JP2004104357A - Network system and communication method, information processing apparatus and method therefor, as well as program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a streaming communication via the Internet by using a router having a NAT (network address translation) function. <P>SOLUTION: A client 120 inquires of a client 200 the global IP (internet protocol) address and port of the router 180. The router 180 converts the address of the transmission source of the packet inquired by the client 120 to the global IP address and the port for transmitting. The client 200 extracts the address of the transmission source of the received packet as the global IP address and port of the router 180, and describes the address of the transmission source of the received packet to a response packet for transmitting to the client 120. The client 120 acquires the global IP address and port contained in response. The method and the system are applied to personal computers. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a network system and a communication method, an information processing apparatus and a method, and a program, and more particularly, to a network system and a network system capable of performing streaming communication via the Internet using a router having a NAT function. The present invention relates to a communication method, an information processing device and method, and a program.
[0002]
[Prior art]
When connecting a plurality of computers to the Internet, each computer is often connected to the Internet via a router. Some routers use NAT (Network Address Translation) which is a technique for sharing one global IP (Internet Protocol) address (global IP address which is unique information) among a plurality of computers.
[0003]
NATs are broadly divided into three types: Full Cone NAT, Restricted Cone NAT, and Port Restricted Cone NAT.
[0004]
FIG. 1 shows a configuration example of a network to which a router having a function of Full Cone NAT is connected.
[0005]
The client 1 determines that the local address (local address which is unique information (within a limited range) in a local network) is aa. aa. aa. aa is allocated and connected to the router 2 via the port bbb (hereinafter, such a state is described as aa.aa.aa.aa: bbb). The port number is used as identification information for identifying a service in the router 2. The client 1 communicates with another device (the servers 3 and 4 in this example) from the router 2 via the Internet (not shown). The router 2 has a function of Full Cone NAT, and has a global address (specific information that is information specific to the router 2) as tt. tt. tt. tt is assigned to the server 3 and the server 4 via the port sss (tt.tt.tt.tt:sss). The server 3 sets xx.xx as the global address. xx. xx. xx are assigned, and the ports yyy and zzz are assigned to the port tt. tt. tt. tt :: sss (xx.xx.xx.xx: yyy, xx.xx.xx.xx: zzz). In addition, the server 4 determines that the pp. pp. pp. pp is assigned, and port qqq is the port tt. tt. tt. tt :: sss (pp.pp.pp.pp: qqq).
[0006]
Since the router 2 has the function of Full Cone NAT, the port aa. aa. aa. aa: bbb is transmitted to the port tt. tt. tt. From tt: sss, the packet is transmitted to the specified port (in the example of FIG. 1, the port xx.xx.xx.xx: yyy), and the port tt. tt. tt. tt: All packets transmitted to sss are sent to port aa. aa. aa. aa: Transfer to bbb. Therefore, the port xx. xx. xx. xx: yyy or port xx. xx. xx. xx: zzz, or the port pp. pp. pp. pp: qqq, the port aa. aa. aa. aa: bbb.
[0007]
FIG. 2 shows a configuration example of a network to which a router having a function of Restricted Cone NAT is connected.
[0008]
In the example of FIG. 2, unlike the router 2 (router having the function of Full Cone NAT) of FIG. 1, the router 11 has the function of Restricted Cone NAT. Only the packet from the server having the global address (the server 3 in the case of FIG. 2) is received and transferred to the client 1. Accordingly, communication from the server 4 to the client 1 is restricted as shown by a dotted line in FIG.
[0009]
That is, the router 11 transmits the port aa. aa. aa. aa: bbb is transmitted to the port tt. tt. tt. From tt: sss, it transmits to the specified port (in the case of FIG. 2, the port xx.xx.xx.xx: yyy of the server 3) and the specified global IP address xx. xx. xx. xx. port of server 3 having server xx.xx. xx. xx. xx: yyy or port xx. xx. xx. xx: zzz to port tt. tt. tt. tt: All packets transmitted to sss are sent to port aa. aa. aa. aa: Transfer to bbb. However, the router 11 has a designated global IP address xx. xx. xx. xx (with a global IP address pp.pp.pp.pp) of server 4 pp. pp. pp: qqq to port tt. tt. tt. tt: Reject reception of all packets transmitted to sss.
[0010]
FIG. 3 shows a configuration example of a network to which a router having a function of Port Restricted Cone NAT is connected.
[0011]
Port Restricted Cone NAT has almost the same function as Restricted Cone NAT, but also restricts the port number.
[0012]
That is, the router 12 having the function of Port Restricted Cone NAT transmits the port aa. aa. aa. aa: bbb is transmitted to the port tt. tt. tt. tt: sss to the designated port (in the case of FIG. 3, the port xx.xx.xx.xx: yyy of the server 3), and the designated global IP address and the port xx. xx. xx. xx: port xx. of server 3 with yyy. xx. xx. xx: yyy to port tt. tt. tt. tt: All packets transmitted to sss are sent to port aa. aa. aa. aa: Transfer to bbb. However, the router 12 does not have the designated global IP address and port xx. xx. xx. xx: port pp. of server 4 not having yyy (having global IP address pp.pp.pp.pp) pp. pp. pp: qqq to port tt. tt. tt. tt: sss as well as the global IP address and xx. xx. xx. xx are the same, but ports zz. xx. xx. xx: zzz to port tt. tt. tt. tt: Refuse to receive the packet transmitted to sss.
[0013]
In recent years, as a technique for performing UDP (User Datagram Protocol) communication connected to a router having a NAT function, STUN (Simple Travel of UDP through NAT) is known (for example, see Non-Patent Documents 1 to 3). .
[0014]
FIG. 4 is a diagram illustrating a configuration example of a network connected using STUN.
[0015]
The client 30 includes a STUN client unit 31. The STUN client unit 31 includes a global address inquiry unit 41 and a global address reception unit 42.
[0016]
The router 13 connected to the client 30 is provided with an address translator 51.
[0017]
A STUN server unit 71 connected to the router 13 via the Internet 60 is provided with a STUN server unit 71, and the STUN server unit 71 has a global address inquiry response unit 81.
[0018]
The purpose of the STUN protocol is that the client 30 located under the router 13 as shown in FIG. 5 is configured such that the global IP and port outside the router 13 (in the example of FIG. 5, tt.tt.tt.tt:sss). It is to know. However, generally, the client 30 cannot directly obtain such information from the router 13.
[0019]
Therefore, the client 30 acquires the global IP and the port (on the Internet 60 side) outside the router 13 (tt.tt.tt.tt.tt:sss in the example of FIG. 5) according to the following procedure.
[0020]
First, a STUN server 70 having a known global IP and port (xx.xx.xx.xx: yyy in the case of FIG. 5) is prepared on the Internet 60.
[0021]
Next, the client 30 transmits a UDP packet A to the STUN server 70 via the router 13 and the Internet 60. At this time, the start point (source address) is aa. aa. aa. aa: bbb (local IP address), and the end point (destination address) is xx. xx. xx. xx: yyy (global IP address).
[0022]
The address conversion unit 51 of the router 13 sets the start point of the packet A to tt. tt. tt. tt: ss (global IP address), and converts the xx. xx. xx. xx: yyy, which is transmitted to the STUN server 70. At this time, the address translation unit 51 of the router 13 sends the tt. tt. tt. tt: sss (global IP address) transmitted packet to aa. aa. aa. aa: Generates an address conversion map to be transferred to bbb (local IP address).
[0023]
When receiving the packet A via the Internet 60, the global address inquiry response unit 81 of the STUN server 70 generates a packet B responding to the packet A. The global address inquiry response unit 81 sends the packet B a global IP address tt. tt. tt. tt: sss is included. The STUN server 70 returns the generated packet B to the router 13 via the Internet 60. The source address of the packet B is xx. xx. xx. xx: yyy, and the destination address is tt. tt. tt. tt: sss.
[0024]
The address translation unit 51 of the router 13 refers to the address translation map and determines the end point (destination) of the received packet B as aa. aa. aa. aa: bbb is converted and transmitted to the client 30.
[0025]
The client 30 transmits the global address tt. tt. tt. Get tt and port sss. Accordingly, the client 30 determines that the global IP: port of the router 13 is tt. tt. tt. tt: sss can be obtained.
[0026]
Therefore, it is conceivable that the STUN server 70 is used to generate an address conversion map in the router 13 (after executing the above-described processing), and then perform UDP streaming communication using the map. This will be described with reference to FIG.
[0027]
As shown in FIG. 6, the client 30 is connected to the Internet 60 via the router 13, and the STUN server 70 and the client 90 are also connected to the Internet 60.
[0028]
The client 30 has a port 10000, the router 13 has a port 27000, and the client 90 has a port 10000. That is, in the case of the example of FIG. 6, the client 30 and the client 90 have the port 10000 of the same number. The client 30 located below the router 13 has a local IP address, and the client 90 directly connected to the Internet 60 without going through a router has a global IP address.
[0029]
Next, processing in the network configuration of FIG. 6 will be described with reference to the arrow chart of FIG. This processing is started when a streaming communication with the client 90 is instructed by the user of the client 30.
[0030]
In step S1, the client 30 inquires of the STUN server 70 about the global IP address: port of the router 13. At this time, when the client 30 transmits a predetermined packet to the STUN server 70, the router 13 converts the start point of the packet to the global IP address: port of the router 13 as described above, and from the global side to the local side. Generate the map to be transferred.
[0031]
When the inquiry (step S1) is output from the client 30, the STUN server 70 receives this inquiry in step S31. The STUN server 70 generates a packet for this inquiry. As described above, this packet includes the global IP address: port of the transmission source (router 13) described in the received packet.
[0032]
In step S32, the STUN server 70 transmits the generated packet (the packet including the port: the global IP address of the router 13). This packet is transmitted to the router 13, and the router 13 refers to the generated map, converts the end point (transmission destination) of the received packet into the local IP address: port of the client 30, and transfers it to the client 30.
[0033]
In step S2, the client 30 receives the packet transmitted as a result of the processing in step S32 (the packet including the global IP address: port of the router 13 as described above). Thus, the client 30 can obtain the global IP address: port of the router 13.
[0034]
In step S3 and step S51, the client 30 and the client 90 exchange each other's global IP address: port (notify the other party of the global IP address: port used by themselves). For example, the client 30 generates a packet including the obtained global IP address: port information of the router 13 and transmits the packet to the client 90 via the router 13 and the Internet 60. By transmitting the current global IP address: port to the client 30, the mutual global IP address: port can be acquired.
[0035]
Thereby, the client 30 and the client 90 can transmit information to each other's global IP address: port.
[0036]
In step S4, the client 30 transmits the video / audio stream to the global IP address: port of the client 90 via the router 13 and the Internet 60. At this time, the port of the client 90 is 10,000. Specifically, when the client 30 transmits the video / audio stream to the global IP address: port of the client 90, the router 13 sets the local IP address: port of the client 30 (transmission source) as the packet transmission source. , The global IP address: port of the router 13 and transmit it to the client 90.
[0037]
In step S52, the client 90 receives and reproduces the image / sound stream transmitted by the client 30 in the process of step S4.
[0038]
In step S53, the client 90 transmits the video / audio stream to the global IP address: port of the router 13 via the Internet 60. The router 13 refers to the map, converts the global IP address: port of the packet destination (the global IP address: port of the router 13) into the local IP address: port of the client 30, and converts the image / audio stream into Transfer to client 30.
[0039]
In step S5, the client 30 receives and reproduces the image / sound stream transmitted by the client 90 in the process of step S53.
[0040]
As a result, even the client 30 connected to the router 13 and having the local IP address: port can transmit / receive an image / audio stream to / from another client 90.
[0041]
[Non-patent document 1]
MIDCOM WG, J.M. Rosenberg, dynamics, J. et al. Weinberger, dynamics, C.I. Huitema, Microsoft, R.A. Mahy, Cisco, "STUN-Simple Traversal of UDP Through Network Address Translators", [online], March 1, 2002, IETF (The Internet, August 14, 2002). URL: http: // www. ief. org / internet-drafts / draft-rosenberg-midcom-stun-01. txt>, document name (draft-rosenberg-midcom-stun-01.txt)
[Non-patent document 2]
MIDCOM WG, J.M. Rosenberg, dynamics, J. et al. Weinberger, dynamics, C.I. Huitema, Microsoft, R.A. Mahy, Cisco, "STUN-Simple Traversal of UDP Through Network Address Translators", [online], March 1, 2002, IETF (The Internet, August 14, 2002). URL: http: // www. potaroo. net / ietf / ids / draft-rosenberg-midcom-stun-01. txt>, document name (draft-rosenberg-midcom-stun-01.txt)
[Non-Patent Document 3]
MIDCOM WG, J.M. Rosenberg, dynamics, J. et al. Weinberger, dynamics, C.I. Huitema, Microsoft, R.A. Mahy, Cisco, "STUN-Simple Traversal of UDP Through Network Address Translators", [online], March 1, 2002, IETF (The Internet, August 14, 2002). URL: http: // www. watersprings. org / pub / id / draft-rosenberg-midcom-stun-01. txt>, document name (draft-rosenberg-midcom-stun-01.txt)
[0042]
[Problems to be solved by the invention]
However, in the system of FIG. 6, in addition to the two parties (the client 30 and the client 90 in the example of FIG. 6) that perform streaming communication of images and sounds, a router to which a device having no global address is connected is connected. There is a problem that the STUN server 70 is required to obtain a global address.
[0043]
Also, the router 13 needs to have a Full Cone NAT function as shown in FIG. 1 and uses a Restricted Cone NAT or a Port Restricted Cone NAT function that restricts access from outside the router. There was a problem that it was not possible.
[0044]
The present invention has been made in view of such a situation, and it is an object of the present invention to easily perform streaming communication via the Internet using a router having a NAT function.
[0045]
[Means for Solving the Problems]
A first network system according to the present invention includes a first information processing apparatus, a communication control apparatus connected to the first information processing apparatus on a first side, and a second side of the communication control apparatus via a network. A network system comprising a second information processing device connected to and connected to the first information processing device, for transmitting and receiving information to and from the first information processing device. Request means for requesting notification of first unique information which is unique information on the first side of the control device, first identification information for identifying a service in the communication control device, and a request from the request means Is received by the communication control device, the second unique information, which is unique information on the second side of the first information processing device, and the second identification for identifying the service in the first information processing device. Information to the first unique information And a first transfer unit for converting the request into the first identification information and transferring the request to the second information processing device; and transmitting the request from the first information processing device transferred from the first transfer unit to the second information processing device. A response output unit that outputs a request including the requested first unique information and a notification of the first identification information to the first information processing device, Is received by the communication control device, the first unique information and the first identification information are converted into the second unique information and the second identification information, and the response is transferred to the first information processing device. A second transfer unit, a response receiving unit that receives a response from the second information processing device transferred from the second transfer unit, and a case where the second information processing device starts transmitting information. Responding to the third identification information for identifying the service transmitting the information; The information is set to be the same as the fourth identification information for identifying the service to be output, and the information transmitting means for transmitting the information, and when the communication control device receives the information from the information transmitting means, the first unique information and the fourth A third transfer unit that converts the first identification information into the second unique information and the second identification information and transfers the information to the first information processing apparatus; and a third transfer unit that transfers the information from the third transfer unit. Information receiving means for receiving information from the second information processing apparatus.
[0046]
The requesting means transmits a request from a first port provided with second identification information, the first transfer means transfers the request from a second port provided with first identification information, and the response output means , A response is output from a third port comprising the fourth identification information, the second transfer means transfers the response from the second port, the response receiving means receives the response at the first port, The information transmitting means transmits information from a third port provided with the third identification information, the third transferring means transfers information from the second port, and the information receiving means transmits information at the first port. Can be received.
[0047]
The first unique information is a global IP address, the second unique information is a local IP address, the first identification information is a port number of a port on which the communication control device performs communication service, The second identification information is a port number of a port on which the first information processing apparatus provides a communication service, and the third identification information is a port number of a port on which the second information processing apparatus provides a service for transmitting information. And the fourth identification information may be a port number of a port that performs a service for outputting a response from the second information processing apparatus.
[0048]
According to a first communication method of the present invention, a first information processing apparatus, a communication control apparatus connected to the first information processing apparatus on a first side, and a second side of the communication control apparatus via a network. A communication method of a network system including a second information processing device connected to and connected to the first information processing device, for transmitting and receiving information to and from the first information processing device. Requesting notification of first unique information that is unique information on the first side of the communication control device, and first identification information for identifying a service in the communication control device; When the communication control device receives the request from the first information processing device, the second side of the first information processing device identifies the second unique information, which is unique information, and the service in the first information processing device. The second identification information is A first transfer step of converting the request into unique information and first identification information, and transferring the request to the second information processing apparatus; and a first information processing apparatus transferred by the processing of the first transfer step. Outputting the requested first unique information and a response including a notification of the first identification information to the first information processing device when the second information processing device receives the request by the second information processing device. When the communication control device receives a response by the process of the response output step, the first unique information and the first identification information are converted into the second unique information and the second identification information, and the response is converted to the first unique information. A second transfer step of transferring the information to the second information processing apparatus, a response receiving step of receiving a response from the second information processing apparatus transferred by the processing of the second transfer step, and a second step of transmitting the information. When the information processing device starts An information transmitting step of transmitting information by setting third identification information for identifying a service for transmitting information to be the same as fourth identification information for identifying a service for outputting a response; When the communication control device receives the information transmitted by the processing of the above, the first unique information and the first identification information are converted into the second unique information and the second identification information, and the information is converted into the first information. It is characterized by including a third transfer step of transferring to the information processing apparatus, and an information receiving step of receiving information from the second information processing apparatus transferred by the processing of the third transfer step.
[0049]
A first information processing apparatus according to the present invention includes a first unique information transmitted from another information processing apparatus, the first unique information being information unique to the communication control apparatus, and a first information for identifying a service in the communication control apparatus. Receiving means for receiving a request for notification of the first identification information, and a first unique information of the communication control device corresponding to the request for notification of the first unique information and the first identification information received by the request receiving means. A response output unit that outputs a response including the notification of the information and the first identification information; and an information transmission unit that transmits the information to another information processing device. The information transmission unit outputs information of the information processing device. The second identification information for identifying the service is the same as the third identification information for identifying the service to which the response output unit of the information processing device outputs a response.
[0050]
The request for notification of the first unique information and the first identification information received by the request receiving means includes the first unique information and the first identification information of the communication control device as information representing a transmission source. The information indicating the transmission destination includes second unique information that is information unique to the information processing apparatus and third identification information for identifying a service in the information processing apparatus, and is output by the response output unit. The response including the notification of the first unique information and the first identification information of the communication control device includes the second unique information and the third identification information as information indicating the transmission source, and Contains the first unique information and the first identification information of the communication control device, and the information transmitted by the information transmitting means includes the second unique information and the second Information that contains the It may be to include the first unique information and the first identification information of the communication control apparatus.
[0051]
The first unique information is a global IP address, the second unique information is a global IP address, the first identification information is a port number of a port on which the communication control device performs communication service, The second identification information is a port number of a port that provides a service for transmitting information from the information processing apparatus, and the third identification information is a port number of a port that provides a service for outputting a response from the information processing apparatus. You can do so.
[0052]
According to the information processing method of the present invention, first information unique to a communication control device and transmitted from another information processing device, and first identification information for identifying a service in the communication control device are provided. Receiving the request for notification of the first unique information and the first unique information of the communication control device in response to the request for notification of the first unique information and the first identification information received by the processing of the request receiving step. And a response output step of outputting a response including a notification of the first identification information, and an information transmission step of transmitting information to another information processing apparatus, wherein the processing of the information transmission step includes outputting information of the information processing apparatus. The second identification information for identifying the service to be provided is the same as the third identification information for identifying the service that outputs a response by the processing of the response output step of the information processing device.
[0053]
The program of the present invention is a program for transmitting first unique information, which is information unique to a communication control device, transmitted from another information processing device, and first identification information for identifying a service in the communication control device. Receiving the first request, and responding to the request for notifying the first unique information and the first identification information received by the processing of the request receiving step, 1) a response output step of outputting a response including a notification of the identification information; and an information transmission step of transmitting information to another information processing apparatus. The processing of the information transmission step is a service for outputting information of the information processing apparatus. Is characterized in that the second identification information for identifying the service is the same as the third identification information for identifying a service that outputs a response by the processing of the response output step of the information processing apparatus.
[0054]
A second network system according to the present invention includes a first information processing device, a communication control device connected to the first information processing device on a first side, and a second side of the communication control device via a network. A network system comprising a second information processing device connected to and connected to the first information processing device, for transmitting and receiving information to and from the first information processing device. Request means for requesting notification of first unique information which is unique information on the first side of the control device, first identification information for identifying a service in the communication control device, and a request from the request means Is received by the communication control device, the second unique information, which is unique information on the second side of the first information processing device, and the second identification for identifying the service in the first information processing device. Information to the first unique information And a first transfer unit for converting the request into the first identification information and transferring the request to the second information processing device; and transmitting the request from the first information processing device transferred from the first transfer unit to the second information processing device. A response output unit that outputs a request including the requested first unique information and a notification of the first identification information to the first information processing device, Is received by the communication control device, the first unique information and the first identification information are converted into the second unique information and the second identification information, and the response is transferred to the first information processing device. A second transfer unit, a response receiving unit that receives a response from the second information processing device transferred from the second transfer unit, and a case where the second information processing device starts transmitting information. Information transmitting means for transmitting information, and communication control of information from the information transmitting means; A third transfer for converting the first unique information and the first identification information into the second unique information and the second identification information when the apparatus receives the information, and transferring the information to the first information processing apparatus; Means, and information receiving means for receiving information from the second information processing device transferred from the third transfer means.
[0055]
The first unique information is a global IP address, the second unique information is a local IP address, the first identification information is a port number of a port on which the communication control device performs communication service, The second identification information may be a port number of a port on which the first information processing device provides communication service.
[0056]
According to a second communication method of the present invention, a first information processing device, a communication control device connected to the first information processing device on a first side, and a second side of the communication control device via a network. A communication method of a network system including a second information processing device connected to and connected to the first information processing device, for transmitting and receiving information to and from the first information processing device. Requesting notification of first unique information that is unique information on the first side of the communication control device, and first identification information for identifying a service in the communication control device; When the communication control device receives the request from the first information processing device, the second side of the first information processing device identifies the second unique information, which is unique information, and the service in the first information processing device. The second identification information is A first transfer step of converting the request into unique information and first identification information, and transferring the request to the second information processing apparatus; and a first information processing apparatus transferred by the processing of the first transfer step. Outputting the requested first unique information and a response including a notification of the first identification information to the first information processing device when the second information processing device receives the request by the second information processing device. When the communication control device receives a response by the process of the response output step, the first unique information and the first identification information are converted into the second unique information and the second identification information, and the response is converted to the first unique information. A second transfer step of transferring the information to the second information processing apparatus, a response receiving step of receiving the response from the second information processing apparatus transferred by the processing of the second transfer step, and a transmission of the information to the second information processing apparatus. When the information processing device starts When the communication control device receives the information transmitted in the information transmitting step of transmitting information and the information transmitted in the information transmitting step, the first unique information and the first identification information are replaced with the second unique information and the second unique information. A third transfer step of converting the information into identification information and transferring the information to the first information processing apparatus, and information receiving the information from the second information processing apparatus transferred by the processing of the third transfer step Receiving step.
[0057]
The second information processing apparatus of the present invention requests another information processing apparatus to notify of unique information that is information unique to the communication control apparatus and identification information for identifying a service in the communication control apparatus. Requesting means, a response receiving means for receiving a response corresponding to the request from the requesting means, the response including a notification of the unique information and the identification information, transmitted from the other information processing apparatus, and the other information processing apparatus. And an information transmitting means for transmitting information to another information processing apparatus.
[0058]
The unique information may be a global IP address, and the identification information may be a port number of a port on which the communication control device provides communication service.
[0059]
The third information processing apparatus of the present invention is configured to transmit a unique information, which is information unique to the communication control apparatus, transmitted from another information processing apparatus, and a notification of identification information for identifying a service in the communication control apparatus. Request receiving means for receiving a request, and response output means for outputting a response including notification of the unique information and identification information of the communication control device in response to the request for notification of the unique information and identification information received by the request receiving means And information transmitting means for transmitting information to another information processing apparatus.
[0060]
The unique information may be a global IP address, and the identification information may be a port number of a port on which the communication control device provides communication service.
[0061]
According to the first aspect of the present invention, the first information processing apparatus identifies, from the second information processing apparatus, first unique information which is information unique to the communication control apparatus and a service in the communication control apparatus. Requesting notification of the first identification information for the communication control device, the second information processing device transmits a response including the first unique information and the first identification information of the communication control device to the first information processing device I do. Further, when transmitting information to the first information processing apparatus, the second information processing apparatus uses third identification information for identifying a service for transmitting the information and information for identifying a service for outputting a response. The same as the fourth identification information.
[0062]
In the second aspect of the present invention, a request for notification of first unique information, which is information unique to the communication control device, and first identification information for identifying a service in the communication control device is issued from another information processing device. When received, a response including a notification of the first unique information and the first identification information of the communication control device is output in response to the request. When transmitting information to another information processing apparatus, the second identification information for identifying the service that outputs information is the same as the third identification information for identifying the service that outputs a response.
[0063]
In the third invention of the present application, the first information processing apparatus identifies the first unique information, which is information unique to the communication control device, and the service in the communication control device from the second information processing device. Requesting notification of the first identification information for the communication control device, the second information processing device transmits a response including the first unique information and the first identification information of the communication control device to the first information processing device I do.
[0064]
According to the fourth aspect of the present invention, notification of first identification information, which is information unique to the communication control device, and first identification information for identifying a service in the communication control device, to another information processing device. Is received, and a response corresponding to the request transmitted from another information processing apparatus is received.
[0065]
According to the fifth aspect of the present invention, a request for notification of first unique information, which is information unique to the communication control device, and first identification information for identifying a service in the communication control device is issued from another information processing device. Is received, in response to this request, a response including the first unique information and the first identification information of the communication control device is output and transmitted to another information processing device.
[0066]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 8 shows a configuration example of a network system to which the present invention is applied.
[0067]
The client 120 is connected to the Internet 60 via a router 180 having a NAT function. Further, the client 200 is directly connected to the Internet 60 without passing through a router (a router having a NAT function). The clients 120 and 200 and the router 180 are configured by, for example, a personal computer (for example, a personal computer 300 in FIG. 11 described later).
[0068]
The client 120 is connected to the lower side of the router 180 (the local network side on the left side in FIG. 8) together with other clients (not shown), and the local IP address: port (the local IP address is lower than the router 180 (FIG. 8)). In the network (within the local network) on the left side, unique information that is unique to the client 120, and the port number is identification information for identifying a service in the client 120). More precisely, the local IP address is assigned to each client by the router 180, but the port is set by each client. The client 120 includes a STUN client unit 121, an RTP receiving unit 122, a STUN server unit 123, and an RTP transmitting unit 124. The STUN client unit 121 is provided with a global address inquiry unit 141 and a global address reception unit 142, which inquire a global address and receive a global address, respectively. The STUN server unit 123 is provided with a global address inquiry response unit 161 that responds to a global address inquiry.
[0069]
The router 180 is provided with an address translation unit 181. The address translation unit 181 translates a global address into a local address, translates a local address into a global address, and performs a routing process based on the translation map. Execute.
[0070]
The client 200 is directly connected to the Internet 60 without using a router, and has a global IP address: port (the global IP address is unique information that is unique to the client 200 in the Internet 60 as a global network; The port number is identification information for identifying a service in the client 200). In this case, more precisely, the global IP address is assigned, but the port is set by itself.
[0071]
The client 200 includes a STUN client unit 201, an RTP receiving unit 202, a STUN server unit 203, and an RTP transmitting unit 204. The STUN client unit 201 includes a global address inquiry unit 221 and a global address reception unit 222. The STUN server unit 123 includes a global address inquiry response unit 241. As described above, the configuration of the client 200 is the same as the configuration of the client 120, and a description thereof will be omitted.
[0072]
Now, it is assumed that each of the client 120, the router 180, and the client 200 has an IP address: port as shown in FIG.
[0073]
That is, the local address of the client 120 is 192.168.0.2, and has the port 10000 and the port 20000. STUN server section 123 transmits and receives information using port 20000. Further, the client 120 receives information from the port 10000 and transmits information from the port 20000.
[0074]
The local address of the router 180 is 192.168.0.1, and the global address is 12.34.56.78. The router 180 has a port 27000 and a port 37000 on the global side (the side of the Internet 60).
[0075]
The global address of the client 200 is set to 11.2.2.33.44, and has a port 10000 and a port 20000. The STUN server unit 203 transmits and receives information using the port 20000. The client 200 further receives information on the port 10000 and transmits information from the port 20000.
[0076]
That is, the ports of the client 120 and the client 200 are the ports of the same number (in the example of FIG. 9, the ports 10000 and 20000).
[0077]
The communication process between the client 120 and the client 200 in FIG. 9 will be described with reference to the arrow chart in FIG. Note that this process is started when communication with the client 200 is instructed by the user of the client 120 (for example, an image / audio stream is transmitted or received from the client 200 and reproduced. Starts when commanded to
[0078]
In step S101, the global address inquiry unit 141 of the client 120 inquires the STUN server unit 203 of the client 200 about the global IP address: port (the global IP address of the router 180: inquires about the port) (requests notification). Do). At this time, in the request packet transmitted by the client 120, the address of the transmission source (From) is 192.168.0.2:10000 (IP address: port number), and the address of the transmission destination (To) is , 11.22.33.44:20000 (IP address: port number).
[0079]
The packet (inquiry packet (notification request packet)) output from the global address inquiry unit 141 of the client 120 by the processing in step S101 is received by the router 180 in step S131. The address conversion unit 181 of the router 180 determines the source 192.168.0.2:10000 (IP address: port number) of the packet (From) and the address 11.22.33. The source (From) address 192.168.0.2:10000 (IP address: port number) of 44: 20000 (IP address: port number) is converted to the global IP address: port of the router 180 itself. Then, a map that associates the two addresses is generated. After that, the address conversion unit 181 transmits the packet to the destination via the Internet 60.
[0080]
Specifically, the address conversion unit 181 of the router 180 converts the address (192.168.0.2:10000 (local IP address: port number)) of the transmission source (From) into 12.34.56.78:27000 ( (Global IP address: port number). At this time, as described above, the address conversion unit 181 generates a map. The map includes information that the local IP address: port 192.168.0.2:10000 corresponds to the global IP address: port 12.34.56.78:27000. Thereafter, the router 180 transmits this packet to the client 200 (destination (To) 11.22.33.44:20000 (IP address: port number)) as the transmission destination via the Internet 60. At this time, the address of the source (From) of the packet to be transmitted is 12.34.56.78:27000 (IP address: port number), and the address of the destination (To) is 11.22.33.44. : 20000 (IP address: port number).
[0081]
The packet (inquiry packet) transmitted by the processing in step S131 is received by the global address inquiry response unit 241 of the client 200 in step S161. Specifically, the destination (To) of the packet is 11.22.33.44:20000 (IP address: port number), so the global address inquiry response unit 241 of the STUN server unit 203 sends this Receive.
[0082]
In step S162, if the global address inquiry response unit 241 of the client 200 determines that the received packet is a packet requesting a notification of the global IP address and the port based on the content, the global address inquiry response unit 241 responds to the inquiry received in step S161. Generate a response packet. The global address inquiry response unit 241 writes the global IP address of the router 180: port 12.34.56.78:27000 (IP address: IP address) described in the response packet as the address of the source (From) of the inquiry packet. Port number) is described as data (contents of the packet), and the global IP address of the STUN server unit 203: port number 11.22.33.44:20000 (IP address: port) as the address of the transmission source (From) Number), and the address 12.34.56.78:20000 (IP address: port number) described as the source of the inquiry packet is described as the address of the destination (To).
[0083]
The response packet transmitted by the process of step S162 is received by the router 180 in step S132 (since the address of the destination (To) of the response packet is the address of the router 180). The address conversion unit 181 of the router 180 stores the map (local IP address: port 192.168.0.2:10000, global IP address: port 12.34.56.78:27000) generated by the processing of step S131. With reference to a map describing a correspondence relationship of correspondence, the address (12.34.56.78:20000) of the destination (To) of the response packet is set to the local IP address (192.168. 0.2: 10000). The router 180 then transfers the response packet to the client 120.
[0084]
In the response packet transferred in the process of step S132, the address of the transmission destination (To) is 192.168.0.2:10000 (IP address: port number), and the address of the transmission source (From) is 11 .22.33.44: 20000 (IP address: port number), and is received by the port 10000 of the client 120 in step S102. In this response packet, 12.34.56.78:27000 (IP address: port number) which is the global IP address: port of the router 180 is described as data. Therefore, the global address receiving unit 142 of the client 120 reads the data part of the response packet, and thereby obtains the global IP address: port of 12.34.56.78:27000 (IP address: port number) of the router 180. ) Can be obtained.
[0085]
It is assumed that, for example, in step S163, the global address inquiry response unit 221 of the client 200 inquires the client 120 (the STUN server unit 123 of the client 120) about the global IP address: port. In the inquiry packet, the address of the transmission source (From) 11.22.33.44:10000 and the address of the transmission destination (To) 12.34.56.78:20000 are described.
[0086]
The port 20000 of the destination address is predetermined as a common port number of the STUN server unit 203 in this network system. However, even if the STUN server unit 123 of the client 120 uses the port with the number 20000, the client 120 is connected below the router, and the router interprets this port number as the port number of the router. Since the router does not have a map for the port with the number 20000, the router eventually refuses to receive the inquiry packet from the client 200.
[0087]
Most of all, since the client 200 is not connected to the router and does not need to query the global IP address of the router, the client 200 does not actually perform such processing.
[0088]
In step S103, the client 120 obtains the global IP address: port (12.34.56.78:27000) of the router 180 obtained by the processing of step S102 (the router 180 has the port 27000 and the port 37000). , Using the port 27000 as a port for receiving). Similarly, in step S164, the client 200 has its own global IP address: port (11.22.33.44:10000) (the client 200 has a port 10000 and a port 20000, but receives it. Port 10000) is transmitted to the client 120. That is, by the processing of steps S103 and S164, the clients 120 and 200 receive the global IP address: port for reception transmitted from the other party.
[0089]
The exchange of the global IP address: port can be performed by a subsequent method. When the client 120 transmits an image / audio stream to the client 200, in step S104, the RTP transmission unit 124 of the client 120 obtains the destination (To) of the packet by the client 200 , A global IP address: port (in the example of FIG. 10, 11.22.33.44:10000), an image / audio stream is arranged in the data portion of the packet, and the packet is transmitted. At this time, the address of the transmission source (From) of the packet is 192.168.0.2:20,000.
[0090]
On the other hand, in step S134, the address conversion unit 181 of the router 180 determines the address 192.168.0.2 as the source (From) of the packet of the image / audio stream transmitted from the client 120: 20000 is converted to the address of the router 180 (address of the port 37000 used for transmission) 12.34.56.78:37000, and the client 200 (11.22.33.44 specified in the destination address) is converted. : 10000). The RTP receiving unit 202 of the client 200 receives this packet from the port 10000 and executes a predetermined process (for example, the image / audio stream stored in the data part of the received packet is displayed on the display unit or the speaker). (Both are not shown)).
[0091]
When the client 200 transmits an image / audio stream to the client 120, in step S166, the RTP transmission unit 204 of the client 200 transmits the global IP address: port (actually, the port) of the client 120 acquired in the processing of step S164. Is the global IP address: port of the router 180 (12.34.56.78:27000 in the example of FIG. 10) as the destination (To) address of the packet, and the image / audio stream is the data portion of the packet. And send it. At this time, the address of the transmission source (From) of the packet is 11.22.33.44:20000.
[0092]
On the other hand, in step S135, the address conversion unit 181 of the router 180 determines the address 12.34.56.78 as the destination (To) of the packet of the video / audio stream transmitted from the client 200: 27000 is converted to the address of the client 120 (the port 10000 used for reception (of course, this address is a local IP address: port)), and the client 120 (192.168. 0.2: 10000) The RTP receiving unit 122 of the client 120 receives the packet from the port 10000 and executes a predetermined process (for example, a received image / audio stream is displayed on a display unit or the like). Output to the speaker).
[0093]
As described above, the partner of the streaming communication (the client 200 in the example of FIG. 9) plays the role of the STUN server (for example, the STUN server 70 shown in FIG. 6) (the STUN server unit 203 is assigned to the client 200). With such a configuration, it is not necessary to provide a STUN server on the network system, so that communication not limited to the STUN server can be performed.
[0094]
Further, a STUN server unit (STUN server unit 203 in the example of FIG. 9) used to generate a map by the router 180 and a device for transmitting an image / audio stream (a client 200 in the example of FIG. 9). ) Have the same global IP address (11.22.33.44 in the case of the example of FIG. 9), so that a router having a function of a restricted cone NAT as well as a full cone NAT is used as the router 180. can do.
[0095]
Further, the port number of the STUN server unit 203 (in the case of FIG. 9, the port number of the STUN server unit 203 20,000) and the port number for transmitting the stream (in the case of FIG. 9, the port number 20000 of the client 200, ie, , And the port number of the port used by the RTP transmission unit 204), the Port Restricted Cone NAT can be used as the router 180.
[0096]
However, at least one of the streaming communications (the client 200 in the example of FIG. 9) needs to be directly connected to the Internet 60 without using a NAT.
[0097]
Note that an internet service provider may be provided between the router 180 and the internet 60. In this case, the global address of the router 180 is assigned by the Internet service provider. Similarly, an Internet service provider may be provided between the client 200 and the Internet 60. Also in this case, the global address of the client 200 is the global address assigned by the Internet service provider.
[0098]
In the above description, the network is the Internet. However, the present invention can be applied to a case where a network other than the Internet is used. In addition, the client may be a PDA (Personal Digital Assistants), a mobile phone, or another information processing device other than the personal computer. Also, the router can be a communication control device that controls communication other than the router.
[0099]
Furthermore, in the above description, the global IP address, the local IP address, and the router are used. However, the global IP address may be other information as long as the information is unique to the device. Other information may be used as long as the information is unique within a limited range of the device. Also, the port number may be any other information as long as it is identification information for identifying a service in the device. Further, the service is, for example, predetermined stream information.
[0100]
The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer built in dedicated hardware or installing various programs. For example, it is installed in a general-purpose personal computer or the like from a network or a program storage medium. In this case, for example, the client 120, the router 180, or the client 200 in FIG. 9 is configured by a personal computer 300 as shown in FIG.
[0101]
In FIG. 11, a CPU (Central Processing Unit) 301 performs various processes according to a program stored in a ROM (Read Only Memory) 302 or a program loaded from a storage unit 308 into a RAM (Random Access Memory) 303. Execute. The RAM 303 also appropriately stores data necessary for the CPU 301 to execute various processes.
[0102]
The CPU 301, the ROM 302, and the RAM 303 are interconnected via an internal bus 304. An input / output interface 305 is also connected to the internal bus 304.
[0103]
The input / output interface 305 includes an input unit 306 including a keyboard, a mouse, and the like, a display including a CRT (cathode ray tube), an LCD (Liquid Crystal Display), an output unit 307 including a speaker, a hard disk, and the like. A communication unit 309 including a storage unit 308, a modem, a terminal adapter, and the like is connected. The communication unit 309 performs communication processing via various networks including a satellite line and a CATV.
[0104]
A drive 310 is connected to the input / output interface 305 as necessary, and a magnetic disk 321, an optical disk 322, a magneto-optical disk 323, a semiconductor memory 324, or the like is appropriately mounted, and a computer program read therefrom is required. Is installed in the storage unit 308 in accordance with.
[0105]
When a series of processing is executed by software, a program constituting the software is used to execute various functions by installing a computer incorporated in dedicated hardware or installing various programs. For example, it is installed in a general-purpose personal computer that can be executed from a network or a program storage medium.
[0106]
As shown in FIG. 11, the program storage medium is distributed separately from a computer to provide the program to a user. The program is recorded on a magnetic disk 321 (including a floppy disk) and an optical disk 322 (including a floppy disk). It is only constituted by a package medium including a CD-ROM (Compact Disc-Read Only Memory), a DVD (including a Digital Versatile Disc), a magneto-optical disk 323 (including an MD (Mini Disc)), a semiconductor memory 324, and the like. Instead, it is configured by a hard disk including a ROM 302 and a storage unit 308 in which a program is recorded and provided to a user in a state where the program is incorporated in the apparatus main body in advance.
[0107]
In this specification, a step of describing a computer program refers to not only a process performed in chronological order according to the described order, but also a process executed in parallel or individually even if not necessarily performed in chronological order. Is also included.
[0108]
【The invention's effect】
As described above, according to the first aspect of the present invention, information can be exchanged via a network using a communication control device having an address conversion function. In particular, according to the present invention, a dedicated device for notifying an address can be omitted from the network. Therefore, the configuration of the entire system can be simplified and the cost can be reduced. Further, according to the present invention, it is possible to perform communication regardless of the type of the communication control device without complicating the configuration of the network system and without increasing the cost.
[0109]
According to the second aspect of the present invention, information can be exchanged via a network using a communication control device having an address conversion function. In particular, according to the present invention, it is possible to perform communication independent of the type of communication control device without complicating the configuration of the network system and without increasing the cost.
[0110]
According to the third aspect of the present invention, information can be exchanged via a network using a communication control device having an address conversion function. In particular, according to the present invention, a dedicated device for notifying an address can be omitted from the network. Therefore, the configuration of the entire system can be simplified and the cost can be reduced.
[0111]
According to the fourth aspect of the present invention, information can be exchanged via a network using a communication control device having an address conversion function. In particular, according to the present invention, a dedicated device for notifying an address can be omitted from the network.
[0112]
According to the fifth aspect of the present invention, information can be exchanged via a network using a communication control device having an address conversion function.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a network connected via a router having a conventional Full Cone NAT function.
FIG. 2 is a diagram illustrating a configuration example of a network connected via a router having a function of a conventional restricted cone NAT.
FIG. 3 is a diagram illustrating a configuration example of a network connected via a router having a function of a conventional Port Restricted Cone NAT.
FIG. 4 is a block diagram showing a configuration example of a network connected by using a conventional STUN.
FIG. 5 is a diagram illustrating the network of FIG. 4;
6 is a diagram illustrating streaming communication in the network of FIG.
FIG. 7 is an arrow chart for explaining processing in the network of FIG. 6;
FIG. 8 is a block diagram illustrating a configuration example of a network system to which the present invention has been applied.
FIG. 9 is a diagram illustrating addresses of the network system of FIG. 8;
FIG. 10 is an arrow chart illustrating processing in the network system of FIG. 8;
FIG. 11 is a block diagram illustrating a personal computer.
[Explanation of symbols]
120 client, 121 STUN client unit, 122 RTP reception unit, 123 STUN server unit, 124 RTP transmission unit, 141 global address inquiry unit, 142 global address reception unit, 161 global address inquiry response unit, 180 router, 181 address conversion unit, 200 client, 201 STUN client unit, 202 RTP reception unit, 203 STUN server unit, 204 RTP transmission unit, 221 global address inquiry unit, 222 global address reception unit, 241 global address inquiry response unit

Claims (16)

A first information processing device, a communication control device connected to the first information processing device on a first side, and a first information processing device connected to a second side of the communication control device via a network; In a network system including a second information processing device that exchanges information with the information processing device,
From the first information processing device to the second information processing device, a first unique information which is unique information on the first side of the communication control device, and a service in the communication control device. Request means for requesting notification of first identification information for identification;
When the communication control device receives the request from the request means, the second unique information that is unique information on the second side of the first information processing device and the second unique information in the first information processing device First transfer means for converting the second identification information for identifying the service to the first unique information and the first identification information, and transferring the request to the second information processing apparatus When,
When the second information processing device receives the request by the first information processing device transferred from the first transfer unit, the requested first unique information and the first identification Response output means for outputting a response including a notification of information to the first information processing apparatus;
When the communication control device receives the response from the response output unit, the communication control device converts the first unique information and the first identification information into the second unique information and the second identification information. Second transfer means for transferring the response to the first information processing device;
Response receiving means for receiving the response from the second information processing device transferred from the second transfer means,
When the transmission of the information is started by the second information processing apparatus, the third identification information for identifying the service transmitting the information is replaced with the fourth identification for identifying the service outputting the response. Information transmitting means for setting the same as the information and transmitting the information,
When the communication control device receives the information from the information transmitting unit, the communication control device converts the first unique information and the first identification information into the second unique information and the second identification information. Third transfer means for transferring the information to the first information processing apparatus;
An information receiving unit for receiving the information from the second information processing device transferred from the third transfer unit. The request means transmits the request from a first port including the second identification information,
The first transfer means transfers the request from a second port including the first identification information;
The response output means outputs the response from a third port including the fourth identification information,
The second transfer means transfers the response from the second port,
The response receiving means receives the response at the first port,
The information transmitting unit transmits the information from the third port including the third identification information,
The third transfer means transfers the information from the second port,
The network system according to claim 1, wherein the information receiving unit receives the information at the first port. The first unique information is a global IP address,
The second unique information is a local IP address,
The first identification information is a port number of a port on which the communication control device provides communication service,
The second identification information is a port number of a port through which the first information processing device provides communication service,
The third identification information is a port number of a port that performs a service for transmitting the information by the second information processing device,
2. The network system according to claim 1, wherein the fourth identification information is a port number of a port that performs a service for outputting the response from the second information processing apparatus. A first information processing device, a communication control device connected to the first information processing device on a first side, and a first information processing device connected to a second side of the communication control device via a network; In a communication method of a network system including a second information processing device that exchanges information with an information processing device,
From the first information processing device to the second information processing device, a first unique information which is unique information on the first side of the communication control device, and a service in the communication control device. Requesting a request for notification of first identification information for identification;
When the communication control device receives the request by the processing of the requesting step, the second unique information, which is unique information on the second side of the first information processing device, and the first information processing device First transfer for converting second identification information for identifying a service within the first into the first unique information and the first identification information, and transferring the request to the second information processing apparatus Steps and
When the second information processing device receives the request by the first information processing device transferred by the processing of the first transfer step, the requested first unique information and the first A response output step of outputting a response including a notification of the identification information to the first information processing apparatus;
When the communication control device receives the response by the process of the response output step, the communication control device converts the first unique information and the first identification information into the second unique information and the second identification information. A second transfer step of transferring the response to the first information processing apparatus;
A response receiving step of receiving the response from the second information processing device transferred by the processing of the second transfer step;
When the transmission of the information is started by the second information processing apparatus, the third identification information for identifying the service transmitting the information is replaced with the fourth identification for identifying the service outputting the response. Setting the same as the information, an information transmitting step of transmitting the information,
When the communication control device receives the information transmitted by the process of the information transmitting step, the first unique information and the first identification information are replaced with the second unique information and the second identification information. A third transfer step of converting the information to the first information processing apparatus;
An information receiving step of receiving the information from the second information processing device transferred by the processing of the third transfer step. Another information processing device connected to a network via a communication control device, and an information processing device for exchanging information via the network,
A request for notification of first unique information, which is information unique to the communication control device, transmitted from the other information processing device, and first identification information for identifying a service in the communication control device. Request receiving means for receiving;
In response to the request for notification of the first unique information and the first identification information received by the request receiving unit, notification of the first unique information and the first identification information of the communication control device. Response output means for outputting a response including
Information transmitting means for transmitting the information to the other information processing apparatus,
The information transmitting means may include second identification information for identifying a service of the information processing apparatus that outputs the information, and a second identification information of the information processing apparatus for identifying a service that outputs the response. An information processing apparatus, wherein the information is the same as the third identification information. In the request for notification of the first unique information and the first identification information received by the request receiving unit, the first unique information of the communication control device and the 1 information, and as information indicating the transmission destination, the second unique information that is information unique to the information processing apparatus and the third identification information for identifying a service in the information processing apparatus are included. Included
The response output by the response output means and including the notification of the first unique information and the first identification information of the communication control device includes, as information representing a transmission source, the second unique information and The first identification information and the first identification information of the communication control device are included as information indicating a transmission destination, including third identification information,
The information transmitted by the information transmitting means includes the second unique information and the second identification information as information indicating a transmission source, and the information of the communication control device as information indicating a transmission destination. The information processing apparatus according to claim 5, wherein the information processing apparatus includes first unique information and the first identification information. The first unique information is a global IP address,
The second unique information is a global IP address,
The first identification information is a port number of a port on which the communication control device provides communication service,
The second identification information is a port number of a port that performs a service for transmitting the information by the information processing device,
7. The information processing apparatus according to claim 6, wherein the third identification information is a port number of a port that performs a service for outputting the response. Another information processing apparatus connected to a network via a communication control apparatus, and an information processing method of an information processing apparatus for exchanging information via the network,
A request for notification of first unique information, which is information unique to the communication control device, transmitted from the other information processing device, and first identification information for identifying a service in the communication control device. A request receiving step to receive;
In response to the request for notification of the first unique information and the first identification information received in the processing of the request receiving step, the first unique information and the first identification information of the communication control device are provided. A response output step of outputting a response including a notification of
Information transmission step of transmitting the information to the other information processing apparatus,
The process of the information transmitting step includes: providing second identification information for identifying a service of the information processing apparatus that outputs the information; and processing of outputting the response by the processing of the response output step of the information processing apparatus. An information processing method, wherein the information is the same as the third identification information for identification. Another information processing device connected to a network through a communication control device, a computer-executable program that controls an information processing device that transmits and receives information via the network,
A request for notification of first unique information, which is information unique to the communication control device, transmitted from the other information processing device, and first identification information for identifying a service in the communication control device. A request receiving step to receive;
In response to the request for notification of the first unique information and the first identification information received in the processing of the request receiving step, the first unique information and the first identification information of the communication control device are provided. A response output step of outputting a response including a notification of
Information transmission step of transmitting the information to the other information processing apparatus,
The process of the information transmitting step includes: providing second identification information for identifying a service of the information processing apparatus that outputs the information; and processing of outputting the response by the processing of the response output step of the information processing apparatus. A program characterized by being the same as third identification information for identification. A first information processing device, a communication control device connected to the first information processing device on a first side, and a first information processing device connected to a second side of the communication control device via a network; In a network system including a second information processing device that exchanges information with the information processing device,
From the first information processing device to the second information processing device, a first unique information which is unique information on the first side of the communication control device, and a service in the communication control device. Request means for requesting notification of first identification information for identification;
When the communication control device receives the request from the request means, the second unique information that is unique information on the second side of the first information processing device and the second unique information in the first information processing device First transfer means for converting the second identification information for identifying the service to the first unique information and the first identification information, and transferring the request to the second information processing apparatus When,
When the second information processing device receives the request by the first information processing device transferred from the first transfer unit, the requested first unique information and the first identification Response output means for outputting a response including a notification of information to the first information processing apparatus;
When the communication control device receives the response from the response output unit, the communication control device converts the first unique information and the first identification information into the second unique information and the second identification information. Second transfer means for transferring the response to the first information processing device;
Response receiving means for receiving the response from the second information processing device transferred from the second transfer means,
An information transmitting unit that transmits the information when the second information processing device starts transmitting the information;
When the communication control device receives the information from the information transmitting unit, the communication control device converts the first unique information and the first identification information into the second unique information and the second identification information. Third transfer means for transferring the information to the first information processing apparatus;
An information receiving unit for receiving the information from the second information processing device transferred from the third transfer unit. The first unique information is a global IP address,
The second unique information is a local IP address,
The first identification information is a port number of a port on which the communication control device provides communication service,
11. The network system according to claim 10, wherein the second identification information is a port number of a port on which the first information processing device provides a communication service. A first information processing device, a communication control device connected to the first information processing device on a first side, and a first information processing device connected to a second side of the communication control device via a network; In a communication method of a network system including a second information processing device that exchanges information with an information processing device,
From the first information processing device to the second information processing device, a first unique information which is unique information on the first side of the communication control device, and a service in the communication control device. Requesting a request for notification of first identification information for identification;
When the communication control device receives the request by the processing of the requesting step, the second unique information, which is unique information on the second side of the first information processing device, and the first information processing device First transfer for converting second identification information for identifying a service within the first into the first unique information and the first identification information, and transferring the request to the second information processing apparatus Steps and
When the second information processing device receives the request by the first information processing device transferred by the processing of the first transfer step, the requested first unique information and the first A response output step of outputting a response including a notification of the identification information to the first information processing apparatus;
When the communication control device receives the response by the process of the response output step, the communication control device converts the first unique information and the first identification information into the second unique information and the second identification information. A second transfer step of transferring the response to the first information processing apparatus;
A response receiving step of receiving the response from the second information processing device transferred by the processing of the second transfer step;
An information transmitting step of transmitting the information when the second information processing apparatus starts transmitting the information;
When the communication control device receives the information transmitted by the process of the information transmitting step, the first unique information and the first identification information are replaced with the second unique information and the second identification information. A third transfer step of converting the information to the first information processing apparatus;
An information receiving step of receiving the information from the second information processing device transferred by the processing of the third transfer step. In an information processing device that exchanges information with another information processing device via a communication control device and a network connected thereto,
Requesting means for requesting notification of identification information for identifying a service in the communication control device, to the other information processing device, unique information that is information unique to the communication control device,
Response receiving means for receiving a response transmitted from the other information processing apparatus, the response corresponding to the request of the requesting means, the response including a notification of the unique information and the identification information,
Information receiving means for receiving information transmitted from the other information processing apparatus,
An information processing apparatus comprising: an information transmission unit that transmits information to the another information processing apparatus. The unique information is a global IP address,
14. The information processing apparatus according to claim 13, wherein the identification information is a port number of a port on which the communication control device provides a communication service. In an information processing device that exchanges information via a network with another information processing device connected to the communication control device,
A request receiving unit that receives a request for notification of identification information for identifying a service in the communication control device, and unique information that is transmitted from the other information processing device and is unique to the communication control device. ,
Response output means for outputting a response including the notification of the unique information and the identification information of the communication control device, in response to the request for notification of the unique information and the identification information received by the request receiving means,
An information processing apparatus comprising: an information transmission unit that transmits information to the another information processing apparatus. The unique information is a global IP address,
16. The information processing apparatus according to claim 15, wherein the identification information is a port number of a port on which the communication control device provides a communication service.

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