predetermined time (for example, , 30 seconds, etc.).

  Bubble packet transmission port transmitter 67 transmits bubble packet transmission port information to second information processing apparatus 2. The position of the bubble packet transmission port indicated by the bubble packet transmission port information is that detected by the bubble packet transmission port detector 65.

  The port width transmission unit 68 transmits port width information to the first information processing apparatus 1. Here, the port width information is information indicating the port width in the second communication control device 4 detected by the port width detection unit 64.

  Next, the operation of the communication system according to the present embodiment will be described. In particular, a communication method until the first information processing apparatus 1 and the second information processing apparatus 2 start communication will be described using the flowchart of FIG.

(Step S101) The reference port detection packet is transmitted from the second information processing device 2 to the server 6, and the position of the reference port is detected based on the reference port detection packet. Then, reference port information indicating the position of the reference port is transmitted from the server 6 to the first information processing apparatus 1. Detailed processing in step S101 will be described later.

  (Step S102) The first information processing apparatus 1 transmits a bubble packet to the second communication control apparatus 4 based on the reference port information. In addition, a port detection packet used for detecting the position of the bubble packet transmission port is transmitted to the server 6. Detailed processing in step S102 will be described later.

  (Step S103) The bubble packet transmission port detector 65 of the server 6 determines whether the position of the bubble packet transmission port can be detected based on the port detection packet received in step S102. If it can be detected, the process proceeds to step S104. If it cannot be detected, the retransmission instruction transmitting unit 66 transmits a retransmission instruction to the first information processing apparatus 1, and the process returns to step S102. The retransmission instruction is received by the retransmission instruction receiving unit 16 of the first information processing apparatus 1.

  (Step S104) The server 6 detects the position of the bubble packet transmission port, and transmits bubble packet transmission port information indicating the position to the second information processing apparatus 2. The second information processing device 2 transmits a reply packet to the first communication control device 3 based on the bubble packet transmission port information. Detailed processing in step S104 will be described later.

  (Step S105) The reply packet accepting unit 17 of the first information processing apparatus 1 determines whether or not a reply packet has been accepted. If a reply packet is accepted, the process proceeds to step S106. If not, the process returns to step S101, and the processing from step S101 is repeated again.

  (Step S <b> 106) The reply packet transmission unit 18 of the first information processing apparatus 1 transmits the reply packet to the second communication control apparatus 4.

  (Step S107) The re-response packet receiving unit 25 of the second information processing apparatus 2 determines whether a re-response packet has been received. When a re-reply packet is received, the packet is transmitted to any port of the first communication control device 3 used for transmitting the re-reply packet, thereby the first information processing apparatus 1 and Communication with the second information processing apparatus 2 not via the server 6 can be established, and the communication establishment process is terminated. On the other hand, if the re-reply packet is not accepted, communication cannot be established, so the process returns to step S101 and the processes from step S101 are repeated again.

  Next, the process of step S101 in the flowchart of FIG. 5 will be described with reference to FIG. FIG. 6 is a diagram for explaining exchange and processing of information among the transmission side, the server, and the reception side. Here, the transmission side is a concept including the first information processing apparatus 1 and the first communication control apparatus 3. The receiving side is a concept including the second information processing device 2 and the second communication control device 4.

  (Step S <b> 201) The server 6 transmits a transmission request for a reference port detection packet to the second information processing apparatus 2.

(Step S <b> 202) Upon receiving the reference port detection packet transmission request transmitted from the server 6, the reference port detection packet transmission unit 22 of the second information processing apparatus 2 transmits the reference port detection packet to the server 6. To do. Note that the reference port detection packet transmitter 22 transmits the reference port detection packet using the port most recently assigned in the second communication control device 4. For example, the reference port detection packet is transmitted using the newly assigned port in the second information processing apparatus 2.

  (Step S203) The reference port detection unit 62 of the server 6 receives the reference port detection packet transmitted from the second information processing apparatus 2. Then, the reference port detection unit 62 detects the position of the reference port by referring to the port number of the reference port included in the header of the reference port detection packet.

  (Step S <b> 204) The reference port transmission unit 63 transmits reference port information, which is information indicating the position of the reference port detected by the reference port detection unit 62, to the first information processing apparatus 1. The reference port information is received by the reference port receiving unit 12 in the first information processing apparatus 1.

  (Step S <b> 205) The server 6 transmits address information indicating the IP address of the second communication control device 4 to the first information processing device 1. The address information is received by the communication unit 11 and passed to the bubble packet transmission unit 13.

  (Step S206) The port width detection packet transmitter 15 of the first information processing apparatus 1 transmits the port width detection packet to the server 6. Here, in this transmission, the ports of the first communication control device 3 through which a plurality of port width detection packets pass are made different. For example, the port width detection packet is transmitted from a plurality of ports having different port numbers in the first information processing apparatus 1. FIG. 7 is a diagram for explaining transmission of a port width detection packet. The port width detection packet transmitter 15 sequentially transmits port width detection packets to the port P200 of the server 6 from different ports P205 to P208. Then, in the first communication control device 3, those packets pass through different ports P201 to P204, respectively. In FIG. 7, it is assumed that packets are transmitted in the order of ports P205 to P208. Further, it is assumed that the first information processing apparatus 1 does not use the ports P205 to P208 for communication with the server 6 before transmitting the port width detection packet.

  (Step S207) The port width detection unit 64 of the server 6 receives the port width detection packet transmitted from the first information processing apparatus 1, and detects the port width based on the port width detection packet. A method for detecting the port width will be described. The port width detection unit 64 can detect the ports P201 to P204 of the first communication control device 3 used for transmitting each port width detection packet by receiving the port width detection packet. For example, when the port interval between the port P202 and the port P201 is 12, the port interval between the port P203 and the port P202 is 6, and the port interval between the port P204 and the port P203 is 18, A small port interval “6” may be detected as the port width. On the other hand, the greatest common divisor of these port intervals may be detected as the port width. For example, when the port interval between the port P202 and the port P201 is 12, the port interval between the port P203 and the port P202 is 6, and the port interval between the port P204 and the port P203 is 9, The common divisor “3” may be detected as the port width. The method for detecting the port width is not limited to these, and the port width may be detected by other methods. Further, the number of port width detection packets transmitted when detecting the port width is not limited to four, and can be arbitrarily set within a range in which the port width can be detected.

  (Step S208) The port width detection packet transmitter 26 of the second information processing apparatus 2 transmits the port width detection packet to the server 6. Here, the transmission of the port width detection packet is performed in the same manner as in step S206.

  (Step S209) The port width detection unit 64 of the server 6 receives the port width detection packet transmitted from the second information processing apparatus 2, and based on the port width detection packet, the second communication control apparatus 4 Detect the port width at. The method for detecting the port width is the same as that in step S207, and the description thereof is omitted. Note that the port width detection process in step S209 requires less strictness than the port width detection in step S207. That is, a multiple of the actual port width in the second communication control device 4 may be detected as the port width. The port width detected in this step S209 is a port interval from the reference port by a multiple of the port width detected in this step S209 (if the port number assignment is in the increasing direction, the direction in which the port number increases) B) used to determine a remote port as a bubble packet transmission target port. As a result, even if the port width detected in this step is a multiple of the actual port width, the bubble packet transmission target port determined in this way is assigned after several port assignments from the reference port. This is because the port can be used as a bubble packet transmission target port. Therefore, in the port width detection in steps S208 and S209, the port width may be detected by transmitting a small number of port width detection packets.

  (Step S210) The port width transmission unit 68 of the server 6 transmits port width information indicating the port width detected in step S209 to the first information processing apparatus 1.

  In FIG. 6, the transmission of the receiving side address (step S205) may be performed at any time, for example, transmission of reference port information (step S204) or transmission request for reference port detection packet (step S201). ) May be done before. Further, the transmission of the port width detection packet (step S208) to the transmission of the port width information (step S210) may be performed before the processing of the transmission of the port width detection packet (step S206). As described above, there is a certain degree of arbitraryness with respect to the processing order of FIG.

  Next, the process of step S102 in the flowchart of FIG. 5 will be described with reference to FIG. FIG. 8 is a diagram for explaining the exchange and processing of information among the transmission side, the server, and the reception side.

  (Step S301) The detection packet transmitter 14 of the first information processing apparatus 1 transmits the port detection packet to the server 6 via the first communication control apparatus 3. In this transmission, it is assumed that the packet is transmitted so that the port detection packet passes through the port assigned the latest in the first communication control device 3. This is because the position of the bubble packet transmission port can be detected appropriately. For example, the detection packet transmission unit 14 uses the port of the first information processing apparatus 1 that has not been used in the communication between the first information processing apparatus 1 and the server 6 to transmit a port detection packet. Send. The port detection packet transmitted in this way is received by the bubble packet transmission port detection unit 65 of the server 6. The bubble packet transmission port detection unit 65 detects the position of the port in the first communication control device 3 used in the transmission of the port detection packet by referring to the header of the port detection packet.

  (Step S <b> 302) The bubble packet transmitter 13 of the first information processing apparatus 1 transmits a bubble packet to the second communication control apparatus 4. The bubble packet is transmitted from the reference port to the port assigned after the port assignment a predetermined number of times (α) in the second communication control device 4.

(Step S <b> 303) The detection packet transmitter 14 of the first information processing device 1 transmits the port detection packet to the server 6 via the first communication control device 3. In this transmission, it is assumed that the packet is transmitted so that the port detection packet passes through the port assigned the latest in the first communication control device 3. For example, the detection packet transmission unit 14 has not been used so far for communication between the first information processing apparatus 1 and the server 6, transmission of a port detection packet in step S301, and transmission of a bubble packet. A port detection packet is transmitted using the port of one information processing apparatus 1. The port detection packet transmitted in this way is received by the bubble packet transmission port detection unit 65 of the server 6. The bubble packet transmission port detection unit 65 detects the position of the port in the first communication control device 3 used in the transmission of the port detection packet by referring to the header of the port detection packet.

  (Step S304) The bubble packet transmission port detection unit 65 of the server 6 determines the position of the port of the first communication control device 3 used for transmission of the two port detection packets in steps S301 and S303, and bubble packet transmission. Determine if the port is continuous.

  Next, the process of step S104 in the flowchart of FIG. 5 will be described with reference to FIG. FIG. 9 is a diagram for explaining the exchange and processing of information among the transmission side, the server, and the reception side.

  (Step S401) The bubble packet transmission port detector 65 of the server 6 detects the position of the bubble packet transmission port.

  (Step S <b> 402) The bubble packet transmission port transmission unit 67 of the server 6 transmits bubble packet transmission port information to the second information processing apparatus 2. The bubble packet transmission port information is received by the bubble packet transmission port reception unit 23 of the second information processing apparatus 2.

  (Step S <b> 403) The server 6 transmits address information indicating the IP address of the first communication control device 3 to the second information processing device 2. The address information is received by the communication unit 21 and passed to the reply packet transmission unit 24.

  (Step S404) The reply packet transmitter 24 of the second information processing apparatus 2 transmits a reply packet to the first first communication control apparatus 3 specified by the address information received in Step S403. This reply packet is transmitted to the bubble packet transmission port indicated by the bubble packet transmission port information received by the bubble packet transmission port reception unit 23.

  In FIG. 9, the order of transmission of bubble packet transmission port information (step S402) and transmission of the transmission side address (step S403) is not limited.

  Next, the operation of the communication system according to the present embodiment will be described using a specific example. In this specific example, the IP addresses of the first communication control device 3, the second communication control device 4, and the server 6 (for the first and second communication control devices 3 and 4, the addresses on the communication line 5 side) are Suppose that they are as follows.

First communication control device 3: 202.132.10
Second communication control device 4: 131.206.10.240
Server 6: 155.32.10.10
In the following specific example, the case where the first communication control device 3 and the second communication control device 4 in the specific example 1 use PS NAT will be described. In the second specific example, a case where the first communication control device 3 uses Sd NAT and the second communication control device 4 uses PS NAT will be described. Further, in the third specific example, a case where the first communication control device 3 uses Sd NAT and the second communication control device 4 uses AS NAT will be described.

(Specific example 1)
10 to 13 are diagrams for explaining the first specific example. In this specific example 1, a connection request is made from the first information processing apparatus 1. In FIG. 10, the first information processing apparatus 1 knows in advance the IP address “155.32.10.10” of the server 6, and the server 6 has the device ID of the first information processing apparatus 1. “12345678890123456” is transmitted. Here, as the device ID, for example, a GUID (Global Unique ID) such as a MAC address or an EUI64-based address can be used. The transmission of the device ID is performed from the port P1 of the first information processing apparatus 1 to the port P3 of the server 6 via the port P2 assigned by the first communication control apparatus 3. By this transmission, the server 6 causes the device ID of the first information processing device 1, the IP address “202.132.10.6” of the first communication control device 3, and the port in the first communication control device 3. It is possible to know the port number “10034” of P2. These pieces of information are held in the server 6.

  Next, the first information processing apparatus 1 transmits a device ID “98776543210123456” of the second information processing apparatus 2 that requests connection to the server 6, thereby requesting connection to the second information processing apparatus 2. Do. Then, the server 6 receives the connection request and determines whether or not the second information processing apparatus 2 has already accessed the server 6. The access by the second information processing apparatus 2 is also performed by transmitting the device ID of the second information processing apparatus 2 in the same manner as the first information processing apparatus 1 described above. Therefore, when the second information processing device 2 is accessing the server 6, the server 6 has the device ID “9876543210123456” of the second information processing device 2 and the IP address of the second communication control device 4. Know "131.206.10.240" and the port number "23495" of the port P5 of the second communication control device 4 used for transmission / reception of information between the second information processing device 2 and the server 6 And will hold them. If the second information processing apparatus 2 has already accessed the server 6, the process related to acceptance of the reference port information (step S101) is started. On the other hand, when the second information processing apparatus 2 is not accessing the server 6, the connection request from the first information processing apparatus 1 results in an error, and the first information processing apparatus 1 and the second information processing Communication between the devices 2 cannot be established.

  In the processing related to reception of the reference port information, the server 6 makes a transmission request to the second information processing device 2 to transmit the reference port detection packet via the port P5 of the second communication control device 4 ( Step S201). Then, the transmission request is accepted by the reference port detection packet transmitter 22 of the second information processing apparatus 2. Then, the reference port detection packet transmission unit 22 uses the newly assigned port P8, which is different from the port P6 used in the communication with the server 6 so far, in the second information processing apparatus 2 from the second port P8. A reference port detection packet is transmitted via the communication control device 4 (step S202). In the transmission of the reference port detection packet, it is assumed that the port P7 (port number “23500”) is newly assigned in the second communication control device 4. The reference port detection packet is received by the reference port detection unit 62 of the server 6. Then, the port number “23500” is detected as the position of the reference port P7 (step S203).

The reference port transmission unit 63 receives the port number “23500” from the reference port detection unit 62, configures reference port information including the port number “23500” of the reference port P7, and sets the reference port information as the first information. It transmits to the processing apparatus 1 (step S204). This transmission is performed via the port P2 in the first communication control device 3. The reference port accepting unit 12 of the first information processing apparatus 1 accepts the reference port information via the communication unit 11 and uses the port number “23500” of the reference port P7 included in the reference port information as a bubble packet transmitting unit. Pass to 13.

  Further, the server 6 transmits address information indicating the IP address “131.206.10.240” of the second communication control device 4 to the first information processing device 1 (step S205). The address information is received by the communication unit 11 and passed to the bubble packet transmission unit 13. In this way, the bubble packet transmitting unit 13 can know the IP address “131.206.10.240” of the second communication control device 4.

  When detecting that the communication unit 11 has received the address information, the port width detection packet transmitter 15 transmits a plurality of port width detection packets as shown in FIG. 7 (step S206). In FIG. 10, transmission of the port width detection packet is not explicitly shown. The port width detection packet is received by the port width detection unit 64 of the server 6, and the port width is detected. In this case, it is assumed that the port width is detected as “1” (step S207). The detected port width is passed to bubble packet transmission port detector 65.

  Further, the port width detection packet transmitter 26 transmits a plurality of port width detection packets in response to an instruction from the port width detector 64 of the server 6 (step S208). In FIG. 10, the transmission of the port width detection packet is not clearly shown. The port width detection packet is received by the port width detection unit 64 of the server 6, and the port width is detected. In this case, it is assumed that the port width is detected as “1” (step S209). Thereafter, the port width transmission unit 68 transmits the detected port width “1” to the first information processing apparatus 1 (step S210). The port width “1” is received by the port width receiving unit 19 and passed to the bubble packet transmitting unit 13.

  Bubble packet transmitter 13 passes an instruction to transmit a port detection packet to detection packet transmitter 14 before transmitting the bubble packet. Then, the detection packet transmission unit 14 has not been used for communication with the server 6 so far, and is a newly assigned port (that is, a port newly assigned by the first information processing apparatus 1). A port detection packet is transmitted to port P15 of server 6 using P9 (step S301). The port P15 is assumed to be a port instructed from the server 6. The port detection packet is transmitted using the newly assigned port P12 (port number “10040”) in the first communication control device 3. The bubble packet transmission port detection unit 65 of the server 6 receives this port detection packet and detects the port number “10040” of the port P12 of the first communication control device 3. Bubble packet transmission port detector 65 holds port number “10040” of port P12.

After transmitting the port detection packet, the detection packet transmission unit 14 notifies the bubble packet transmission unit 13 that the port detection packet has been transmitted. Then, the bubble packet transmitting unit 13 has not been used for communication with the server 6 so far, and uses the port P10 which is a newly allocated port, and the IP address “131.206.10.240” The bubble packet is transmitted to the second communication control device 4 (step S302). In the transmission of the bubble packet, the port number “23500” of the reference port P7 received from the reference port receiving unit 12 and a predetermined multiple of the port width “1” received by the port width receiving unit 19, that is, 50 times (ie, , Α = 50), it is assumed that a bubble packet is transmitted to the port P17 of the port number “23550” separated by a distance. Also, it is assumed that the bubble packet is transmitted using the port P13 (port number “10041”) of the first communication control device 3. The bubble packet transmitting unit 13 transmits “α = 50” to the server 6 after transmitting the bubble packet. Then, the server 6 transmits a message to that effect to the second information processing apparatus 2. Then, the reply packet transmitter 24 accepts that “α = 50”.

  Bubble packet transmitter 13 passes an instruction to transmit port detection packet to detection packet transmitter 14 after transmitting the bubble packet. Then, the detection packet transmitting unit 14 has not been used for communication with the server 6 until then, and uses the port P11 which is a newly assigned port to the port 16 of the server 6 for the port detection packet. Is transmitted (step S303). The port detection packet is transmitted using the newly assigned port P14 (port number “10042”) in the first communication control device 3. As described above, the bubble packet and the port detection packet are transmitted using different ports in the first communication control device 3.

  The bubble packet transmission port detector 65 of the server 6 receives this port detection packet and detects the port number “10042” of the port P14 of the first communication control device 3. The bubble packet transmission port detector 65 detects that the difference between the held port number “10040” of the port P12 and the detected port number “10042” of the port P14 is “2” in step S207. Since it is twice the port width “1”, the ports P12 and P14 and the bubble packet transmission port P13 in the first communication control device 3 used for transmitting the two port detection packets are continuous. Is determined (step S304). As a result, it is determined that the position of the bubble packet transmission port can be detected (step S103), and the bubble packet transmission port detector 65 sets the port number “10041” in the middle of the ports P12 and P14 as the position of the bubble packet transmission port. Is detected (step S401).

  The bubble packet transmission port transmission unit 67 configures bubble packet transmission port information including the port number “10041” of the bubble packet transmission port P13 detected by the bubble packet transmission port detection unit 65, and the bubble packet transmission port information is The data is transmitted to the second information processing device 2 via the port P5 of the second communication control device 4 (step S402). The bubble packet transmission port information is received by the bubble packet transmission port reception unit 23 of the second information processing apparatus 2. Then, the port number “10041” of the bubble packet transmission port P13 included in the bubble packet transmission port information is passed to the reply packet transmission unit 24.

  The server 6 transmits address information indicating the IP address “202.132.10.6” of the first communication control device 3 to the second information processing device 2 (step S403). The address information is received by the communication unit 21 and passed to the reply packet transmission unit 24. In this way, the reply packet transmitter 24 can know the IP address “202.132.16” of the first communication control device 3.

The reply packet transmission unit 24 transmits 50 reply packets to the bubble packet transmission port P13 having the port number “10041” in the first communication control device 3 having the IP address “202.132.10.6”. (Step S404). The number of 50 corresponds to the value of α received from the server 6 by the reply packet transmission unit 24. The reply packet transmitter 24 newly allocates the 50 reply packets in the second information processing apparatus 2 (that is, 50 ports P20 that have not been used in communication with the server 6 or the like so far). Transmit using ~ P21. Therefore, the reply packet is also transmitted using the 50 newly assigned ports P18 to P19 in the second communication control device 4 (see FIG. 12). In the second communication control unit 4, the latest port assigned at the time when the reference port detection packet is transmitted is the port P7, and the bubble packet is sent to the port P17 which is separated from the port P7 by the port number 50. Since the port P17 is already used by a device other than the second information processing apparatus 2 when the reply packet is transmitted, any one of the 50 reply ports is a bubble packet transmission target port. It is transmitted to the first communication control device 3 using P17. Since the first communication control device 3 uses PS NAT and the transmission history of transmitting bubble packets to the bubble packet transmission target port P17 remains in the first communication control device 3, Only reply packets transmitted using the bubble packet transmission target port P17 can be accepted. The reply packet is received by the reply packet receiving unit 17 via the port P10 of the first information processing apparatus 1.

  Here, in this specific example 1, the communication between the first information processing apparatus 1 and the second information processing apparatus 2 is established by accepting this reply packet. The transmission of will also be described.

  The reply packet transmitter 24 of the second information processing device 2 informs the server 6 via the port P5 of the second communication control device 4 that the reply packet has been transmitted after the 50 reply packets have been transmitted. Send. Then, the server 6 receives that the transmission of the reply packet has been completed, and transmits that fact to the first information processing apparatus 1 via the port P2 of the first communication control apparatus 3. When the reply packet accepting unit 17 of the first information processing apparatus 1 accepts that fact, the reply packet accepting unit 17 has already accepted the reply packet. Therefore, the second communication control apparatus to which the reply packet included in the header of the reply packet 17 is transmitted. 4 is acquired, and the port number and an instruction to transmit the reply packet are passed to the reply packet transmitter 18 (step S105). If the reply packet accepting unit 17 has not accepted a reply packet, the reply packet accepting unit 17 transmits to the server 6 that no reply packet has been accepted. As a result, the server 6 transmits a reference port detection packet transmission request to the second information processing apparatus 2 again, and establishes a connection between the first information processing apparatus 1 and the second information processing apparatus 2. Therefore, the process for this is performed again (steps S101 to S104).

  The reply packet transmitting unit 18 transmits the reply packet to the port P17 having the port number “23550” received from the reply packet receiving unit 17 (step S106). The re-reply packet is transmitted to the second information processing device 2 using the port P13 of the first communication control device 3 and the port P17 of the second communication control device 4, and the second information processing device 2 Re-reply packet accepting unit 25 accepts it.

  Also, the reply packet transmitter 18 transmits to the server 6 via the port P2 of the first communication control device 3 that the reply packet has been transmitted after the reply packet is transmitted. Then, the server 6 receives that the transmission of the reply packet has been completed, and transmits that fact to the second information processing device 2 via the port P5 of the second communication control device 4. The reply packet accepting unit 25 of the second information processing apparatus 2 accepts that fact. In this case, since the reply packet accepting unit 25 has already accepted the reply packet, the process for establishing communication between the first information processing apparatus 1 and the second information processing apparatus 2 ends. (Step S107). If the reply packet accepting unit 25 does not accept the reply packet, the reply packet accepting unit 25 transmits to the server 6 that the reply packet is not accepted. As a result, the server 6 transmits a reference port detection packet transmission request to the second information processing apparatus 2 again, and establishes a connection between the first information processing apparatus 1 and the second information processing apparatus 2. Therefore, the process for this is performed again (steps S101 to S106).

  Thereafter, peer-to-peer UDP communication between the first information processing apparatus 1 and the second information processing apparatus 2 without using the server 6 is performed by the port P13 of the first communication control apparatus 3 and the first information processing apparatus 2. This is performed via the port P17 of the second communication control device 4.

  In the specific example 1, the case where the port detection packet and the bubble packet are transmitted using consecutive ports in the first communication control device 3 has been described. For example, the port number of the port P12 is “ 10040 ”and when the port number of the port P14 is“ 10043 ”, the port detection packet and the bubble packet are not transmitted using consecutive ports in the first communication control device 3 The transmission of the bubble packet and the port detection packet is repeated until the port of the first communication control device 3 used for transmitting the port detection packet and the bubble packet transmission port become a continuous port. (Steps S102 and S103). Here, the reason why the port of the first communication control device 3 used for transmission of the port detection packet and the bubble packet transmission port are not continuous ports in the first communication control device 3 is as follows. A device (not shown) other than the first information processing device 1 is connected to the local side of the communication control device 3, and from the transmission of the port detection packet to the transmission of the bubble packet, or from the transmission of the bubble packet to the port detection There is a case where the port of the first communication control device 3 is assigned to the device before the transmission of the packet for use.

  In the first specific example, the apparatus such as the transmission of the device ID from the first information processing apparatus 1, the transmission of the apparatus ID from the second information processing apparatus 2, or the transmission of address information from the server 6 is performed. Information transmission / reception between them is performed by a control unit (not shown) in the first information processing apparatus 1 or the like. The same applies to the following specific examples.

  In FIG. 11, the port detection packet destination ports P15 and P16 may be the same port or the same as the port P3.

  In FIG. 11, when the first communication control device 3 is PS NAT, the port P9, the port P10, and the port P11 may be the same port. However, even in this case, the port P9 (= ports P10 and P11) is a port newly assigned when the first port detection packet is transmitted. Port P15 and port P16 are different.

(Specific example 2)
In specific example 2, a case will be described in which the first communication control device 3 uses Sd NAT and the second communication control device 4 uses PS NAT.

  Even in this case, the process until the reply packet is transmitted from the second information processing apparatus 2 to the first communication control apparatus 3 is the same as in the first specific example, and the description thereof is omitted. Also in this specific example 2, it is assumed that processing such as bubble packet transmission is performed using the same port number as in specific example 1. In the case of this specific example 2, since the first communication control device 3 uses Sd NAT, that is, the reception filter full uses the NAT of the No filter, 50 replies transmitted from the second information processing device 2 are used. All the packets are received by the reply packet receiving unit 17 via the port P10 of the first information processing apparatus 1.

The reply packet accepting unit 17 acquires the port number of the second communication control device 4 used for sending the reply packet from each reply packet, and passes the port number to the re-reply packet transmitting unit 18. The re-reply packet transmitter 18 receives the port number and transmits a re-reply packet to each port number received by the second communication control device 4 (see FIG. 14). The Sd NAT used in the first communication control device 3 uses the bubble packet transmission port P13 in the first communication control device 3 to transmit to the second communication control device 4 because the transmission port assignment rule is Port Sensitive. The transmission can be performed only when a packet is transmitted to the bubble packet transmission target port P17 of the second communication control device 4. Therefore, as shown in FIG. 14, the re-reply port transmitted to other than the bubble packet transmission target port P <b> 17 is transmitted using the ports P <b> 22 to P <b> 23 newly assigned by the first communication control device 3. Since the second communication control device 4 uses PS NAT, it cannot accept re-reply packets from other than the port of the first communication control device 3 that sent the reply packet. Therefore, the reply packet accepting unit 25 of the second information processing apparatus 2 can accept only the reply packet transmitted to the bubble packet transmission target port P17. In this way, communication between the first information processing apparatus 1 and the second information processing apparatus 2 is established.

  Here, the significance of transmitting a re-reply packet from the first information processing apparatus 1 to the second communication control apparatus 4 will be described. Even if the first information processing apparatus 1 receives the reply packet, the communication between the first information processing apparatus 1 and the second information processing apparatus 2 is reliably performed via the port through which the reply packet has passed. It is not established. This is because communication can be established only for the path of the reply packet transmitted via the bubble packet transmission target port P17 among the received reply packets as in the above specific example 2. The following situation is also conceivable. In the specific example 2, the reply packet is transmitted without using the bubble packet transmission target port P17 (for example, when the bubble packet transmission target port P17 is used by another device before the transmission of the reply packet). However, the first information processing apparatus 1 can accept all reply packets. However, even if the first information processing apparatus 1 transmits a re-reply packet for the reply packet, the re-reply packet is not accepted by the second information processing apparatus 2 and communication is not established. As described above, the position of the port used in peer-to-peer communication that can be established between the first information processing apparatus 1 and the second information processing apparatus 2 is confirmed by transmitting the reply packet. It is also possible to confirm whether communication between the first information processing apparatus 1 and the second information processing apparatus 2 can be established.

(Specific example 3)
In specific example 3, a case where the first communication control device 3 uses Sd NAT and the second communication control device 4 uses AS NAT will be described. In this specific example 3, a special case will be described in which communication that does not use the bubble packet transmission target port is established between the first information processing apparatus 1 and the second information processing apparatus 2.

  FIG. 15 is a diagram for explaining transmission of a reply packet from the second information processing apparatus 2. In the transmission of the reply packet, the bubble packet transmission target port P17 is already used by another device. Therefore, the reply packet does not include the bubble packet transmission target port P17. The ports P24 to P25 in the second communication control device 4 do not include the reply packet. Is sent via. Since the first communication control device 3 uses the NAT of the No filter, the first information processing device 1 accepts all the reply packets.

  FIG. 16 is a diagram for explaining the transmission of a re-reply packet. As shown in FIG. 16, it is assumed that the reply packet transmission unit 18 transmits a reply packet to the ports P24 to P25 of the second communication control device 4. In this case, since the first communication control device 3 uses Sd NAT, the reply packet is sent to the ports P24 to P25 of the second communication control device 4 using the newly assigned ports P26 to P27. Sent to. Since the second communication control device 4 uses AS NAT, that is, the NAT of the Address Sensitive filter, these re-reply packets are accepted by the second communication control device 4, and the second information processing device 2 Passed to ports P20 to P21. Thereafter, the second information processing apparatus 2 selects any one of the re-reply packets (for example, the first packet that arrives first), and the route (for example, the first re-reply packet) is transmitted. Communication with the first information processing apparatus 1 can be performed via the port P26 of the communication control apparatus 3 and the port P24 of the second communication control apparatus 4.

  The situation of Specific Example 3 is appropriate when the first communication control device 3 uses a No filter or AS filter, and the second communication control device 4 uses a No filter or AS filter. Therefore, in these cases, the connection between the first information processing apparatus 1 and the second information processing apparatus 2 can be reliably realized if the position of the bubble packet transmission port P13 can be accurately grasped. It becomes.

  Further, when the NAT used in the first communication control device 3 is a No filter, the first information processing device 1 can accept all reply packets. Even when the NAT used in the first communication control device 3 is an AS filter, since the bubble packet is transmitted to the second communication control device 4, all reply packets are sent to the first communication control device 3. The information processing apparatus 1 can accept the information. When the NAT port assignment rule used in the first communication control device 3 is Cone or Address Sensitive, the first information processing device 1 transmits a bubble packet to the received reply packet. A re-reply packet can be transmitted using the port P13. Therefore, if the NAT filter used in the first communication control device 3 is a No filter or an AS filter and the port assignment rule is Cone or Address Sensitive, the NAT type of the second communication control device 4 Regardless, if the position of the bubble packet transmission port P13 can be accurately grasped, the connection between the first information processing apparatus 1 and the second information processing apparatus 2 can be realized with certainty.

  From the above, as shown in FIG. 17, in the communication system according to the present embodiment, communication is established regardless of the NAT type used in the first communication control device 3 and the second communication control device 4. be able to. As a result, the determination between the first information processing device 1 and the second information processing device 2 can be performed without making a determination regarding the type of NAT used in the first communication control device 3 and the second communication control device 4. Communication can be established. In particular, when the combination of these NATs is a specific one, even if the reply packet is transmitted without using the bubble packet transmission target port, the position of the bubble packet transmission port can be accurately detected. Communication between the first information processing apparatus 1 and the second information processing apparatus 2 can be established (in the case of “◎” in FIG. 17). In other cases (in the case of “◯” in FIG. 17), even if the position of the bubble packet transmission port can be accurately detected, if a reply packet is not transmitted using the bubble packet transmission target port, Communication cannot be established. Therefore, at that time, the process for establishing communication is repeated until the reply packet can be transmitted using the bubble packet transmission target port. As shown in FIG. 17, the first communication control device 3 and the second communication control device 4 may be Open NAT (not using NAT).

(Embodiment 2)
A communication system according to Embodiment 2 of the present invention will be described with reference to the drawings. The communication system according to the present embodiment reduces the processing load on the server by performing bubble packet transmission port detection, port width detection, and the like not in the server but in the information processing apparatus.

  The configuration of the communication system according to the present embodiment is different from the first information processing device 1, the second information processing device 2, and the server 6 in that the first information processing device 10, the second information processing device 20, and the like. Except for the provision of the server 60, it is the same as FIG.

FIG. 18 is a block diagram showing a configuration of the first information processing apparatus 10 according to the present embodiment. 18, the first information processing apparatus 10 includes a communication unit 11, a reference port reception unit 12, a bubble packet transmission unit 13, a detection packet transmission unit 14, a port width detection packet transmission unit 15, Reply packet accepting unit 17, re-reply packet sending unit 18, port width accepting unit 19, detection port information accepting unit 71, bubble packet sending port detecting unit 72, bubble packet sending port sending unit 73, port A width detection port information receiving unit 74 and a port width detection unit 75 are provided. The configuration and operation other than the detection port information reception unit 71, bubble packet transmission port detection unit 72, bubble packet transmission port transmission unit 73, port width detection port information reception unit 74, and port width detection unit 75 are the same as the port width. Except for accepting the port width information transmitted from the second information processing apparatus 20 via the server 60, the accepting unit 19 is the same as in the first embodiment, and a description thereof will be omitted.

  The detection port information receiving unit 71 receives the detection port information transmitted from the server 60 via the communication unit 11. Here, the detection port information is information indicating the position of the port of the first communication control device 3 through which the port detection packet transmitted by the detection packet transmitter 14 has passed.

  Bubble packet transmission port detection unit 72 detects the position of the bubble packet transmission port based on the detection port information received by detection port information reception unit 71. Bubble packet transmission port detector 72 detects the position of the bubble packet transmission port using the port width in first communication control device 3 detected by port width detector 75. The detection of the position of the bubble packet transmission port is performed in the same manner as the bubble packet transmission port detection unit 65 in the first embodiment, and the description thereof is omitted. When the position of the bubble packet transmission port cannot be detected, the bubble packet transmission port detection unit 72 gives an instruction to the port for packet detection again to transmit to the detection packet transmission unit 14, and the bubble packet is transmitted again. An instruction to transmit is passed to bubble packet transmitter 13. As a result, the detection packet transmitter 14 transmits the port detection packet again according to the instruction. The bubble packet transmitter 13 also transmits the bubble packet again according to the instruction. This retransmission is performed until the bubble packet transmission port detection unit 72 can detect the position of the bubble packet transmission port, or a predetermined upper limit number of times (for example, 10 times) or a predetermined time (for example, 30 seconds). Etc.) is repeated until a predetermined limit.

  The bubble packet transmission port transmission unit 73 transmits bubble packet transmission port information indicating the position of the bubble packet transmission port detected by the bubble packet transmission port detection unit 72 to the second information processing apparatus 20 via the server 60.

  The port width detection port information receiving unit 74 receives port width detection port information. Here, the port width detection port information is information indicating the port position of the first communication control device 3 through which the port width detection packet transmitted by the port width detection packet transmitter 15 has passed. The port width detection port information is transmitted from the server 60.

  The port width detection unit 75 detects the port width in the first communication control device 3 based on the port width detection port information received by the port width detection port information reception unit 74. The detection of the port width is performed in the same manner as the port width detection unit 64 in the first embodiment, and the description thereof is omitted.

  FIG. 19 is a block diagram showing a configuration of the second information processing apparatus 20 according to the present embodiment. In FIG. 19, the second information processing apparatus 20 includes a communication unit 21, a reference port detection packet transmission unit 22, a bubble packet transmission port reception unit 23, a reply packet transmission unit 24, and a re-reply packet reception unit 25. A port width detection packet transmission unit 26, a port width detection port information reception unit 81, a port width detection unit 82, and a port width transmission unit 83. The configurations and operations other than the port width detection port information receiving unit 81, the port width detection unit 82, and the port width transmission unit 83 are the same as those in the first embodiment, and a description thereof is omitted.

  The port width detection port information receiving unit 81 receives port width detection port information. Here, the port width detection port information is information indicating the position of the port of the second communication control device 4 through which the port width detection packet transmitted by the port width detection packet transmitter 26 has passed. The port width detection port information is transmitted from the server 60.

  The port width detection unit 82 detects the port width in the second communication control device 4 based on the port width detection port information received by the port width detection port information reception unit 81. The detection of the port width is performed in the same manner as the port width detection unit 64 in the first embodiment, and the description thereof is omitted.

  The port width transmission unit 83 transmits port width information, which is information indicating the port width in the second communication control device 4 detected by the port width detection unit 82, to the first information processing device 10 via the server 60. .

  FIG. 20 is a block diagram showing the configuration of the server 60 according to this embodiment. 20, the server 60 includes a communication unit 61, a reference port detection unit 62, a reference port transmission unit 63, a detection port detection unit 91, a detection port information transmission unit 92, and a port width detection port detection. Unit 93 and a port width detection port information transmission unit 94. The configuration and operation other than the detection port detection unit 91, the detection port information transmission unit 92, the port width detection port detection unit 93, and the port width detection port information transmission unit 94 are the same as those in the first embodiment. The description is omitted.

  The detection port detection unit 91 receives the port detection packet transmitted from the first information processing apparatus 10, and the port of the first communication control apparatus 3 through which the port detection packet has passed based on the port detection packet. The position of is detected. The detection of the port position is performed by acquiring the position of the port of the first communication control device 3 through which the port detection packet included in the port detection packet (for example, included in the header of the port detection packet) has passed. Done.

  The detection port information transmission unit 92 transmits detection port information indicating the position of the port detected by the detection port detection unit 91 to the first information processing apparatus 10.

  The port width detection port detection unit 93 accepts a port width detection packet transmitted from the first information processing apparatus 10 via the first communication control apparatus 3, and based on the port width detection packet, The port position of the first communication control device 3 through which the port width detection packet has passed is detected. Further, the port width detection port detection unit 93 receives a port width detection packet transmitted from the second information processing device 20 via the second communication control device 4, and based on the port width detection packet. The port position of the second communication control device 4 through which the port width detection packet has passed is detected.

  The port width detection port information transmitting unit 94 detects port width detection port information indicating the position of the port of the first communication control device 3 through which the port width detection packet has been detected, detected by the port width detection port detection unit 93. Is transmitted to the first information processing apparatus 10. The port width detection port information transmission unit 94 detects the port width indicating the position of the port of the second communication control device 4 through which the port width detection packet has been detected, detected by the port width detection port detection unit 93. The port information is transmitted to the second information processing apparatus 20.

A first port width detection port detection unit that detects the position of the port in the first communication control device 3 through which the port width detection packet has passed, and a second communication control device through which the port width detection packet has passed. 4 may include a second port width detection port detecting unit that detects the position of the port. Similarly, first port width detection port information for transmitting to the first information processing apparatus 10 port width detection port information indicating the position of the port in the first communication control device 3 through which the port width detection packet has passed. A second port width detection port for transmitting to the second information processing device 20 port width detection port information indicating the position of the port in the transmission unit and the second communication control device 4 through which the port width detection packet has passed. You may provide with an information transmission part. A single port width detection port detection unit 93 and a port width detection port information transmission unit 94 have realized them. That is, in the port width detection port detection unit 93, the part that detects the position of the port in the first communication control device 3 through which the port width detection packet has passed becomes the first port width detection port detection unit. The part that detects the position of the port in the second communication control unit 4 through which the width detection packet has passed becomes the second port width detection port detection unit. Similarly, in the port width detection port information transmission unit 94, port width detection port information indicating the position of the port in the first communication control device 3 through which the port width detection packet has passed is obtained as the first information processing apparatus 10. The first port width detection port information transmission unit is a portion that transmits the port width detection port information, and port width detection port information indicating the position of the port in the second communication control device 4 through which the port width detection packet has passed is second information. The part transmitted to the processing device 20 is the second port width detection port information transmission unit.

  Next, the operation of the communication system according to the present embodiment will be described. The operations until the communication system according to the present embodiment starts communication are the same as those in the embodiment except that the first information processing apparatus 10 instructs the first information processing apparatus 10 to detect a bubble packet transmission port or to retransmit a bubble packet or the like. 1 is the same as the operation shown in FIG.

  Next, the process of step S101 in the flowchart of FIG. 5 will be described with reference to FIG. FIG. 21 is a diagram for explaining the exchange and processing of information among the transmission side, the server, and the reception side. Note that the processing in steps S201 to S206 is the same as that described with reference to FIG. 6 in the first embodiment, and description thereof is omitted.

  (Step S501) The port width detection port detector 93 of the server 60 receives the port width detection packet transmitted from the first information processing apparatus 10. Then, the port width detection port detection unit 93 detects the position of the port of the first communication control device 3 through which the port width detection packet has passed, which is included in the header of the port width detection packet.

  (Step S502) The port width detection port information transmitter 94 detects the port position of the first communication control device 3 through which the port width detection packet has been detected, which is detected by the port width detection port detector 93. Is transmitted to the first information processing apparatus 10. The port width detection port information is received by the port width detection port information receiving unit 74 in the first information processing apparatus 10.

  (Step S503) The port width detection unit 75 detects the port width of the first communication control device 3 based on the port width detection port information received by the port width detection port information reception unit 74. The detection of the port width is performed in the same manner as in the first embodiment, and the description thereof is omitted.

  (Step S <b> 504) The port width detection port detector 93 of the server 60 receives the port width detection packet transmitted from the second information processing apparatus 20. Then, the port width detection port detection unit 93 detects the position of the port of the second communication control device 4 through which the port width detection packet has passed, which is included in the header of the port width detection packet.

(Step S505) The port width detection port information transmission unit 94 indicates information indicating the position of the port of the second communication control device 4 through which the port width detection packet has been detected, which is detected by the port width detection port detection unit 93. Is transmitted to the second information processing apparatus 20. The port width detection port information is received by the port width detection port information receiving unit 81 in the second information processing apparatus 20.

  (Step S506) The port width detection unit 82 detects the port width of the second communication control device 4 based on the port width detection port information received by the port width detection port information reception unit 81. The detection of the port width is performed in the same manner as in the first embodiment, and the description thereof is omitted.

  (Step S507) The port width transmission unit 83 transmits port width information, which is information indicating the port width of the second communication control apparatus 4, together with an instruction to transmit the port width information to the first information processing apparatus 10. Send to server 60.

  (Step S <b> 508) The communication unit 61 of the server 60 receives the port width information and transmits the port width information to the first information processing apparatus 10. The port width information is received by the port width receiving unit 19 in the first information processing apparatus 10.

  Next, the process of step S102 in the flowchart of FIG. 5 will be described with reference to FIG. FIG. 22 is a diagram for explaining the exchange and processing of information among the transmission side, the server, and the reception side. Note that the processing in steps S301 to S303 is the same as that described in FIG. 8 in the first embodiment except that the port detection packet is received by the detection port detection unit 91 in the server 60, and the description thereof is omitted.

  (Step S <b> 601) The detection port detection unit 91 of the server 60 receives the port detection packet transmitted from the first information processing apparatus 10. Then, the detection port detection unit 91 detects the position of the port of the first communication control device 3 through which the port detection packet has passed, which is included in the header of the port detection packet.

  (Step S602) The detection port information transmission unit 92 sets detection port information indicating the position of the port of the first communication control device 3 through which the port detection packet has been detected, detected by the detection port detection unit 91. 1 to the information processing apparatus 10. The detection port information is received by the detection port information receiving unit 71 in the first information processing apparatus 10.

  (Step S <b> 603) The detection port detection unit 91 of the server 60 receives the port detection packet transmitted from the first information processing apparatus 10. Then, the detection port detection unit 91 detects the position of the port of the first communication control device 3 through which the port detection packet has passed, which is included in the header of the port detection packet.

  (Step S604) The detection port information transmitting unit 92 sets detection port information indicating the position of the port of the first communication control device 3 through which the port detection packet has been detected, which is detected by the detection port detection unit 91. 1 to the information processing apparatus 10. The detection port information is received by the detection port information receiving unit 71 in the first information processing apparatus 10.

  (Step S605) The bubble packet transmission port detector 72 of the first information processing device 10 determines the position of the port of the first communication control device 3 used in the transmission of the two port detection packets in steps S301 and S303. And the bubble packet transmission port are determined. Note that the specific determination method is the same as that of the first embodiment, and a description thereof will be omitted.

  In the flowchart of FIG. 22, the case where the first information processing apparatus 10 transmits the bubble packet after receiving the detection port information transmitted in step S602 has been described. The order of transmission of bubble packets is not limited to this. For example, after the second port detection packet transmission (step S303), the first detection port information transmission (step S602) and the second detection port information transmission (step S604) are performed. May be. In addition, detection port information indicating the port positions detected in steps S601 and S603 may be transmitted together.

  Next, the process of step S104 in the flowchart of FIG. 5 will be described with reference to FIG. FIG. 23 is a diagram for explaining the exchange and processing of information among the transmission side, the server, and the reception side. Note that the processing in steps S403 and S404 is the same as that described with reference to FIG. 9 in the first embodiment, and the description thereof is omitted.

  (Step S701) The bubble packet transmission port detector 72 of the first information processing apparatus 10 detects the position of the bubble packet transmission port. Note that the specific determination method is the same as that of the first embodiment, and a description thereof will be omitted.

  (Step S702) The bubble packet transmission port transmission unit 73 of the first information processing apparatus 10 transmits the bubble packet transmission port information together with an instruction to transmit the bubble packet transmission port information to the second information processing apparatus 20. 60.

  (Step S <b> 703) The communication unit 61 of the server 60 receives the bubble packet transmission port information, and transmits the bubble packet transmission port information to the second information processing apparatus 20. The bubble packet transmission port information is received by the bubble packet transmission port reception unit 23 in the second information processing apparatus 20.

  In addition, about the specific example of operation | movement of the communication system in this Embodiment, the detection of the port width in the 1st communication control apparatus 3 and the 2nd communication control apparatus 4 is 1st information processing apparatus 10, and Performed by the second information processing device 20, the position of the bubble packet transmission port is detected by the first information processing device 10, and processing performed accompanying them (for example, the first information of the bubble packet transmission port information) Except for transmission from the processing apparatus 10 to the second information processing apparatus 20, etc.), and the description thereof will be omitted.

  As described above, in the communication system according to the present embodiment, in addition to the same effects as those of the first embodiment, the detection of the port width and the bubble packet transmission port in the first communication control device 3 and the second communication control device 4 The processing load on the server 60 can be reduced by detecting the position of the first information processing apparatus 10 and the second information processing apparatus 20. In particular, processing that requires standby (for example, processing that waits for the second port detection packet to be transmitted after the first port detection packet is transmitted) has a large processing load. By not performing processing that requires standby on the server, the processing load on the server 60 is greatly reduced.

  In the present embodiment, the case where the first information processing apparatus 10 detects the port width in the first communication control apparatus 3 has been described. However, in the first information processing apparatus 10, the bubble packet transmission port The detection and transmission of the bubble packet transmission port may be performed, and the detection of the port width in the first communication control device 3 may be performed in the server as in the first embodiment. Similarly, either the detection of the port width in the second communication control device 4 or the detection of the position of the bubble packet transmission port may be performed in the server as in the first embodiment.

In the present embodiment, the case where the second information processing apparatus 20 detects the port width in the second communication control apparatus 4 has been described. However, the detection of the port width in the second communication control apparatus 4 It may be performed in one information processing apparatus 10. By doing so, it is not necessary to transmit port width information from the second information processing apparatus 20 to the first information processing apparatus 10 via the server 60. In this case, port width detection port information, which is information indicating the position of the port in the second communication control device 4 through which the port width detection packet transmitted from the second information processing device 20 has passed, The data is transmitted from the server 60 to the first information processing apparatus 10.

  In the present embodiment, the case where the bubble packet transmission port is detected by the first information processing apparatus 10 has been described, but the bubble packet transmission port may be detected by the second information processing apparatus 20. By doing so, it is not necessary to transmit bubble packet transmission port information from the first information processing apparatus 10 to the second information processing apparatus 20 via the server 60. In this case, the detection port information, which is information indicating the position of the port in the first communication control device 3 through which the port detection packet transmitted from the first information processing device 10 has passed, is received from the server 60. It is transmitted to the second information processing apparatus 20. In this case, the second information processing device 20 may detect the port width in the first communication control device 3.

  In the present embodiment, the case where the reference port information is transmitted from the server 60 to the first information processing apparatus 10 has been described. However, the reference port information is the second information processing that transmits the reference port detection packet. It may be transmitted to the device 20. In this case, the reference port information is transmitted again from the second information processing apparatus 20 to the first information processing apparatus 10 via the server 60.

  Also, in this embodiment, an information processing device that transmits information indicating the port position in the communication control device through which the packet has passed is specified for the port width detection packet, the reference port detection packet, and the port detection packet. Information (for example, a device ID and an IP address) is included, and the server 60 may transmit information indicating the detected port position based on the information. For example, the port width detection packet transmitted by the port width detection packet transmitter 15 includes the device ID of the first information processing apparatus 10 that is the transmission destination of the port width detection port information. The port information transmission unit 94 may transmit port width detection port information to the first information processing apparatus 10 corresponding to the device ID.

(Embodiment 3)
A communication system according to Embodiment 3 of the present invention will be described with reference to the drawings. In the communication system according to the present embodiment, one information processing apparatus performs direct communication without using a communication control apparatus.

  FIG. 24 is a block diagram showing a configuration of a communication system according to the present embodiment. 24, the communication system according to the present embodiment includes a first information processing device 1, a second information processing device 2, a first communication control device 3, and a server 6. The communication system according to the present embodiment shown in FIG. 24 is the same as the communication system according to the first embodiment except that the second communication control device is not provided. The configurations and operations of the first information processing apparatus 1, the second information processing apparatus 2, and the server 6 are the same as those in the first embodiment, and a description thereof is omitted.

Here, since the second information processing apparatus 2 performs communication without using the communication control apparatus, the second information processing apparatus 2 performs communication through the communication control apparatus of the Full Cone NAT. To be judged. Therefore, the operation in the present embodiment is the same as that in the first embodiment when the second communication control device 4 is a Full Cone NAT, and the first information processing device 1 and the second information processing device 2 are the same. (In FIG. 17, the case where one NAT is an Open NAT corresponds to this embodiment).

  As described above, according to the communication system according to the present embodiment, even when the second information processing apparatus 2 performs communication without going through the communication control apparatus, the first information processing apparatus 1 and the second information processing apparatus 2 Communication with the information processing apparatus 2 can be established.

  In the present embodiment, the configuration in which the second communication control device is not provided in the communication system in the first embodiment has been described, but the second communication control device is not provided in the communication system in the second embodiment. It may be a configuration. Even when the second information processing apparatus does not pass through the communication control apparatus, communication between the first information processing apparatus and the second information processing apparatus can be established.

  Moreover, although the case where the second information processing apparatus 2 performs communication without using the communication control apparatus has been described in the present embodiment, the second information processing apparatus 2 performs communication via the communication control apparatus. Even when the first information processing apparatus 1 performs communication without going through the communication control apparatus, the communication between the first information processing apparatus 1 and the second information processing apparatus 2 is similarly established. be able to.

  In each of the above embodiments, the case where the servers 6 and 60 have a function of notifying the information processing apparatus of the IP address of the communication control apparatus of the other party has been described. However, this function is different from the server 6 and the like. May be realized. In other words, a server that notifies one information processing device of the address of the other communication control device and a server that performs processing for detecting a bubble packet transmission port and the like may be different servers. That is, in the communication system shown in FIG. 25, the first information processing apparatus 1 and the second information processing apparatus 2 use the addresses of the first communication control apparatus 3 and the second communication control apparatus 4 as address servers. The server 6a may be used in the processing acquired from 6b and establishing communication between the information processing apparatuses.

  Also, the process of notifying the address of the other communication control device (or the information processing device if no communication control device is provided) to one information processing device or the information processing device on the calling side being the partner (calling side) SIP (Session Initiation Protocol) may be used in processing for calling an information processing apparatus.

  In each of the above embodiments, it has been described that the reference port is the most recently assigned port when the reference port detection packet is transmitted. However, this reference port may not be the most recently assigned port. For example, the devices connected to the second communication control device 4 are only the second information processing devices 2 and 20, and it is possible to roughly grasp the number of ports used in the second communication control device 4. If possible, the port of the second communication control device 4 used for communication with the servers 6 and 60 may be used as the reference port. In this case, the reference port detection packet is a packet for communicating with the servers 6 and 60.

  In each of the above embodiments, the case where the port detection packet is mainly transmitted twice before and after the transmission of the bubble packet has been described. However, the port detection packet is transmitted any one time before and after the transmission of the bubble packet. Just do it. In this case, the bubble packet transmission port is detected on the assumption that the bubble packet transmission port and the port of the first communication control device 3 used for transmitting the port detection packet are continuous. If the assumption is not correct, the reference port detection packet is transmitted again (the processing from step S101 is repeated).

In each of the above embodiments, the bubble packet transmission port detectors 65 and 72
Although the case where the position of the bubble packet transmission port is detected after determining whether the position of the bubble packet transmission port can be detected has been described, in a predetermined case, the determination of the bubble packet transmission port is not performed without performing the determination. The position may be detected. The predetermined case means that, for example, the first communication control device 3 is not connected to any device other than the first information processing devices 1 and 10 and is used for transmitting the bubble packet transmission port and the port detection packet. There is a case where there is a high possibility that the port of the first communication control device 3 is continuous. In this case, if the position of the detected bubble packet transmission port is incorrect and the NAT type used in the first communication control device 3 is a predetermined type, the reply packet is processed as the first information processing. The devices 1 and 10 are not accepted, and the process is repeated from the transmission of the reference port detection packet again.

  When the bubble packet transmission port detectors 65 and 72 determine that the bubble packet transmission port and the port of the first communication control device 3 used for transmitting the port detection packet are not continuous, As described in the above embodiments, a retransmission instruction may be transmitted to the first information processing apparatus 1, a retransmission instruction may be issued to the bubble packet transmission apparatus 13 or the like, or communication establishment may be performed. The processing from the transmission of the reference port detection packet may be performed again.

  The bubble packet transmission port detectors 65 and 72 continuously determine whether or not the bubble packet transmission port and the port of the first communication control device 3 used for transmitting the port detection packet are continuous. When the probability of being is high, it may be performed by determining that it is continuous. For example, when the port width of the first communication control device 3 can change between “1” and “2” (for example, when it changes over time), the first used for transmission of the port detection packet If the port interval of the communication control device 3 is “2”, “3”, or “4”, there is a possibility that the port is continuous. Even in this case, for example, if the interval of the ports of the first communication control device 3 used for transmission of the port detection packet is “5”, it is determined that it is not continuous.

  In each of the above-described embodiments, the case where the port width is detected by the port width detectors 64, 75, and 82 has been described. This port width can be manually input by a user or a predetermined recording medium (for example, a CD-ROM). Or a removable memory, etc.), may be passed to the servers 6 and 60 and the first information processing apparatus 1 and 10 by communication, or the port width stored in the first communication control apparatus 3 or the like You may get it. This also applies to the fact that the first information processing device 1, 10, etc. knows the IP address of the second communication control device 4, etc. That is, the IP address may be input to the first information processing apparatus 1, 10 or the like by a user's manual input or the like.

  In each of the above embodiments, the first information processing apparatuses 1 and 10 transmit a bubble packet and a port detection packet using the new ports of the first information processing apparatuses 1 and 10, respectively. As described above, for example, when the first information processing apparatus 1 detects that the first communication control apparatus 3 uses the NAT that is the port assignment rule of Port Sensitive, the first information processing apparatus 1 10 may transmit the bubble packet and the port detection packet from the same port of the first information processing apparatus 1 or 10. However, in this case, it is necessary to make the transmission destination ports (ports of the servers 6 and 60) of the port detection packet different.

In each of the above embodiments, the case where the reply packet is transmitted using the port of the second communication control device 4 newly assigned at the time of transmission of the reply packet has been described. Ports of the second communication control device 4 used for packet transmission may include ports used so far, for example, ports used for transmission of reference port detection packets.

  Further, the number (α) of ports that can be allocated from the reference port to the bubble packet transmission target port may be increased every time a bubble packet or the like is retransmitted. That is, every time the bubble packet transmission unit 13 retransmits the bubble packet, the bubble packet transmission unit 13 may transmit the bubble packet to a bubble packet transmission target port that is further away from the reference port. This makes it easier to avoid the use of the bubble packet transmission target port until the reply packet is transmitted.

  In each of the above embodiments, the reply packet transmission unit 24 receives the number (α) of ports that can be allocated from the reference port to the bubble packet transmission target port via the server 6 from the bubble packet transmission unit 13. The value of α may be transmitted from the servers 6 and 60 to the bubble packet transmitter 13 and the reply packet transmitter 24 (in this case, the port width information is the first information processing). The value of α may be set in advance in the first information processing apparatus 1, 10 and the second information processing apparatus 2, 20.

  In each of the above embodiments, it has been described that the reply packet transmitter 24 transmits reply packets corresponding to the number (α) of ports that can be allocated from the reference port to the bubble packet transmission target port. 24 may transmit a reply packet equal to or larger than α, or may transmit a reply packet equal to or smaller than α. For example, the reply packet transmission unit 24 does not receive the value of α from the bubble packet transmission unit 13 via the servers 6 and 60, but receives the difference between the port numbers of the reference port and the bubble packet transmission target port. The number of reply packets corresponding to the value of may be transmitted. In this case, the reply packet transmitter 24 transmits reply packets that are multiples of α. Here, as described in connection with step S209 in FIG. 6, the port width in the second communication control device 4 detected by the port width detection units 68 and 82 may be a multiple of the actual port width. In this case, the value of the port number difference between the reference port and the bubble packet transmission target port should be the number of return packets. This is because the transmission of the reply packet using the bubble packet transmission target port can be performed more reliably. Also, for example, when the second information processing device 2 or 20 knows the number of ports assigned after the reference port assignment in the second communication control device 4, subtract that number from α. Any number of reply packets may be sent. Even if it does so, it is because a reply packet will be transmitted using a bubble packet transmission object port (however, the detection of the port width of the 2nd communication control apparatus 4 needs to be accurate). Therefore, when up to the port preceding the bubble packet transmission target port is allocated, only one reply packet may be transmitted.

  In each of the above-described embodiments, a case has been described in which a reply packet is transmitted after a reply packet is received. However, the first information processing apparatuses 1 and 10 and the second information processing apparatus 2 are received by receiving a reply packet. , 20 may be established, the reply packet need not be sent. For example, when the first information processing apparatus 1 or 10 accepts a reply packet transmitted using a bubble packet transmission target port, peer-to-peer communication via the bubble packet transmission port and the bubble packet transmission target port Therefore, it is not necessary to send a re-reply packet.

Further, in the specific examples of the above embodiments, whether or not the reply packet has been accepted is received via the servers 6 and 60 that the reply packet has been transmitted from the second information processing apparatus 2 or 20. Judgment is made based on whether or not a reply packet has already been received. For example, if a reply packet is not accepted even after a predetermined time (for example, 15 seconds) has elapsed since the transmission of the bubble packet, the reply packet is accepted. It may be determined that communication could not be established (that is, communication could not be established). This also applies to the reply packet. If the reply packet is not accepted even after a predetermined time has elapsed since the reply packet was transmitted, the reply packet could not be accepted ( That is, it may be determined that communication could not be established.

  Further, in each of the above embodiments, the case where the transmission of the reference port information or the detection of the bubble packet transmission port is performed by one server 6 or 60 has been described, but the processing may be performed by a plurality of servers. Good.

(Embodiment 4)
A communication system according to Embodiment 4 of the present invention will be described with reference to the drawings. In the communication system according to the present embodiment, a case will be described in which SIP communication is performed using the bubble packet transmission port position detection method described in the above embodiments.

  FIG. 26 is a block diagram showing a configuration of a communication system according to the present embodiment. In FIG. 26, the communication system according to the present embodiment includes a first information processing device 30, a communication control device 3, a second information processing device 40, a port detection server 51, and a SIP server 52. The communication control device 3 has a NAT function and performs address conversion, port assignment, packet filtering, and the like, and is the same as the first communication control device 3 in each of the above embodiments. Therefore, the description thereof is omitted.

  FIG. 27 is a block diagram showing a configuration of the first information processing apparatus 30 according to the present embodiment. 27, the first information processing apparatus 30 includes a communication unit 11, a bubble packet transmission unit 13, a detection packet transmission unit 14, a port width detection packet transmission unit 15, and a detection port information reception unit 71. A bubble packet transmission port detection unit 72, a port width detection port information reception unit 74, a port width detection unit 75, and a SIP processing unit 31. The configuration and operation other than the SIP processing unit 31 are the same as those in the second embodiment, and a description thereof will be omitted. However, the bubble packet transmitting unit 13 does not transmit a bubble packet based on the position of the reference port indicated by the reference port information received by the reference port receiving unit 12, but the bubble packet transmission target port received from the SIP processing unit 31. The bubble packet is transmitted to the bubble packet transmission target port based on the information indicating the position of the bubble packet.

  The SIP processing unit 31 performs processing related to SIP. Specifically, processing such as transmission of a connection request and acquisition of the address and port number of the communication partner is performed with the SIP server 52. Since these processes are the same as those conventionally performed, the description thereof is omitted.

  The second information processing apparatus 40 is a terminal apparatus (for example, a VoIP telephone terminal apparatus) that performs peer-to-peer voice communication with another client terminal via the SIP server 52. The second information processing apparatus 40 teaches other client terminals via the SIP server 52 the IP address of the second information processing apparatus 40, the position of the transmission port, and the position of the reception port. The receiving port of another client terminal can be received via the SIP server 52, and the packet transmission destination can be set to the receiving port in Peer to Peer voice communication. Here, the transmission port of a certain client terminal is a port through which the client terminal transmits information to other client terminals. A reception port of a client terminal is a port through which the client terminal receives information from another client terminal. The second information processing apparatus 40 is a general SIP client terminal, and a detailed description thereof is omitted.

FIG. 28 is a block diagram showing the configuration of the port detection server 51 according to this embodiment.
In FIG. 28, the port detection server 51 performs processing for detecting the position of the port of the communication control device 3 through which the bubble packet transmitted from the first information processing device 30 has passed. The port detection server 51 includes a communication unit 61, a detection port detection unit 91, a detection port information transmission unit 92, a port width detection port detection unit 93, and a port width detection port information transmission unit 94. . Each of these configurations is the same as that of the second embodiment, and the description thereof is omitted.

  The SIP server 52 is a server that performs processing related to SIP. As processing related to SIP, for example, a registrar processing for registering an address upon receiving an address notification from a client, a location service processing for managing a client address, and a location service receiving a call request from a client. For example, a proxy server process that searches for a destination address and forwards it to a destination client. Each function of the SIP server 52 may be realized by two or more servers. Further, this SIP server may be provided on each of the first information processing apparatus 30 side and the second information processing apparatus 40 side. In this case, for example, the first information processing device 30, the first SIP server, the second SIP server, the second information processing device 40, and the second information Information relay up to the processing device 40 is performed. Since the processing of the SIP server 52 is the same as the processing conventionally performed, the detailed description thereof is omitted.

  Next, the operation of the communication system according to the present embodiment will be described. FIG. 29 is a diagram for explaining information exchange and processing among the calling side, the port detection server 51, the SIP server 52, and the called side. In FIG. 29, it is assumed that the first information processing device 30 and the communication control device 3 are the calling side, and the second information processing device 40 is the called side.

  (Step S801) By transmitting / receiving a predetermined packet between the first information processing device 30 which is a device on the calling side and the port detection server 51, the port width of the communication control device 3 on the calling side. Is detected. The specific processing for detecting the port width is the same as steps S206, S501, S502, and S503 in FIG. 21 of the second embodiment, and a description thereof is omitted.

  (Step S <b> 802) The first information processing apparatus 30 transmits a communication request to the SIP server 52 to request communication with the second information processing apparatus 40. In this communication request, an instruction to transmit to the first information processing apparatus 30 the IP address of the communication destination client (that is, the second information processing apparatus 40), the position of the transmission port, and the position of the reception port. Is included.

  (Step S803) The SIP server 52 relays the communication request transmitted from the first information processing apparatus 30 to the second information processing apparatus 40. The communication request is received by the second information processing apparatus 40.

  (Step S804) The second information processing apparatus 40 transmits communication destination information including information indicating the IP address, the transmission port position, and the reception port position of the second information processing apparatus 40 to the SIP server 52.

  (Step S <b> 805) The SIP server 52 relays the communication destination information transmitted from the second information processing apparatus 40 to the first information processing apparatus 30. The communication destination information is received by the SIP processing unit 31 of the first information processing apparatus 30.

(Step S <b> 806) The first information processing apparatus 30 transmits a port detection packet and a bubble packet, and receives detection port information from the port detection server 51. The specific processing for transmission / reception of the bubble packet and the like is the same as the processing in FIG. In the present embodiment, the bubble packet is transmitted to the transmission port of the second information processing apparatus 40 using the communication destination information received by the SIP processing unit 31. That is, in the present embodiment, the bubble packet transmission target port is the transmission port of the second information processing apparatus 40. In the determination of continuity (step S605 in FIG. 21), the port width of the communication control device 3 detected in step S801 is used.

  (Step S807) The bubble packet transmission port detector 72 of the first information processing apparatus 30 determines whether or not the position of the bubble packet transmission port can be detected. In the determination of continuity in step S806 (step S605 in FIG. 21), it is determined that the port of the communication control device 3 used for transmitting the two port detection packets and the bubble packet transmission port are continuous. In this case, it is determined that the position of the bubble packet transmission port can be detected, and the process proceeds to step S808. Otherwise, it is determined that the position of the bubble packet transmission port cannot be detected, and the process returns to step S806.

  (Step S808) Bubble packet transmission port detector 72 detects the position of the bubble packet transmission port. The position of the bubble packet transmission port is the position of the reception port on the calling side.

  (Step S809) The SIP processing unit 31 sends a communication request including the IP address on the global side of the communication control device 3 and the position of the bubble packet transmission port (ie, reception port) detected in Step S808 to the SIP server 52. Send to. Note that the global IP address of the communication control device 3 is acquired in advance in processing such as port width detection.

  (Step S810) The SIP server 52 relays the communication request transmitted from the first information processing apparatus 30 to the second information processing apparatus 40. The communication request is received by the second information processing apparatus 40.

  (Step S811) In response to the received communication request, the second information processing apparatus 40 transmits a response indicating that preparation for connection has been completed.

  (Step S812) The SIP server 52 relays the response to the first information processing apparatus 30.

  (Step S813) The first information processing apparatus 40 transmits a confirmation for the response received from the second information processing apparatus 40.

  (Step S814) The SIP server 52 relays the confirmation to the second information processing apparatus 40. In this way, the preparation for peer-to-peer connection on the calling side and the called side is completed, and the first information processing device 30 transmits information to the reception port of the second information processing device 40. The second information processing device 40 transmits information to the reception port (bubble packet transmission port) of the communication control device 3, so that the first information processing device 30 and the second information processing device 40 are connected. Thus, communication without using a relay server such as the SIP server 52 is performed.

Note that the order of processing of each step in FIG. 29 has a certain degree of arbitraryness. For example, if the port width detection process in step S801 is performed before the transmission / reception process of bubble packets or the like in step S806, a communication request transmission process (step S802) or a communication destination information transmission process ( It may be executed after step S804).

  Next, the operation of the communication system according to the present embodiment will be described using a specific example. In this specific example, it is assumed that the first information processing apparatus 30 and the second information processing apparatus 40 have registered address information with the SIP server 52 in advance. Further, the device ID of the first information processing apparatus 30 is “AAA @ abc ... com”, and the device ID of the second information processing apparatus 40 is “BBB @ abc ... com”. To do. Here, this specific example describes a case where the device ID is “AAA @ abc ... com” or the like, but the device ID is information that can identify the client terminal such as an email address or a telephone number. As long as it is any format, any format may be used.

  First, the first information processing device 30 detects the port width of the communication control device 3 by transmitting a port width detection packet to the port detection server 51 (step S801). Details of this processing are the same as those in the second embodiment, and the description thereof is omitted.

  Next, the first information processing apparatus 30 transmits a communication request from the port P1 shown in FIG. 30 to the port P3 of the SIP server 52 (step S802). This communication request is a so-called “INVITE request”. In this communication request, the device ID “AAA @ abc ... com” of the first information processing device 30 and the device ID “BBB @ abc..com” of the second information processing device 40 of the counterpart who requests communication are included. .com ". This communication request includes an instruction to transmit information indicating the IP address, the position of the transmission port, and the position of the reception port. Note that it may be determined that the second information processing apparatus 40 has received an instruction to transmit an IP address or the like by receiving a communication request. That is, an instruction command may not be included in the communication request.

  The communication request is received by the SIP server 52. Then, the SIP server 52 searches for the IP address and port number corresponding to the device ID “BBB @ abc ... com” of the second information processing apparatus 40, and sends a communication request to the port number of the IP address. Is transmitted (step S803).

  When the second information processing apparatus 40 receives the communication request, the second information processing apparatus 40 receives communication destination information, which is information indicating the IP address of the second information processing apparatus 40, the position of the transmission port sPort, and the position of the reception port rPort. It transmits to port P3 of the SIP server 52 (step S804). This communication destination information also includes the device ID of the first information processing device 30 and the device ID of the second information processing device 40. In normal SIP, the communication destination information does not include the position of the communication destination transmission port. Therefore, the point that the communication destination information includes the position of the transmission port of the communication destination is an extension of SIP.

  The communication destination information is received by the SIP server 52 and transmitted to the first information processing apparatus 30 via the communication control apparatus 3 (step S805). The communication destination information is received by the SIP processing unit 31 of the first information processing apparatus 30. The SIP processing unit 31 passes the IP address of the second information processing apparatus 40 included in the communication destination information and information indicating the position of the transmission port sPort to the bubble packet transmission unit 13.

After that, bubble packet transmission processing and the like are performed (step S806). Specifically, the detection packet transmitter 14 transmits the port detection packet from the port P5 newly assigned in the first information processing apparatus 30 to the port P11 of the port detection server 51. The port detection packet is received by the detection port detection unit 91 of the port detection server 51, and the port number of the port P8 of the communication control device 3 included in the header of the port detection packet is detected. The detection port information transmission unit 92 transmits detection port information including the port number of the port P8 in the payload to the port P8 of the communication control device 3. The port information for detection is address-converted in the communication control device 3 and transmitted to the port P5 of the first information processing device 30. Then, the detection port information receiving unit 71 receives the detection port information.

  Immediately after the transmission of the port detection packet, the bubble packet transmitter 13 transmits the bubble packet to the port sPort of the second information processing apparatus 40. The bubble packet is transmitted from the port P6 of the first information processing apparatus 30. Here, the port P6 is a port different from the port P5, and is a port newly assigned in the first information processing apparatus 30 when the bubble packet is transmitted.

  Immediately after the transmission of the bubble packet, the detection packet transmitter 14 transmits the port detection packet to the port P11 of the port detection server 51 again. The port detection packet is transmitted from the port P7 of the first information processing apparatus 30. Here, the port P7 is a port different from the ports P5 and P6, and is a port newly assigned in the first information processing apparatus 30 when the port detection packet is transmitted. The port detection packet is received by the port detection server 51. Similarly to the case of the first port detection packet, detection port information is transmitted from the port detection server 51 to the first information processing apparatus 30.

  The detection port information receiving unit 71 of the first information processing device 30 receives this detection port information, and the position of the port of the communication control device 3 used for transmission of the two port detection packets, and bubble packet transmission Determine if the port is continuous. This determination is made based on whether or not the difference between the port P10 and the port P8 is equal to twice the port width of the communication control device 3 detected in step S801. If the difference between the port P10 and the port P8 is twice the port width of the communication control device 3, the bubble packet transmission port detection unit 72 uses the communication control device used for transmitting the two port detection packets. 3 and the bubble packet transmission port are determined to be continuous, it is determined that the bubble packet transmission port can be detected (step S807), and the port number of the port P8 and the port number of the port P10 are determined. Is detected as the position of the bubble packet transmission port (step S808). The bubble packet transmission port detection unit 72 passes the detected position of the bubble packet transmission port to the SIP processing unit 31.

  The SIP processing unit 31 again transmits a communication request including the position of the bubble packet transmission port and the global address of the communication control device 3 to the SIP server 52 (step S809). This communication request is also referred to as a so-called “INVITE request”, and includes the device ID of the first information processing device 30 and the device ID of the second information processing device 40. The communication request is relayed by the SIP server 52 and transmitted to the second information processing apparatus 40 (step S810). This communication is also performed via the ports P1 to P4.

  The second information processing device 40 can know the IP address of the calling side and the position of the receiving port by receiving the communication request. The second information processing apparatus 40 transmits a response to the communication request to the SIP server 52 (step S811). This response also includes the device IDs of the first information processing apparatus 30 and the second information processing apparatus 40. The response is relayed by the SIP server 52 and transmitted to the first information processing apparatus 30 via the port P2 of the communication control apparatus 3 (step S812).

In response to the response from the communication partner, confirmation of the response is transmitted via the SIP server 52 (steps S813 and S814). This transmission of confirmation is called “ACK”. Thereafter, as shown in FIG. 31, information is transmitted from the first information processing apparatus 30 to the port rPort of the second information processing apparatus 40, and the communication control apparatus 3 is transmitted from the second information processing apparatus 40. Information is transmitted to port P9. The information transmitted to the port P9 of the communication control device 3 is address-converted in the communication control device 3 and transmitted to the port P6 of the first information processing device 30. In this way, communication is established between the first information processing apparatus 30 and the second information processing apparatus 40, and a call is made between them.

  In the present embodiment, the sequence illustrated in FIG. 29 is used for description. However, the sequence for establishing communication between the information processing apparatuses is not limited to that illustrated in FIG. For example, even when the information indicating the IP address of the second information processing device 40 and the information indicating the position of the reception port are transmitted to the first information processing device 30 via the SIP server 52 in the transmission of the response in step S811. Good. In this case, the first information processing apparatus 30 uses the information transmitted via the SIP server 52, so that the first information processing apparatus 30 and the second information processing apparatus 40 are connected. Communication is established. However, the IP address of the second information processing apparatus 40 transmitted in step S811 is the same as that transmitted in step S804. In addition, the second information processing apparatus 40 uses the transmission port indicated by the communication destination information transmitted in step S804 as a transmission port in communication with the first information processing apparatus 30.

  As described above, according to the communication system according to the present embodiment, by using the method for detecting the position of the bubble packet transmission port described in the first to third embodiments, what kind of communication control device 3 is used. Even when NAT is used, communication between information processing apparatuses using SIP can be established. As described above, the method of detecting the position of the bubble packet transmission port may be used in systems other than the systems and sequences described in the first to third embodiments.

  In the present embodiment, the case in which the port width of the communication control device 3 and the position of the bubble packet transmission port are detected on the client side has been described. However, as in the first embodiment, among these processes, Any one or more processes may be performed on the server side.

  In the present embodiment, the case where the port detection server 51 and the SIP server 52 are provided separately has been described, but they may be configured as the same server.

  In this embodiment, the case where communication between information processing apparatuses is established using SIP has been described, but another protocol for establishing communication between information processing apparatuses may be used. Even in this case, by providing the port detection server 51, the position of the bubble packet transmission port can be detected, and communication via the communication control device having the NAT function can be performed.

For example, as described in the fourth embodiment, in each of the above embodiments, the communication system includes an information processing apparatus that transmits a bubble packet, a server that performs processing for detecting the position of the bubble packet transmission port, and May be for detecting the position of the bubble packet transmission port. That is, the communication system in the present invention may be the following communication system. The communication system is a communication system including an information processing device, a communication control device that controls communication of the information processing device, and a server, and the information processing device is connected to the communication control device via the communication control device. A bubble packet transmitter for transmitting bubble packets for leaving a transmission history, and a port detection packet used for detecting the position of a bubble packet transmission port, which is a port of a communication control device, used for transmission of bubble packets. A detection packet transmission unit that transmits to the server before and after the bubble packet transmission unit transmits the bubble packet, and the server receives the port detection packet transmitted from the information processing apparatus, and converts the packet into a port detection packet. A bubble packet transmission port detector for detecting the position of the bubble packet transmission port based on . In this communication system, the position of the bubble packet transmission port detected in the server may be transmitted to the information processing apparatus by the transmission unit, or may be passed to the information processing apparatus by other methods. As another method, for example, information indicating the position of the bubble packet transmission port may be recorded on a recording medium, and the information processing apparatus may read the information from the recording medium. Alternatively, the server may use the bubble packet transmission port. The information indicating the position of the port may be displayed, and by viewing the display, the user may input information indicating the port range to the information processing apparatus.

  For example, as described in the fourth embodiment, in each of the above embodiments, the communication system includes an information processing apparatus that transmits a bubble packet, a server that performs processing for detecting the position of the bubble packet transmission port, and May be for detecting the position of the bubble packet transmission port. That is, the communication system according to the present invention may be the following communication system. The communication system is a communication system including an information processing device, a communication control device that controls communication of the information processing device, and a server, and the information processing device is connected to the communication control device via the communication control device. A bubble packet transmission unit that transmits a bubble packet for leaving a transmission history, and a port detection packet that is used to detect the position of the bubble packet transmission port that is a port of the communication control device, which is used in the transmission of the bubble packet. The detection packet transmission unit that transmits to the server before and after the bubble packet transmission unit transmits the bubble packet, and the detection port that receives the detection port information indicating the position of the port of the communication control device through which the port detection packet has passed Based on the detection port information received by the information reception unit and the detection port information reception unit, bubble packet transmission is performed. A bubble packet transmission port detection unit for detecting a port position, wherein the server accepts the port detection packet and detects the port position of the communication control device through which the port detection packet has passed. And a detection port information transmission unit that transmits detection port information indicating the position of the port detected by the detection port detection unit to the information processing apparatus. Thus, the position of the bubble packet transmission port may be detected by the information processing apparatus instead of the server. In this communication system, the position of the bubble packet transmission port detected in the information processing apparatus may be transmitted to the other information processing apparatus by the transmission unit, or passed to the other information processing apparatus by another method. Also good. As another method, for example, information indicating the position of the bubble packet transmission port may be recorded on a recording medium, and another information processing apparatus may read the information from the recording medium, or in the information processing apparatus Information indicating the position of the bubble packet transmission port may be displayed, and by viewing the display, the user may input information indicating the position of the bubble packet transmission port to another information processing apparatus.

  In each of the above embodiments, the case where each information processing apparatus is connected to the communication line 5 through only one communication control apparatus has been described. However, the information processing apparatus is connected to the communication line 5 via a plurality of communication control apparatuses. Communication (ie, multi-stage NAT), it is possible to establish communication between information processing apparatuses.

In each of the above embodiments, the first communication control device 3 and the second communication control device 4 have been described as having the NAT function. However, the first communication control device 3 and the second communication control device 4 have the NAT function. The communication control device 4 may have a firewall function for packet filtering instead of the NAT function or together with the NAT function. Here, the packet filtering is, for example, selection of a received packet based on the above-described reception filter rule. When the first communication control device 3 has a firewall function based on such a reception filter rule, a bubble packet from the local side (the first information processing device 1 or the like) to the global side (the communication line 5) By leaving the transmission history in the first communication control device 3 by transmitting the message, it becomes possible to accept the reply packet transmitted to the bubble packet transmission port. Further, when the second communication control device 4 has a firewall function based on such a reception filter rule, the bubble packet transmission target port from the local side (the second information processing device 2 or the like) to the global side By transmitting the reply packet via the communication information, communication between the first information processing apparatus 1 and the like and the second information processing apparatus 2 and the like can be established.

  Further, the first information processing apparatus and the second information processing apparatus may or may not implement a firewall function as an application.

  Further, although cases have been described with the above embodiments where the server 6 or the like is specified by an IP address, the server 6 or the like may be specified by a domain name (for example, server.pana.net). In this case, the domain name is converted into an IP address using a DNS server, whereby the server can be specified.

  Further, the protocol used for communication in each of the above embodiments may be IPv4 (Internet Protocol version 4) or IPv6 (Internet Protocol version 6).

  In each of the above embodiments, each process (each function) may be realized by centralized processing by a single device (system), or by distributed processing by a plurality of devices. May be.

  Further, although cases have been described with the above embodiments where a communication requesting side is a side that transmits a bubble packet, a side that receives a communication request may be a side that transmits a bubble packet.

  In each of the above embodiments, each component may be configured by dedicated hardware, or a component that can be realized by software may be configured by software under program control. The software that realizes the information processing apparatus in each of the above embodiments is a program as described below. In other words, the program is sent to the computer via the first communication control device that controls communication of the first information processing device and the second communication control device that controls communication of the second information processing device. A program for executing processing in a first information processing apparatus that communicates with a second information processing apparatus, the target of transmission of a bubble packet transmitted to leave a transmission history in the first communication control apparatus A reference port receiving step for receiving reference port information indicating a position of a reference port that is a port in the second communication control device serving as a reference, and a bubble packet is transmitted via the first communication control device based on the reference port information. A bubble packet transmitting step for transmitting to the second communication control device, and a bubble packet which is a port of the first communication control device used for transmitting the bubble packet In order to detect the position of the communication port, a detection packet transmission step for transmitting a port detection packet and a bubble packet transmission port are transmitted from the second information processing device via the second communication control device. A reply packet receiving step for receiving the reply packet.

  Further, in this program, the reference port is a point in time when a reference port detection packet for detecting the position of the reference port among the ports assigned by the second communication control device is transmitted from the second information processing device. May be the latest port.

In this program, in the detection packet transmission step, the port detection packet may be transmitted before and after transmitting the bubble packet in the bubble packet transmission step.

  In this program, the bubble packet and the port detection packet may be transmitted using different ports in the first communication control apparatus.

  In this program, the bubble packet and the port detection packet may be transmitted using a port newly assigned in the first information processing apparatus.

  The program further causes the computer to execute a retransmission instruction reception step for receiving a retransmission instruction for retransmitting the bubble packet and the port detection packet. In the detection packet transmission step, the retransmission instruction reception step The port detection packet may be retransmitted when the retransmission instruction is received in step 1. In the bubble packet transmission step, the bubble packet may be transmitted again when the retransmission instruction is received in the retransmission instruction reception step.

  The program further includes a port width detection packet transmission step of transmitting, to the computer, a port width detection packet for detecting the port width in the first communication control device via the first communication control device. It may be executed.

  In this program, the bubble packet transmission target port, which is the target port for transmitting bubble packets in the second communication control device, may be a port assigned after a predetermined port assignment from the reference port.

  In this program, the computer further executes a port width receiving step for receiving port width information, which is information indicating the port width in the second communication control apparatus. In the bubble packet transmitting step, the port interval with the reference port is A bubble packet may be transmitted to a bubble packet transmission target port that is M times the port width indicated by the port width information (M is an integer of 1 or more).

  Also, in this program, when a reply packet is accepted in the reply packet accepting step, the program sends a re-reply packet to the port of the second communication control device used for sending the reply packet. A reply packet transmission step may be further executed.

  Further, in this program, the detection port information receiving step for receiving the detection port information indicating the position of the port of the first communication control device through which the port detection packet has passed and the detection port information receiving step are received by the computer. Based on the detected port information, a bubble packet transmission port detection step for detecting the position of the bubble packet transmission port and bubble packet transmission port information indicating the position of the bubble packet transmission port detected in the bubble packet transmission port detection step are transmitted. The bubble packet transmission port transmission step to be performed may be further executed.

  Further, in this program, when the position of the bubble packet transmission port cannot be detected in the bubble packet transmission port detection step in the detection packet transmission step, the port detection packet is transmitted again, and in the bubble packet transmission step, the bubble packet transmission step If the position of the bubble packet transmission port cannot be detected in the packet transmission port detection step, the bubble packet may be transmitted again.

Further, in this program, a port width detection packet transmission step for transmitting a port width detection packet for detecting a port width in the first communication control device to the computer via the first communication control device; Port width detection port information receiving step for receiving port width detection port information indicating the position of the port of the first communication control device through which the port width detection packet has passed, and the port received by the port width detection port information reception unit A port width detection step of detecting a port width in the first communication control device based on the width detection port information, and performing a first step detected in the port width detection step in the bubble packet transmission port detection step. The position of the bubble packet transmission port may be detected using the port width in the communication control device.

  The software that implements the information processing apparatus in each of the above embodiments is the following program. In other words, the program is sent to the computer via the first communication control device that controls communication of the first information processing device and the second communication control device that controls communication of the second information processing device. A program for executing processing in a first information processing apparatus that communicates with a second information processing apparatus, wherein the first communication control apparatus is connected to the second information processing apparatus via the second communication control apparatus. The bubble packet for leaving the transmission history is transmitted to the second communication control device, and the position of the reference port which is the port in the first communication control device serving as the reference of the bubble packet transmission target is determined. A reference port detection packet transmission step for transmitting a reference port detection packet for detection, and a second communication control device used in transmission of the bubble packet from the second information processing device A bubble packet transmission port reception step for receiving bubble packet transmission port information indicating the position of the bubble packet transmission port, which is a port, and a reply packet transmission step for transmitting a reply packet to the bubble packet transmission port indicated by the bubble packet transmission port information; , To execute.

  Further, in this program, in the reply packet transmission step, the reply packet may be transmitted using N different ports (N is an integer of 2 or more) of the first communication control device.

  In this program, N ports may be newly assigned in the first communication control apparatus when a reply packet is transmitted.

  In this program, N may be equal to or greater than the number of ports that can be assigned from the reference port to the port to which the bubble packet is transmitted in the first communication control apparatus.

  In this program, the computer further includes a re-reply packet accepting step for accepting a re-reply packet transmitted from the second information processing device to the port of the first communication control device used for transmitting the reply packet. Further, it may be executed.

  The program further includes a port width detection packet transmission step of transmitting, to the computer, a port width detection packet for detecting the port width in the first communication control device via the first communication control device. It may be executed.

  Further, in this program, a port width detection port information receiving step for receiving port width detection port information indicating the position of the port of the first communication control device through which the port width detection packet has passed, and port width detection A port width detection step for detecting a port width in the first communication control device based on the port width detection port information received in the port information reception step, and a first communication control device detected in the port width detection step. A port width transmission step of transmitting port width information, which is information indicating the port width, may be further executed.

The software that implements the server in the above embodiment is the following program. In other words, this program is stored in a computer in which the first information processing apparatus and the second information processing apparatus control communication of the first information processing apparatus, and the second information processing apparatus. A program for executing processing in a server for establishing communication performed via a second communication control device that controls communication of the first information processing in order to leave a transmission history in the first communication control device In order to detect the position of a reference port that is a port in the second communication control device that is a reference for transmission of bubble packets transmitted by the device, the second information processing device passes through the second communication control device. A reference port detection step for receiving the transmitted reference port detection packet and detecting the position of the reference port based on the reference port detection packet; and a reference port detection step. The reference port transmission step for transmitting the reference port information indicating the position of the reference port detected by the group to the first information processing apparatus and the transmission of the bubble packet from the first information processing apparatus to the second communication control apparatus. In order to detect the position of the bubble packet transmission port which is a port in the first communication control device, the port detection packet transmitted from the first information processing device is received and bubble packet transmission is performed based on the port detection packet. Bubble packet transmission port detecting step for detecting the position of the port, and bubble packet transmission port for transmitting bubble packet transmission port information indicating the position of the bubble packet transmission port detected in the bubble packet transmission port detecting step to the second information processing apparatus And a transmission step.

  In addition, in this program, if the position of the bubble packet transmission port cannot be detected in the bubble packet transmission port detection step, the retransmission instruction is an instruction to retransmit the bubble packet and the port detection packet. May be further executed in a retransmission instruction transmission step of transmitting the message to the first information processing apparatus.

  Further, in this program, in the bubble packet transmission port detection step, the port detection packet transmitted before and after the transmission of the bubble packet is received, and 2 in the first communication control device used in the transmission of the port detection packet. It is determined whether two ports and bubble packet transmission ports are continuous. If they are continuous, the position of the port sandwiched between the two ports may be detected as the position of the bubble packet transmission port.

  In this program, in the bubble packet transmission port detection step, the interval between the two ports in the first communication control device used for transmitting the port detection packet is twice the port width in the first communication control device. If it is, it may be determined that it is continuous.

  Further, in this program, the computer receives a first port width detection packet transmitted from the first information processing apparatus via the first communication control apparatus, and based on the first port width detection packet. The first port width detection step of detecting the port width in the first communication control device is further executed, and in the bubble packet transmission port detection step, a determination is made using the port width detected by the first port width detection unit. You may go.

  Further, in this program, the computer receives a second port width detection packet transmitted from the second information processing device via the second communication control device, and based on the second port width detection packet. A second port width detecting step for detecting the port width in the second communication control device, and port width information, which is information indicating the port width detected in the second port width detecting step, in the first information processing device. A port width transmission step of transmitting may be further executed.

Moreover, the software which implement | achieves the server in the said embodiment is the following programs. In other words, this program is stored in a computer in which the first information processing apparatus and the second information processing apparatus control communication of the first information processing apparatus, and the second information processing apparatus. A program for executing processing in a server for establishing communication performed via a second communication control device that controls communication of the first information processing in order to leave a transmission history in the first communication control device In order to detect the position of a reference port that is a port in the second communication control device that is a reference for transmission of bubble packets transmitted by the device, the second information processing device passes through the second communication control device. A reference port detection step for receiving the transmitted reference port detection packet and detecting the position of the reference port based on the reference port detection packet; and a reference port detection step. The reference port transmission step for transmitting the reference port information indicating the position of the reference port detected by the group to the first information processing apparatus and the transmission of the bubble packet from the first information processing apparatus to the second communication control apparatus. In order to detect the position of the bubble packet transmission port that is a port in the first communication control device, the port detection packet transmitted from the first information processing device is received, and the port detection is performed based on the port detection packet. A detection port detection step for detecting the position of the port of the first communication control device through which the packet for transmission has passed, and detection port information indicating the position of the port detected in the detection port detection step for the first information processing device And a detection port information transmission step for transmission.

  Moreover, the software which implement | achieves the information processing apparatus in each said embodiment is the following programs. That is, this program is a program for causing a computer to execute processing in an information processing apparatus, a communication control apparatus that controls communication of the information processing apparatus, and a communication system that includes a server. A bubble packet transmission step for transmitting a bubble packet for leaving a transmission history in the communication control device via the control device, and a position of the bubble packet transmission port which is a port of the communication control device used for transmitting the bubble packet is detected. A detection packet transmission step of transmitting the port detection packet used for the transmission to the server before and after transmitting the bubble packet in the bubble packet transmission step.

  Moreover, the software which implement | achieves the server in each said embodiment is the following programs. That is, this program is a program for causing a computer to execute processing in an information processing device, a communication control device that controls communication of the information processing device, and a server that constitutes a communication system including the server. In order to detect the position of the bubble packet transmission port, which is a port in the communication control device used in the transmission of the bubble packet transmitted by the information processing device in order to leave a transmission history, the information processing device before and after the transmission of the bubble packet. The step of receiving the transmitted port detection packet and the step of detecting the position of the bubble packet transmission port based on the port detection packet are executed.

  Moreover, the software which implement | achieves the server in each said embodiment is the following programs. That is, this program is a program for causing a computer to execute processing in an information processing device, a communication control device that controls communication of the information processing device, and a server that constitutes a communication system including the server. In order to detect the position of the bubble packet transmission port, which is a port in the communication control device used in the transmission of the bubble packet transmitted by the information processing device in order to leave a transmission history, the information processing device before and after the transmission of the bubble packet. Receiving the transmitted port detection packet; detecting the port position of the communication control device through which the port detection packet has passed; and detecting the port position of the communication control device through which the port detection packet has passed. Transmitting the port information to the information processing apparatus. It is those of the eye.

  In the above program, in a transmission step for transmitting information, a reception step for receiving information, etc., processing performed by hardware, for example, processing performed by a modem or an interface card in the transmission step (only performed by hardware). Not included).

  The program may be distributed by being downloaded from a server or the like, or distributed by being recorded on a predetermined recording medium (for example, an optical disk such as a CD-ROM, a magnetic disk, or a semiconductor memory). Also good.

  Further, the computer that executes this program may be singular or plural. That is, centralized processing may be performed, or distributed processing may be performed.

  As described above, the communication system or the like according to the present invention can establish communication between a plurality of information processing apparatuses via the communication control apparatus, and is useful as a communication between information processing apparatuses.

The block diagram which shows the structure of the communication system by Embodiment 1 of this invention. The block diagram which shows the structure of the 1st information processing apparatus by the embodiment The block diagram which shows the structure of the 2nd information processing apparatus by the embodiment The block diagram which shows the structure of the server by the embodiment The flowchart which shows the operation | movement of the communication system by the embodiment The figure for demonstrating the process regarding the establishment of communication in the embodiment The figure for demonstrating the detection of the port width in the embodiment The figure for demonstrating the process regarding the establishment of communication in the embodiment The figure for demonstrating the process regarding the establishment of communication in the embodiment The figure for demonstrating the specific example in the embodiment The figure for demonstrating the specific example in the embodiment The figure for demonstrating the specific example in the embodiment The figure for demonstrating the specific example in the embodiment The figure for demonstrating the specific example in the embodiment The figure for demonstrating the specific example in the embodiment The figure for demonstrating the specific example in the embodiment The figure which shows the combination of the characteristic of the communication control apparatus which can be connected in the embodiment The block diagram which shows the structure of the 1st information processing apparatus by Embodiment 2 of this invention. The block diagram which shows the structure of the 2nd information processing apparatus by the embodiment The block diagram which shows the structure of the server by the embodiment The figure for demonstrating the process regarding the establishment of communication in the embodiment The figure for demonstrating the process regarding the establishment of communication in the embodiment The figure for demonstrating the process regarding the establishment of communication in the embodiment The block diagram which shows the structure of the communication system by Embodiment 3 of this invention. The block diagram which shows the structure of the communication system by other embodiment. The block diagram which shows the structure of the communication system by Embodiment 4 of this invention. The block diagram which shows the structure of the 1st information processing apparatus by the embodiment The block diagram which shows the structure of the server by the embodiment The figure for demonstrating the process regarding the establishment of communication in the embodiment The figure for demonstrating the specific example in the embodiment The figure for demonstrating the specific example in the embodiment The figure for explaining the characteristic (type) of NAT The figure which shows an example of a communication system The figure which shows the combination of NAT which can be connected conventionally

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st information processing apparatus 2 2nd information processing apparatus 3 1st communication control apparatus 4 2nd communication control apparatus 5 Communication line 6 Server 11, 21, 61 Communication part 12 Reference | standard port reception part 13 Bubble packet transmission part DESCRIPTION OF SYMBOLS 14 Detection packet transmission part 15,26 Port width detection packet transmission part 16 Retransmission instruction | indication reception part 17 Reply packet reception part 18 Re-reply packet reception part 19 Port width reception part 22 Reference | standard port detection packet transmission part 23 Bubble packet transmission Port accepting unit 24 Reply packet transmitting unit 25 Reply packet accepting unit 62 Reference port detecting unit 63 Reference port transmitting unit 64 Port width detecting unit 65 Bubble packet transmitting port detecting unit 66 Retransmission instruction transmitting unit 67 Bubble packet transmitting port transmitting unit 68 Port width transmitter

Claims (88)

A first information processing apparatus; a second information processing apparatus; a first communication control apparatus that controls communication of the first information processing apparatus; and a second that controls communication of the second information processing apparatus. A communication control device and a server for establishing communication between the first information processing device and the second information processing device,
The first information processing apparatus includes:
Criteria for accepting reference port information indicating the position of a reference port that is a port in the second communication control device serving as a reference for transmission of a bubble packet transmitted to leave a transmission history in the first communication control device The port reception department,
A bubble packet transmission unit configured to transmit the bubble packet to the second communication control device via the first communication control device based on the reference port information;
A detection packet transmitter for transmitting a port detection packet to the server in order to detect a position of a bubble packet transmission port, which is a port of the first communication control device, used in the transmission of the bubble packet;
A reply packet accepting unit that accepts a reply packet transmitted from the second information processing device via the second communication control device to the bubble packet transmission port; ,
A reference port detection packet transmitter for transmitting a reference port detection packet for detecting the position of the reference port;
A bubble packet transmission port reception unit for receiving bubble packet transmission port information indicating the position of the bubble packet transmission port;
A reply packet transmitter that transmits a reply packet to the bubble packet transmission port indicated by the bubble packet transmission port information,
The server
A reference port detection unit that receives the reference port detection packet transmitted from the second information processing apparatus and detects the position of the reference port based on the reference port detection packet;
A reference port transmitter that transmits reference port information indicating the position of the reference port detected by the reference port detector to the first information processing apparatus;
A bubble packet transmission port detection unit that receives the port detection packet transmitted from the first information processing apparatus and detects a position of the bubble packet transmission port based on the port detection packet;
A bubble communication port transmission unit that transmits the bubble packet transmission port information to the second information processing apparatus. The server
If the bubble packet transmission port detection unit cannot detect the position of the bubble packet transmission port, a retransmission instruction that is an instruction to retransmit the bubble packet and the port detection packet is sent to the first packet packet. A retransmission instruction transmission unit for transmitting to the information processing apparatus;
The first information processing apparatus includes:
A retransmission instruction receiving unit that receives the retransmission instruction transmitted from the server; and the detection packet transmitting unit is configured to detect the port when the retransmission instruction receiving unit receives the retransmission instruction. Send the packet again to the server,
The communication system according to claim 1, wherein the bubble packet transmission unit transmits the bubble packet to the server again when the retransmission instruction reception unit receives the retransmission instruction. The first information processing apparatus includes:
When the reply packet accepting unit accepts the reply packet, the reply packet transmitting unit further transmits a reply packet to the port of the second communication control device used for transmitting the reply packet. Prepared,
The second information processing apparatus
The communication system according to claim 1, further comprising a re-reply packet accepting unit that accepts the re-reply packet. Communication with the second information processing device via a first communication control device that controls communication of the first information processing device and a second communication control device that controls communication of the second information processing device The first information processing apparatus,
Criteria for accepting reference port information indicating the position of a reference port that is a port in the second communication control device serving as a reference for transmission of a bubble packet transmitted to leave a transmission history in the first communication control device The port reception department,
A bubble packet transmission unit configured to transmit the bubble packet to the second communication control device via the first communication control device based on the reference port information;
A detection packet transmitter for transmitting a port detection packet to detect a position of a bubble packet transmission port, which is a port of the first communication control device, used in the transmission of the bubble packet;
A first information processing apparatus comprising: a reply packet receiving unit that receives a reply packet transmitted from the second information processing apparatus via the second communication control apparatus to the bubble packet transmission port. The reference port is the latest at the time when a reference port detection packet for detecting the position of the reference port is transmitted from the second information processing device among the ports assigned by the second communication control device. The first information processing apparatus according to claim 4, wherein the first information processing apparatus is a port. 6. The first information processing apparatus according to claim 4, wherein the detection packet transmission unit transmits the port detection packet before and after the bubble packet transmission unit transmits the bubble packet. The first information processing apparatus according to claim 6, wherein the bubble packet and the port detection packet are transmitted using different ports in the first communication control apparatus. The first information processing apparatus according to claim 7, wherein the bubble packet and the port detection packet are transmitted using a port newly assigned in the first information processing apparatus. A retransmission instruction receiving unit that receives a retransmission instruction to retransmit the bubble packet and the port detection packet;
When the retransmission instruction receiving unit receives the retransmission instruction, the detection packet transmitting unit transmits the port detection packet again,
The first information processing apparatus according to claim 4, wherein the bubble packet transmission unit transmits the bubble packet again when the retransmission instruction reception unit receives the retransmission instruction. 5. The port width detection packet transmitting unit further transmits a port width detection packet for detecting a port width in the first communication control device via the first communication control device. The first information processing apparatus. 5. The first port according to claim 4, wherein a bubble packet transmission target port that is a target port for transmitting the bubble packet in the second communication control device is a port assigned after a predetermined port assignment from the reference port. Information processing device. A port width receiving unit that receives port width information that is information indicating a port width in the second communication control device;
The bubble packet transmission unit transmits the bubble packet to the bubble packet transmission target port whose port interval with the reference port is M times the port width indicated by the port width information (M is an integer of 1 or more). The first information processing apparatus according to claim 11, which transmits the first information processing apparatus. When the reply packet accepting unit accepts the reply packet, the reply packet transmitting unit further transmits a reply packet to the port of the second communication control device used for transmitting the reply packet. The first information processing apparatus according to claim 4 provided. Communication with the second information processing device via a first communication control device that controls communication of the first information processing device and a second communication control device that controls communication of the second information processing device The first information processing apparatus,
The first communication control device transmits a bubble packet for leaving a transmission history to the second communication control device from the second information processing device via the second communication control device. Yes,
A reference port detection packet transmitter for transmitting a reference port detection packet for detecting a position of a reference port that is a port in the first communication control device that is a reference for transmission of the bubble packet;
Bubble packet transmission port reception for receiving bubble packet transmission port information indicating the position of the bubble packet transmission port, which is a port of the second communication control device, used for transmission of the bubble packet from the second information processing apparatus And
A first information processing apparatus comprising: a reply packet transmission unit that transmits a reply packet to the bubble packet transmission port indicated by the bubble packet transmission port information. The first information processing apparatus according to claim 14, wherein the reply packet transmitting unit transmits the reply packet using N different ports (N is an integer of 2 or more) of the first communication control apparatus. . 16. The first information processing apparatus according to claim 15, wherein the N ports are newly allocated in the first communication control apparatus when the reply packet is transmitted. 17. The first information processing apparatus according to claim 15, wherein N is equal to or more than a number of ports that can be allocated from the reference port to a port to which the bubble packet is transmitted in the first communication control apparatus. . The apparatus further comprises a re-reply packet accepting unit that accepts a re-reply packet transmitted from the second information processing device to the port of the first communication control device used for transmitting the reply packet. 14. The first information processing apparatus according to 14. The port width detection packet transmitting unit for transmitting a port width detection packet for detecting a port width in the first communication control device via the first communication control device. The first information processing apparatus. The first information processing device and the second information processing device are a first communication control device that controls communication of the first information processing device, and a second that controls communication of the second information processing device. A server that establishes communication through the communication control device of
Position of a reference port that is a port in the second communication control device that is a reference for transmission of a bubble packet transmitted by the first information processing device in order to leave a transmission history in the first communication control device In order to detect the reference port detection packet transmitted from the second information processing apparatus via the second communication control apparatus, the position of the reference port is determined based on the reference port detection packet. A reference port detector to detect;
A reference port transmitter that transmits reference port information indicating the position of the reference port detected by the reference port detector to the first information processing apparatus;
In order to detect a position of a bubble packet transmission port that is a port in the first communication control device used in transmission of the bubble packet from the first information processing device to the second communication control device, A bubble packet transmission port detection unit that receives a port detection packet transmitted from one information processing apparatus and detects a position of the bubble packet transmission port based on the port detection packet;
A server comprising: a bubble packet transmission port transmission unit configured to transmit bubble packet transmission port information indicating a position of the bubble packet transmission port detected by the bubble packet transmission port detection unit to the second information processing apparatus. When the bubble packet transmission port detection unit cannot detect the position of the bubble packet transmission port, a retransmission instruction that is an instruction to retransmit the bubble packet and the port detection packet is sent to the first packet. 21. The server according to claim 20, further comprising a retransmission instruction transmission unit that transmits to the information processing apparatus. The bubble packet transmission port detection unit receives the port detection packet transmitted before and after transmission of the bubble packet, and uses two ports in the first communication control device used in transmission of the port detection packet. And when the bubble packet transmission port is continuous, the position of the port sandwiched between the two ports is detected as the position of the bubble packet transmission port. Or the server according to 21. In the bubble packet transmission port detection unit, an interval between two ports in the first communication control device used for transmitting the port detection packet is twice a port width in the first communication control device. 23. The server of claim 22, wherein the server determines that the server is continuous. A first port width detection packet transmitted from the first information processing apparatus via the first communication control apparatus is received, and the first communication control is performed based on the first port width detection packet. A first port width detection unit for detecting a port width in the apparatus;
The server according to claim 23, wherein the bubble packet transmission port detection unit makes the determination using the port width detected by the first port width detection unit. Receiving a second port width detection packet transmitted from the second information processing apparatus via the second communication control apparatus, and performing the second communication control based on the second port width detection packet; A second port width detector for detecting a port width in the apparatus;
21. The server according to claim 20, further comprising: a port width transmission unit that transmits port width information, which is information indicating the port width detected by the second port width detection unit, to the first information processing apparatus. . The first information processing device and the second information processing device are a first communication control device that controls communication of the first information processing device, and a second that controls communication of the second information processing device. A communication method for performing communication via the communication control device of
The position of a reference port that is a port in the second communication control device, which is a reference for transmission of a bubble packet transmitted by the first information processing device in order to leave a transmission history in the first communication control device. A reference port detection packet transmission step in which the second information processing device transmits a reference port detection packet for detection via the second communication control device;
A reference port detection step of receiving the reference port detection packet and detecting a position of the reference port;
A reference port transmission step of transmitting reference port information which is information indicating a position of the reference port detected in the reference port detection step;
A reference port receiving step for receiving the reference port information;
The first information processing apparatus transmits the bubble packet to the second communication control apparatus via the first communication control apparatus based on the reference port information received in the reference port reception step. A packet transmission step;
The bubble packet transmission port detection step for detecting a position of a bubble packet transmission port which is a port of the first communication control device used in the transmission of the bubble packet;
A bubble packet transmission port transmission step of transmitting bubble packet transmission port information indicating a position of the bubble packet transmission port detected in the bubble packet transmission port detection step;
A bubble packet transmission port reception step for receiving the bubble packet transmission port information;
A reply method comprising: a reply step of sending a reply packet from the second information processing apparatus to the bubble packet transmission port indicated by the bubble packet transmission port information accepted in the bubble packet transmission port acceptance step. The bubble packet transmission port detection step includes:
Before transmitting the bubble packet, the first information processing apparatus transmits a first port detection packet for specifying the bubble packet transmission port via the first communication control apparatus. Sending step,
A first detection step of accepting the first port detection packet and detecting a position of a first port which is a port of the first communication control device used in transmission of the first port detection packet. When,
After the bubble packet is transmitted, a second port detection packet for specifying the bubble packet transmission port is transmitted from the first information processing apparatus via the first communication control apparatus. Sending step;
A second detection step of accepting the second port detection packet and detecting a position of a second port which is a port of the first communication control device used in transmission of the second port detection packet; When,
27. A communication method according to claim 26, further comprising a port detection step of detecting a position of the bubble packet transmission port based on a position of the first port and a position of the second port. The bubble packet transmission port detection step includes:
A determination step of determining whether the first port and the second port whose positions are detected in the first detection step and the second detection step are continuous with the bubble packet transmission port. Further comprising
28. The communication method according to claim 27, wherein, in the port detection step, the position of the bubble packet transmission port is detected when it is determined that the determination is continued in the determination step. If it is determined in the determination step that the transmission is not continuous, the first transmission step, the first detection step, the bubble packet transmission step, the second transmission step, the second detection step, 29. The communication method according to claim 28, wherein the determination step is repeated until it is determined that the determination step is continuous. The first information processing apparatus further includes a first address acquisition step of acquiring an address of the second communication control apparatus;
30. The communication method according to claim 26, wherein, in the bubble packet transmission step, the bubble packet is transmitted to the address acquired in the first address acquisition step. The second information processing apparatus further includes a second address acquisition step of acquiring an address of the first communication control apparatus;
27. The communication method according to claim 26, wherein, in the reply step, the reply packet is transmitted to the address acquired in the second address acquisition step. If communication between the first information processing apparatus and the second information processing apparatus cannot be established due to the transmission of the reply packet in the reply step, the process of each step is executed again. The communication method according to claim 26. A reply accepting step for accepting the reply packet;
When the reply packet is accepted in the reply accepting step, the first information processing apparatus sends a re-reply packet to the port of the second communication control apparatus used for transmitting the reply packet. 27. The communication method according to claim 26, further comprising a re-reply step for transmitting. If communication between the first information processing apparatus and the second information processing apparatus cannot be established due to the transmission of the re-reply packet in the re-reply step, the process of each step is performed again. The communication method according to claim 33, wherein: On the computer,
Communication with the second information processing device via a first communication control device that controls communication of the first information processing device and a second communication control device that controls communication of the second information processing device A program for executing processing in the first information processing apparatus,
Criteria for accepting reference port information indicating the position of a reference port that is a port in the second communication control device serving as a reference for transmission of a bubble packet transmitted to leave a transmission history in the first communication control device A port reception step;
A bubble packet transmitting step of transmitting the bubble packet to the second communication control device via the first communication control device based on the reference port information;
A detection packet transmission step of transmitting a port detection packet to detect a position of a bubble packet transmission port, which is a port of the first communication control device, used in the transmission of the bubble packet;
A program for causing the bubble packet transmission port to execute a reply packet accepting step of accepting a reply packet transmitted from the second information processing apparatus via the second communication control apparatus. The reference port is the latest at the time when a reference port detection packet for detecting the position of the reference port is transmitted from the second information processing device among the ports assigned by the second communication control device. 36. The program according to claim 35, wherein the program is a port. 37. The program according to claim 35, wherein in the detection packet transmission step, the port detection packet is transmitted before and after transmitting the bubble packet in the bubble packet transmission step. 38. The program according to claim 37, wherein the bubble packet and the port detection packet are transmitted using different ports in the first communication control apparatus. 39. The program according to claim 38, wherein the bubble packet and the port detection packet are transmitted using a port newly assigned in the first information processing apparatus. On the computer,
Further executing a retransmission instruction receiving step for receiving a retransmission instruction for retransmitting the bubble packet and the port detection packet;
In the detection packet transmission step, when the retransmission instruction is received in the retransmission instruction reception step, the port detection packet is transmitted again,
36. The program according to claim 35, wherein, in the bubble packet transmission step, the bubble packet is transmitted again when the retransmission instruction is received in the retransmission instruction reception step. On the computer,
The port width detection packet transmitting step of transmitting a port width detection packet for detecting a port width in the first communication control device via the first communication control device is further executed. 35. The program according to 35. 36. The program according to claim 35, wherein a bubble packet transmission target port that is a target port for transmitting the bubble packet in the second communication control device is a port assigned after a predetermined port assignment from the reference port. On the computer,
A port width receiving step of receiving port width information that is information indicating a port width in the second communication control device;
In the bubble packet transmission step, the bubble packet is transmitted to the bubble packet transmission target port whose port interval with the reference port is M times the port width indicated by the port width information (M is an integer of 1 or more). The program according to claim 42, which is transmitted. On the computer,
A re-reply packet transmitting step of transmitting a re-reply packet to the port of the second communication control device used for transmitting the reply packet when the reply packet is accepted in the reply packet accepting step; 36. The program according to claim 35, for execution. On the computer,
Communication with the second information processing device via a first communication control device that controls communication of the first information processing device and a second communication control device that controls communication of the second information processing device A program for executing processing in the first information processing apparatus,
The first communication control device transmits a bubble packet for leaving a transmission history to the second communication control device from the second information processing device via the second communication control device. Yes,
A reference port detection packet transmission step of transmitting a reference port detection packet for detecting a position of a reference port which is a port in the first communication control device serving as a reference for transmission of the bubble packet;
Bubble packet transmission port reception for receiving bubble packet transmission port information indicating the position of the bubble packet transmission port, which is a port of the second communication control device, used for transmission of the bubble packet from the second information processing apparatus Steps,
A reply packet transmission step of transmitting a reply packet to the bubble packet transmission port indicated by the bubble packet transmission port information. 46. The program according to claim 45, wherein in the reply packet transmission step, the reply packet is transmitted using N different ports (N is an integer of 2 or more) of the first communication control device. 47. The program according to claim 46, wherein the N ports are newly allocated in the first communication control device when the reply packet is transmitted. 48. The program according to claim 46 or 47, wherein N is equal to or more than a number of ports that can be allocated from the reference port to a port to which the bubble packet is transmitted in the first communication control apparatus. On the computer,
In order to further execute a re-reply packet accepting step of accepting a re-reply packet transmitted from the second information processing device to the port of the first communication control device used in the transmission of the reply packet. The program according to claim 45. On the computer,
The port width detection packet transmitting step for transmitting a port width detection packet for detecting a port width in the first communication control device via the first communication control device is further executed. 45. The program according to 45. On the computer,
The first information processing device and the second information processing device are a first communication control device that controls communication of the first information processing device, and a second that controls communication of the second information processing device. A program for executing processing in a server for establishing communication performed via the communication control device of
The position of a reference port that is a port in the second communication control device, which is a reference for transmission of a bubble packet transmitted by the first information processing device in order to leave a transmission history in the first communication control device. To detect, a reference port detection packet transmitted from the second information processing device via the second communication control device is received, and the position of the reference port is detected based on the reference port detection packet A reference port detection step,
A reference port transmission step of transmitting reference port information indicating the position of the reference port detected in the reference port detection step to the first information processing apparatus;
In order to detect a position of a bubble packet transmission port that is a port in the first communication control device used in transmission of the bubble packet from the first information processing device to the second communication control device, A bubble packet transmission port detection step for receiving a port detection packet transmitted from one information processing apparatus and detecting the position of the bubble packet transmission port based on the port detection packet;
A bubble packet transmission port transmission step for transmitting bubble packet transmission port information indicating the position of the bubble packet transmission port detected in the bubble packet transmission port detection step to the second information processing apparatus. A first information processing apparatus; a second information processing apparatus; a first communication control apparatus that controls communication of the first information processing apparatus; and a second that controls communication of the second information processing apparatus. A communication control device and a server for establishing communication between the first information processing device and the second information processing device,
The first information processing apparatus includes:
Criteria for accepting reference port information indicating the position of a reference port that is a port in the second communication control device serving as a reference for transmission of a bubble packet transmitted to leave a transmission history in the first communication control device The port reception department,
A bubble packet transmission unit configured to transmit the bubble packet to the second communication control device via the first communication control device based on the reference port information;
A detection packet transmitter for transmitting a port detection packet to the server in order to detect a position of a bubble packet transmission port, which is a port of the first communication control device, used in the transmission of the bubble packet;
A reply packet accepting unit that accepts a reply packet transmitted from the second information processing device to the bubble packet transmission port via the second communication control device;
A detection port information receiving unit that receives detection port information indicating a port position of the first communication control device through which the port detection packet has passed;
A bubble packet transmission port detection unit for detecting a position of the bubble packet transmission port based on the detection port information received by the detection port information reception unit;
A bubble packet transmission port transmission unit that transmits bubble packet transmission port information indicating the position of the bubble packet transmission port detected by the bubble packet transmission port detection unit to the second information processing apparatus via the server; The second information processing apparatus comprises
A reference port detection packet transmitter for transmitting a reference port detection packet for detecting the position of the reference port to a server;
A bubble packet transmission port reception unit for receiving bubble packet transmission port information indicating the position of the bubble packet transmission port;
A reply packet transmitter that transmits a reply packet to the bubble packet transmission port indicated by the bubble packet transmission port information,
The server
A reference port detection unit that receives the reference port detection packet transmitted from the second information processing apparatus and detects the position of the reference port based on the reference port detection packet;
A reference port transmitter that transmits reference port information indicating the position of the reference port detected by the reference port detector to the first information processing apparatus;
Detection that receives the port detection packet transmitted from the first information processing device and detects the position of the port of the first communication control device through which the port detection packet has passed based on the port detection packet Port detection unit,
And a detection port information transmission unit configured to transmit detection port information indicating a position of the port detected by the detection port detection unit to the first information processing apparatus. A detection port information receiving unit that receives detection port information indicating a port position of the first communication control device through which the port detection packet has passed;
A bubble packet transmission port detection unit for detecting a position of the bubble packet transmission port based on the detection port information received by the detection port information reception unit;
5. The first information processing according to claim 4, further comprising: a bubble packet transmission port transmission unit that transmits bubble packet transmission port information indicating a position of the bubble packet transmission port detected by the bubble packet transmission port detection unit. apparatus. The bubble packet transmission port detection unit, when the position of the bubble packet transmission port cannot be detected, passes an instruction to the packet transmission unit for detection to transmit the port detection packet again, and the bubble packet Give an instruction to transmit again to the bubble packet transmitter,
The detection packet transmitter transmits the port detection packet again according to the instruction,
54. The first information processing apparatus according to claim 53, wherein the bubble packet transmitting unit transmits the bubble packet again in response to the instruction. A port width detection packet for detecting a port width in the first communication control device;
A port width detection packet transmitter for transmitting via the first communication control device;
A port width detection port information receiving unit for receiving port width detection port information indicating the position of the port of the first communication control device through which the port width detection packet has passed;
A port width detection unit that detects a port width in the first communication control device based on the port width detection port information received by the port width detection port information reception unit;
55. The first of claim 53 or 54, wherein the bubble packet transmission port detection unit detects a position of the bubble packet transmission port using a port width in the first communication control device detected by the port width detection unit. Information processing device. A port width detection port information receiving unit for receiving port width detection port information indicating the position of the port of the first communication control device through which the port width detection packet has passed;
A port width detection unit for detecting a port width in the first communication control device based on the port width detection port information received by the port width detection port information reception unit;
The first information processing according to claim 19, further comprising: a port width transmission unit that transmits port width information that is information indicating a port width in the first communication control device detected by the port width detection unit. apparatus. The first information processing device and the second information processing device are a first communication control device that controls communication of the first information processing device, and a second that controls communication of the second information processing device. A server that establishes communication through the communication control device of
The position of a reference port that is a port in the second communication control device, which is a reference for transmission of a bubble packet transmitted by the first information processing device in order to leave a transmission history in the first communication control device. To detect, a reference port detection packet transmitted from the second information processing device via the second communication control device is received, and the position of the reference port is detected based on the reference port detection packet A reference port detector to
A reference port transmitter that transmits reference port information indicating the position of the reference port detected by the reference port detector to the first information processing apparatus;
In order to detect a position of a bubble packet transmission port that is a port in the first communication control device used in transmission of the bubble packet from the first information processing device to the second communication control device, Detection port detection for receiving a port detection packet transmitted from one information processing device and detecting the position of the port of the first communication control device through which the port detection packet has passed based on the port detection packet And
A detection port information transmission unit configured to transmit detection port information indicating a position of the port detected by the detection port detection unit to the first information processing apparatus; The first port width detection packet transmitted from the first information processing apparatus via the first communication control apparatus is received, and the first port width is determined based on the first port width detection packet. A first port width detection port detector for detecting the position of the port of the first communication control device through which the detection packet has passed;
A first port width detection port information transmission unit for transmitting port width detection port information indicating the position of the port detected by the first port width detection port detection unit to the first information processing apparatus; 58. The server of claim 57, further comprising: Receiving a second port width detection packet transmitted from the second information processing apparatus via the second communication control apparatus, and based on the second port width detection packet, the second port width A second port width detection port detection unit for detecting the position of the port of the second communication control device through which the detection packet has passed;
A second port width detection port information transmission unit for transmitting port width detection port information indicating the position of the port detected by the second port width detection port detection unit to the second information processing apparatus; 59. The server according to claim 57 or 58, further comprising: On the computer,
A detection port information reception step for receiving detection port information indicating a port position of the first communication control device through which the port detection packet has passed;
A bubble packet transmission port detection step for detecting the position of the bubble packet transmission port based on the detection port information received in the detection port information reception step;
36. The program according to claim 35, further causing a bubble packet transmission port transmission step of transmitting bubble packet transmission port information indicating a position of the bubble packet transmission port detected in the bubble packet transmission port detection step. In the detection packet transmission step, when the position of the bubble packet transmission port could not be detected in the bubble packet transmission port detection step, the port detection packet is transmitted again,
61. The program according to claim 60, wherein in the bubble packet transmission step, the bubble packet is transmitted again when the position of the bubble packet transmission port cannot be detected in the bubble packet transmission port detection step. On the computer,
A port width detection packet transmitting step for transmitting a port width detection packet for detecting a port width in the first communication control device via the first communication control device;
A port width detection port information receiving step for receiving port width detection port information indicating the position of the port of the first communication control device through which the port width detection packet has passed;
A port width detection step of detecting a port width in the first communication control device based on the port width detection port information received by the port width detection port information receiving unit;
62. The program according to claim 60, wherein, in the bubble packet transmission port detection step, the position of the bubble packet transmission port is detected using the port width in the first communication control device detected in the port width detection step. On the computer,
A port width detection port information receiving step for receiving port width detection port information indicating the position of the port of the first communication control device through which the port width detection packet has passed;
Based on the port width detection port information received in the port width detection port information reception step, a port width detection step for detecting a port width in the first communication control device, and the port width detection step detected by the port width detection step 51. The program according to claim 50, further causing a port width transmission step of transmitting port width information that is information indicating a port width in the first communication control device. On the computer,
The first information processing device and the second information processing device are a first communication control device that controls communication of the first information processing device, and a second that controls communication of the second information processing device. A program for executing processing in a server for establishing communication performed via the communication control device of
The position of a reference port that is a port in the second communication control device, which is a reference for transmission of a bubble packet transmitted by the first information processing device in order to leave a transmission history in the first communication control device. To detect, a reference port detection packet transmitted from the second information processing device via the second communication control device is received, and the position of the reference port is detected based on the reference port detection packet A reference port detection step,
A reference port transmission step of transmitting reference port information indicating the position of the reference port detected in the reference port detection step to the first information processing apparatus;
In order to detect a position of a bubble packet transmission port that is a port in the first communication control device used in transmission of the bubble packet from the first information processing device to the second communication control device, Detection port detection for receiving a port detection packet transmitted from one information processing device and detecting the position of the port of the first communication control device through which the port detection packet has passed based on the port detection packet Steps,
A detection port information transmission step of transmitting detection port information indicating the position of the port detected in the detection port detection step to the first information processing apparatus. A communication system comprising an information processing device, a communication control device for controlling communication of the information processing device, and a server,
The information processing apparatus includes:
A bubble packet transmitter for transmitting a bubble packet for leaving a transmission history in the communication control device via the communication control device;
Before and after the bubble packet transmission unit transmits the bubble packet, the port detection packet used for detecting the position of the bubble packet transmission port, which is the port of the communication control device, is used in the transmission of the bubble packet. And a detection packet transmitter for transmitting to the server. 66. The communication system according to claim 65, wherein the bubble packet and the port detection packet are transmitted using a port newly assigned in the information processing apparatus. The server
67. A bubble packet transmission port detection unit that receives the port detection packet transmitted from the information processing apparatus and detects a position of the bubble packet transmission port based on the port detection packet. Communications system. The server
68. The communication system according to claim 67, further comprising a bubble packet transmission port transmission unit configured to transmit bubble packet transmission port information indicating a position of the bubble packet transmission port. The server
When the bubble packet transmission port detection unit cannot detect the position of the bubble packet transmission port, the information processing apparatus receives a retransmission instruction that is an instruction to retransmit the bubble packet and the port detection packet. A retransmission instruction transmission unit for transmitting to
The information processing apparatus includes:
A retransmission instruction receiving unit that receives the retransmission instruction transmitted from the server; and the detection packet transmitting unit is configured to detect the port when the retransmission instruction receiving unit receives the retransmission instruction. Send the packet again to the server,
68. The communication system according to claim 67, wherein the bubble packet transmission unit transmits the bubble packet to the server again when the retransmission instruction reception unit receives the retransmission instruction. 68. The communication system according to claim 67, wherein the bubble packet transmission port detection unit detects a position of the bubble packet transmission port using a port width of the communication control device. The information processing apparatus includes:
A port width detection packet transmitter for transmitting the port width detection packet for detecting the port width in the communication control device via the communication control device;
The server
A port width detection unit that receives the port width detection packet and detects the port width of the communication control device based on the port width detection packet;
The communication system according to claim 70, wherein the bubble packet transmission port detection unit detects the position of the bubble packet transmission port using the port width detected by the port width detection unit. The information processing apparatus includes:
A detection port information receiving unit that receives detection port information indicating a port position of the communication control device through which the port detection packet has passed;
A bubble packet transmission port detection unit that detects a position of the bubble packet transmission port based on the detection port information received by the detection port information reception unit;
The server
A detection port detection unit that receives the port detection packet and detects the position of the port of the communication control device through which the port detection packet has passed;
67. The communication system according to claim 65 or 66, further comprising: a detection port information transmission unit that transmits detection port information indicating a position of the port detected by the detection port detection unit to the information processing apparatus. The information processing apparatus includes:
75. The communication system according to claim 72, further comprising a bubble packet transmission port transmission unit that transmits bubble packet transmission port information indicating a position of the bubble packet transmission port. When the bubble packet transmission port detector cannot detect the position of the bubble packet transmission port, the detection packet transmitter transmits the port detection packet again,
The communication system according to claim 72, wherein the bubble packet transmission unit transmits the bubble packet again when the bubble packet transmission port detection unit cannot detect the position of the bubble packet transmission port. The communication system according to claim 72, wherein the bubble packet transmission port detection unit detects a position of the bubble packet transmission port using a port width of the communication control device. The information processing apparatus includes:
A port width detection packet transmitter for transmitting a port width detection packet for detecting a port width in the communication control device via the communication control device;
A port width detection port information receiving unit for receiving port width detection port information indicating a port position of the communication control device through which the port width detection packet has passed;
A port width detection unit that detects a port width in the communication control device based on the port width detection port information received by the port width detection port information reception unit;
The server
A port width detection port detection unit that receives the port width detection packet and detects a port position of the communication control device through which the port width detection packet has passed;
A port width detection port information transmission unit that transmits port width detection port information indicating the position of the port detected by the port width detection port detection unit to the information processing apparatus;
The communication system according to claim 75, wherein the bubble packet transmission port detection unit detects a position of the bubble packet transmission port using a port width of the communication control device detected by the port width detection unit. A bubble packet transmission port reception unit for receiving the bubble packet transmission port information;
A reply packet transmission unit that transmits a reply packet to the bubble packet transmission port indicated by the bubble packet transmission port information;
The information processing apparatus includes:
74. The communication system according to claim 73, further comprising a reply packet accepting unit that accepts a reply packet transmitted from the second information processing apparatus. 68. An information processing apparatus constituting the communication system according to claim 65. 78. A second information processing apparatus constituting the communication system according to claim 77. 68. A server constituting the communication system according to claim 65. An information processing apparatus, a communication control apparatus for controlling communication of the information processing apparatus, and a communication method used in the information processing apparatus constituting a communication system including a server,
A bubble packet transmitting step for transmitting a bubble packet for leaving a transmission history in the communication control device via the communication control device;
Before and after transmitting the bubble packet in the bubble packet transmission step, the port detection packet used for detecting the position of the bubble packet transmission port, which is the port of the communication control device, is used in the transmission of the bubble packet. And a detection packet transmitting step for transmitting to the server. A detection port information receiving step for receiving detection port information indicating a port position of the communication control device through which the port detection packet has passed;
84. The communication method according to claim 81, further comprising: a bubble packet transmission port detection step for detecting a position of the bubble packet transmission port based on the detection port information received in the detection port information reception step. 83. The communication method according to claim 82, further comprising a bubble packet transmission port transmission step for transmitting bubble packet transmission port information indicating a position of the bubble packet transmission port detected in the bubble packet transmission port detection step. An information processing apparatus, a communication control apparatus for controlling communication of the information processing apparatus, and a communication method used in the server constituting a communication system including a server,
The transmission of the bubble packet to detect the position of the bubble packet transmission port which is a port in the communication control device used in the transmission of the bubble packet transmitted by the information processing device to leave a transmission history in the communication control device Receiving a port detection packet transmitted from the information processing apparatus before and after
Detecting a position of the bubble packet transmission port based on the port detection packet. An information processing apparatus, a communication control apparatus for controlling communication of the information processing apparatus, and a communication method used in the server constituting a communication system including a server,
The transmission of the bubble packet to detect the position of the bubble packet transmission port which is a port in the communication control device used in the transmission of the bubble packet transmitted by the information processing device to leave a transmission history in the communication control device Receiving a port detection packet transmitted from the information processing apparatus before and after
Detecting the position of the port of the communication control device through which the port detection packet has passed;
And transmitting to the information processing apparatus detection port information indicating a port position of the communication control apparatus through which the port detection packet has passed. On the computer,
An information processing apparatus, a communication control apparatus that controls communication of the information processing apparatus, and a program for executing processing in the information processing apparatus that constitutes a communication system including a server,
A bubble packet transmitting step for transmitting a bubble packet for leaving a transmission history in the communication control device via the communication control device;
Before and after transmitting the bubble packet in the bubble packet transmission step, the port detection packet used for detecting the position of the bubble packet transmission port, which is the port of the communication control device, is used in the transmission of the bubble packet. And a detection packet transmission step to be transmitted to the server. On the computer,
An information processing apparatus, a communication control apparatus for controlling communication of the information processing apparatus, and a program for executing processing in the server constituting a communication system including a server,
The transmission of the bubble packet to detect the position of the bubble packet transmission port which is a port in the communication control device used in the transmission of the bubble packet transmitted by the information processing device to leave a transmission history in the communication control device Receiving a port detection packet transmitted from the information processing apparatus before and after
Detecting a position of the bubble packet transmission port based on the port detection packet. On the computer,
An information processing apparatus, a communication control apparatus for controlling communication of the information processing apparatus, and a program for executing processing in the server constituting a communication system including a server,
The transmission of the bubble packet to detect the position of the bubble packet transmission port which is a port in the communication control device used in the transmission of the bubble packet transmitted by the information processing device to leave a transmission history in the communication control device Receiving a port detection packet transmitted from the information processing apparatus before and after
Detecting the position of the port of the communication control device through which the port detection packet has passed;
Transmitting the port information for detection indicating the position of the port of the communication control device through which the port detection packet has passed to the information processing device.

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