JP5522374B2 - COMMUNICATION MANAGEMENT CONTROL METHOD, COMMUNICATION MANAGEMENT CONTROL DEVICE, AND COMMUNICATION MANAGEMENT CONTROL PROGRAM - Google Patents

Description

  The present invention relates to a communication management control method, a communication management control apparatus, and a communication management control program that are suitable for use when a new network terminal is installed in an existing communication network system.

  FIG. 7 shows an outline of an exemplary configuration of a communication system when accessing the Internet from a home or business. As shown in FIG. 7, a home or office communication facility 1 is connected to a broadband connection provider 3 called ISP (Internet Service Provider) through an optical cable or an ADSL (Asymmetric Digital Subscriber Line) 2, and this broadband connection provider 3 Through the Internet 4.

  In a communication facility 1 at home or office, an optical cable or ADSL 2 is connected to a router 6 through a broadband modem / line terminator 5 composed of, for example, an ONU (Optical Network Unit). The router 6 is connected to a network terminal such as a plurality of personal computers (referred to as PCs in the figure) 7 through a LAN (Local Area Network) made of, for example, Ethernet (registered trademark).

  In this case, connection authentication information (ISP setting information including a password and ID) for the broadband connection provider 3 is set and registered in the router 6, and this connection authentication information is used to pass through the router 6. Data communication with the Internet 4 is possible.

  In this communication system, data communication is performed using a PPPoE (Point to Point Protocol over Ethernet (registered trademark)) protocol, and the router 6 is a PPPoE function compatible device.

  The sequence in PPPoE in this communication system is as shown in FIG. 8 as disclosed in, for example, Japanese Patent Laid-Open No. 2003-333064. The format of the PPPoE frame is as shown in FIG. First, the format of the PPPoE frame in FIG. 9 will be described.

  As shown in FIG. 9, the PPPoE frame includes a destination address “DESTINATION_ADDR”, a source address “SOURCE_ADDR”, a packet type “ETHER_TYPE”, data “payload”, and an error detection checksum “CHECKSUM”. The destination address “DESTINATION_ADDR”, the source address “SOURCE_ADDR”, and the packet type “ETHER_TYPE” are the header part of the PPPoE frame.

  The packet type “ETHER_TYPE” is discrimination information for discriminating between a management packet and a data communication packet. Specifically, when the packet type “ETHER_TYPE” is “0x8863”, this indicates that the packet is a management packet (Discovery Stage (at the start of a PPPoE session)), and “0x8864”. In some cases, the packet indicates a data communication packet (PPP Session Stage (during PPP communication)).

  Accordingly, by identifying which of the above packet types “ETHER_TYPE” is, it is possible to determine whether the packet is a management packet or a data communication packet.

  The data “payload” includes the version “VER”, the type “TYPE”, the code “CODE” indicating the session state of the packet, the session identification information of PPPoE (session ID (Identification)) “SESSION_ID”, and the payload It consists of a header portion consisting of length information “LENGTH” and a payload “payload” as a data portion.

  The session ID is transmission path identification information for identifying a packet transmission path connected between two points to start communication. In this specification, a session refers to the start to end of communication executed between two systems.

  The code “CODE” indicates five session states as shown in FIG. That is, “CODE” includes PADI (PPPoE Active Discovery Initiation), PADO (PPPoE Active Discovery Over), PADR (PPPoE Active Discovery Request), and PADS (CPPE). (Terminate) and any one of the five types of code information.

  Next, a sequence (PPPoE / PPP sequence) for establishing a communication channel in PPPoE will be described with reference to FIG. In FIG. 8, the PPPoE client is the router 6 in FIG. The PPPoE server is a server of the broadband connection provider 3.

  (1) First, the PPPoE client broadcasts a packet for searching for a PPPoE server (“CODE” is a PADI packet; hereinafter referred to as a PADI packet).

  (2) The PPPoE server returns a reply packet ("CODE" is a PADO packet; hereinafter referred to as a PADO packet) to the PPPoE client.

  (3) Since the PPPoE client can specify the PPPoE server by the PADO packet of this response, a packet requesting the session start of the specified PPPoE server (“CODE” is a PADR packet; hereinafter referred to as a PADR packet) Send.

(4) PPPoE server receives this PADR packet, sets the session ID of the transmission path which is to start communications, packet order to you notify the session ID, including the session ID ( "CODE" is PADS packet (hereinafter referred to as PADS packet) is returned to the PPPoE client.

  Through the above sequence (1)-(4) (PPPoE session stage), the PPPoE server specifies the destination address “DESTINATION_ADDR” of the PPPoE client that establishes the session, and sets the session ID and PPPoE of the session ID. Notify the client terminal.

  Following the PPPoE session stage, a PPP session stage sequence is performed.

(5) First, negotiation is performed by LCP (Link Control Protocol) to establish a data link (packet transmission path).
(6) Next, authentication is performed.
(7) Next, PPP negotiation is started, and global IP addresses on the Internet 4 are assigned by IPCP (Internet Protocol Control Protocol) negotiation.
(8) Then, communication by PPP is started.

  Management packets are exchanged between the PPPoE client and the PPPoE server in the above-described PPPoE session stage (1) to (4), and in the subsequent PPP session stage (5) to (8). Packets for data communication are exchanged.

JP 2003-333064 A

  When newly installing a network terminal in the communication equipment of a home or office as described above, generally, a new network terminal is connected under the existing network. For example, in the case of the communication facility 1 described above, a network terminal is connected under the router 6 as in the personal computer 7.

  By the way, in the network in the communication facility 1, it may be desirable to install an additional terminal at a position between the broadband modem / line terminator 5 and the router 6, which is a higher rank of the router 6.

  For example, as shown in FIG. 10, when another network such as an optical telephone network 8 is connected to the communication facility 1, a case where an additional terminal 9 for connecting the other network is provided is an example. . In this case, in order to improve the call quality by detecting the transmission delay fluctuation of the VoIP packet in the VoIP telephone communication through the optical telephone network 8, the additional terminal 9 is inserted above the router 6 and arrives from another network. This is because it is necessary to receive data directly.

  In FIG. 10, two communication paths are shown on the external network side from the WAN (Wide Area Network) side of the additional terminal 9, but this is a virtual communication path. It is composed of a book optical cable and ADSL2.

  The connection of the additional terminal above the router 6 is not limited to the case of connection to another network as in the above example. For example, when an additional network composed of a new terminal group is to be provided in the communication facility 1, an additional network is not installed under the router 6, but the upper level of the router 6 is the same as in the case of FIG. It is better to provide an additional terminal for adding an additional network to the communication facility 1. This is because it is possible to avoid occurrence of communication troubles that may occur when an additional network is connected under the router 6. Further, if an additional terminal is connected to the upper level of the router 6, there is an advantage that it is not necessary to change the setting for the existing network including the router 6.

  However, when the additional terminal 9 is inserted above the router 6 as in the example of FIG. 10, when the additional terminal 9 can perform data communication via the Internet 4, the following problem is caused. There is. In addition, when performing data communication via the Internet 4 from the additional terminal 9, the firmware of the control unit built in the additional terminal 9 is updated via the Internet 4, or the additional network connected to the additional terminal 9 There is a case of data communication from the terminal via the Internet. Here, data communication via the Internet 4 from the additional network terminal includes Internet telephone communication.

  In order to perform data communication via the Internet 4 from the additional terminal 9 as well, it is necessary to construct a route to the Internet 4 via the broadband connection provider 3 that has already contracted. That is, for example, in the example of FIG. 10, it is necessary to generate a communication path that connects the additional terminal 9 to the LAN side port of the router 6.

  For this purpose, the additional terminal 9 includes a WAN port (WAN interface) connected to the broadband modem / line terminator 5 and a LAN 1 port (LAN interface) connected to the WAN side port of the router 6 as well as a router. A LAN2 port (LAN interface) connected to the 6 LAN side ports is required. In other words, the additional terminal 9 needs to have a function of handling the network as a separate network (separate segment) of the three ports of the WAN port, the LAN1 port, and the LAN2 port.

  However, a CPU (Central Processing Unit) with a network function used for the additional terminal 9 is generally provided with one WAN port and one LAN port, each having three ports: a WAN port, a LAN1 port, and a LAN2 port. There are few things to have.

  For this reason, in order to mount the WAN port, the LAN1 port, and the LAN2 port on the additional terminal 9, external components are required for the CPU with a network function, leading to a cost increase.

  In order to avoid this three-port problem, as shown in FIG. 11, the communication path for data communication via the Internet 4 is added to the additional terminal 9 as a path from the existing router 6 and a path to be newly added. It is sufficient to provide a switch 9SW to be switched. FIG. 11 shows an example in which the firmware of the data communication control unit 9A built in the terminal 9 is updated via the Internet 4. The switch 9SW switches between the data communication control unit 9A side and the router 6 side. It is the structure which switches.

  However, when the configuration as shown in FIG. 11 is used, simultaneous communication between the communication via the router 6 and the communication in the data communication control unit 9A cannot be performed, and the broadband connection provider 3 is also provided on the additional terminal 9 side. There is a problem that it is necessary to set and register connection authentication information (password and ID).

  An object of this invention is to provide the method and apparatus which can wipe out the above problem.

In order to solve the above problems, the present invention provides:
Information for connection authentication to a predetermined network is set and a session in the communication path via the predetermined network is established using the connection authentication information, and the data format for the communication path via the predetermined network is set. first device and that turns out preparative spear packets, a communication management control unit that is provided between the predetermined network,
A first input / output interface connected to the first device side;
A second input / output interface connected to the predetermined network side;
During the sequence in which the first device establishes the session, the packet exchanged between the first device and the predetermined network side is monitored, and communication data is exchanged at least in the established session. Monitoring storage means for storing session address information and session identification information for
A discriminating means for discriminating whether or not a separately treated packet to be exchanged separately from a packet from the first device is detected in the established session when the session is established;
When it is determined by the determining means that the separately handled packet is detected, the separately treated packet is routed through the predetermined network including the session address information and session identification information stored in the monitoring storage means. Inserting and sending means for converting to a data format for the communication path , inserting between packets from the first device in the established session, and sending the packets through the second input / output interface;
Communication management means for managing address information of transmission / reception destinations of packets from the first device and the separately handled packets when the session is established;
When it is determined that the packet received through the second input / output interface includes the same session identification information as the session identification information stored in the monitoring storage means when the session is established, The received packet is disassembled, and the received packet is to be passed to the first device using the transmission / reception destination information managed by the communication management means, or the separately handled packet. A judging means for judging whether or not
A packet to be passed to the first device is sent to the first device in accordance with a determination result of the determination unit, and the separate packet is the separate packet when the separate packet is detected by the determination unit. Means for sending to the source of the handling packet;
A communication management control device is provided.

  In the present invention having the above-described configuration, the monitoring device stores the first device between the first device and the predetermined network side during the sequence in which the first device establishes a session in the communication path via the predetermined network. The packet address exchange is monitored, and at least session address information is stored for exchanging communication data through the communication path.

  When a separate packet that is to be communicated through a communication path via a predetermined network but is supposed to be exchanged separately from the packet from the first device is detected by the insertion and transmission means, Is converted into the data format including the session address information stored in the monitoring storage means, and is inserted between the packets from the first device in the established session and is transmitted to the predetermined network side. Sent out.

  Therefore, the separately handled packet is mixed with the original packet exchanged in the session in the session established by the first device and transmitted to the other party.

  In the present invention, the communication management means manages the address information of the transmission / reception destination for the packet from the first device and the separately handled packet when the session is established. When it is determined that the packet received from the predetermined network side is in the data format when the session is established, the received packet is disassembled and transmitted / received managed by the communication management means Using the previous information, it is determined whether the received packet is a packet to be passed to the first device or a separately handled packet.

  Then, according to the determination result, the packet to be passed to the first device is sent to the first device, and the separately handled packet is the source of the separately handled packet when the separately handled packet is detected by the determining means. Is sent out.

  In this way, according to the communication management control device of the present invention, the separately handled packet exchanged separately from the original packet exchanged through the already established session is transmitted through the communication channel as if it were the original packet. It is converted into a possible state, inserted between the original packets, and transmitted / received.

  The communication management control device according to the present invention includes two interfaces, one interface on a predetermined network side (for example, a WAN side interface) and one interface on the first device side (for example, a LAN side interface). It is not necessary to have three interfaces as described in FIG.

  Even if the communication management control device of the present invention is additionally inserted between the predetermined network and the first device, it is not necessary to make any changes to the first device side. For this reason, even when the first device has a LAN configuration and the first device is a router, a new device can be connected without changing the existing network settings of the router at all. There is also an effect.

  According to the communication management control device of the present invention, as in the example of FIG. 11, the connection to the predetermined network is switched between the packet communication from the first device and the communication of the separately handled packet. Instead, the packet from the first device and the separately handled packet can be communicated simultaneously. Moreover, the communication management control device of the present invention has an effect that it is not necessary to store setting information for establishing a session using a predetermined network.

It is a block diagram which shows the outline | summary of the communication system containing embodiment of the communication management control apparatus by this invention. It is a block diagram which shows the hardware structural example of embodiment of the communication management control apparatus by this invention. It is a sequence diagram for demonstrating the processing operation | movement of the principal part in embodiment of the communication management control apparatus by this invention. It is a figure which shows the functional block diagram of the principal part of embodiment of the communication management control apparatus by this invention. It is a flowchart for demonstrating the processing operation in embodiment of the communication management control apparatus by this invention. It is a flowchart for demonstrating the processing operation in embodiment of the communication management control apparatus by this invention. It is a figure which shows the basic structural example of a general communication system. It is a sequence diagram for demonstrating the sequence at the time of the session establishment of PPPoE. It is a figure for demonstrating the frame format of PPPoE. It is a figure which shows the system configuration example for connecting a new terminal with respect to the existing network. It is a figure which shows the other example of the system configuration example for connecting a new terminal with respect to the existing network.

  An embodiment of a communication management control apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a system configuration example of a communication system including a communication management control apparatus according to an embodiment of the present invention. It is an example at the time of using the communication management control device of a form. In FIG. 1, the same parts as those in the communication system of the example of FIG.

  The communication equipment 1 in the communication system of the example of FIG. 1 is provided with the communication management control device 10 of this embodiment instead of the additional terminal 9 shown in FIG. The communication management control device 10 includes a WAN interface for connecting to the broadband modem / line termination device 5 and a LAN interface for connecting the router 6 and other devices.

  As described above, the communication management control device 10 is connected to the Internet 4 via a broadband connection provider, and can be connected to a network 81 other than the Internet 4. In the example of FIG. 1, the communication management control device 10 is mainly provided between the router 6 and the broadband modem / line terminator 5 in order to connect to the other network 81. . Of course, in order to allow additional connection of the IP telephone system 20, which is an additional network system, without changing the settings for the existing network connected to the router 6, the communication management control device 10 is connected to the router 6. There is also a reason that it is connected to the upper level of.

  The other device connected to the LAN interface side of the communication management control device 10 may be a single terminal device having a communication function such as a personal computer or a network terminal device. In the example of FIG. 1, an IP (Internet Protocol) telephone system 20 is connected to another device connected to the communication management control device 10 as an example of a network terminal device. In the example of FIG. 1, the IP telephone system 20 is a system capable of so-called Internet telephone via the Internet 4.

A hardware configuration example of the communication management control apparatus 10 is shown in FIG.
The communication management control apparatus 10 according to this embodiment includes a control unit 11, a WAN interface unit 12, and a LAN interface unit 13. The control unit 11 includes a CPU 111 and a memory 112. The memory 112 includes an area for storing a program for routing processing and other various processes, and a work area, and is configured by using a ROM (Read Only Memory) and a RAM (Random Access Memory). .

  The WAN interface unit 12 includes an Ethernet (registered trademark) port 122 and a physical layer function unit 121. The port 122 of the WAN interface unit 12 is connected to the broadband modem / line terminator 5.

  The LAN interface unit 13 includes a switching hub 131 and a plurality of Ethernet (registered trademark) ports 132, 133, and 134 in the illustrated example provided under the switching hub 131.

  In the illustrated example, the port 132 of the LAN interface unit 13 is connected to the WAN side of the router 6, and the port 133 is connected to the IP telephone system 20.

  The CPU 111 executes processing according to the program stored in the memory 112 using the work area of the memory 112. When the processing functions of the CPU 111 are expressed in blocks, the processing functions are roughly provided with a router function unit 101 and a data communication control function unit 102 as shown in FIG.

  The communication management control device 10 of this embodiment includes a data communication control function unit 102 in order to acquire and update its own firmware from a predetermined server via the Internet 4.

  In FIG. 1, a single terminal or a network terminal that accesses another network 81 is not shown.

  In this embodiment, the connection authentication information (ISP setting information) for the broadband connection provider 3 for establishing a session in the communication path 2INT via the broadband connection provider 3 and the Internet 4 is set and registered only in the router 6. It is not necessary to register settings in the communication management control device 10.

  The session Sn of the communication path 2INT via the broadband connection provider 3 and the Internet 4 is a sequence for establishing a session between the router 6 in which the connection authentication information is set and registered and the server of the broadband connection provider 3 (FIG. This is established by executing 8). In this embodiment, when the router 6 is powered on, the PPPoE / PPP sequence for establishing a session on the communication path 2INT shown in FIG. 8 is executed, and the session Sn via the broadband connection provider 3 and the Internet 4 is set. Established. In this embodiment, as long as the router 6 is powered on, the broadband connection provider 3 and the communication path 2INT via the Internet are in a so-called always-connected state in which the session Sn is always established.

  The router function unit 101 of the communication management control device 10 monitors the PPPoE / PPP sequence for establishing the session Sn on the communication path 2INT via the Internet 4 between the router 6 and the server of the broadband service provider 3. At that time, the router function unit 101 acquires and stores information (information such as a global IP address and a session ID) for transmitting the PPPoE packet in the session Sn on the communication path 2INT.

  In this embodiment, the communication management control device 10 physically has only one LAN port (LAN interface) for the CPU 111. However, in this embodiment, in a state where the communication path 2INT is established, the CPU 111 logically behaves as having two LAN ports, a LAN1 port and a LAN2 port.

  In other words, in this embodiment, the logical LAN 1 port viewed from the CPU 111 is used for input / output of an original packet to the router 6 (hereinafter referred to as an original packet). In addition, the logical LAN 2 port is a “separately handled packet” originally intended to be exchanged separately from the packet, and is used for input / output of a packet to be communicated in the session Sn established on the communication path 2 INT.

In this embodiment, packets from the IP telephone system 20 received by the communication management control device 10 and packets from the data communication control function unit 102 are treated separately.

  As will be described later, in this embodiment, in the router function unit 101 of the communication management control device 10, the separately handled packets are originally mixed with the packets in the session Sn established in the communication path 2INT through the Internet 4. Insert to perform data communication.

  In this embodiment, the router function unit 101 configured by the CPU 111 of the communication management control device 10 determines whether a packet received from the LAN interface unit 13 is originally a packet in a state where the session Sn is established on the communication path 2INT. And detecting means (discriminating means) for detecting (discriminating) whether the packet is a separately handled packet.

In this embodiment, the original packet exchanged between the communication management control device 10 and the router 6 is a PPPoE packet. On the other hand, the packet from the IP telephone system 20 received by the communication management control device 10 and the packet from the data communication control function unit 102 are IP packets in the Ethernet frame format.

  Therefore, in this embodiment, discrimination between the original packet and the separately handled packet in the router function unit 101 is performed by discriminating the difference in the data format of the packet. That is, when the session Sn in the communication path 2INT is established and the data format of the packet from the LAN interface unit 13 is the PPPoE frame format, the router function unit 101 receives the packet from the logical LAN 1 port. Judged as a packet.

  In addition, when the session Sn in the communication path 2INT is established and the data format of the packet from the LAN interface unit 13 is the Ether frame format, the router function unit 101 receives the packet from the logical LAN 2 port. Judged as a packet.

  In this embodiment, the data communication control function unit 102 does not appear in the hardware configuration of FIG. 2, but the packet from the data communication control function unit 102 is similar to the packet from the switching hub 131 in the LAN interface. It is handled as an input packet from the unit 13 side, and is determined as a separately handled packet by the router function unit 101.

  Then, the router function unit 101 executes a predetermined process according to the logical LAN 1 or the logical LAN 2 determined for the packet received through the LAN interface unit 13 in a state where the session Sn on the communication path 2INT is established.

  That is, the router function unit 101 disassembles the PPPoE packet for the original packet from the logical LAN 1 port, registers the source and destination information in the communication management unit, and then regenerates the PPPoE packet again. Then, the data is transmitted to the other party through the WAN interface unit 12 in the session Sn established in the communication path 2INT. The reason why the information of the transmission source and the other party is registered in the communication management unit is to determine the other party packet for the original packet from the WAN interface unit 12.

  Further, the router function unit 101 monitors the PPPoE packet obtained by monitoring the PPPoE / PPP sequence for establishing the session Sn in the communication path 2INT via the Internet 4 for the separately handled packet from the logical LAN 2 port. Using information for transmission in the session Sn established in the communication path 2INT, the information is converted into a PPPoE packet that can be transmitted in the session Sn.

  Then, the router function unit 101 inserts the generated PPPoE packet (separately handled packet) between the original packets (PPPoE packets) from the router 6, and is established in the communication path 2 INT through the WAN interface unit 12. To the other party in the session Sn.

  For this separately handled packet, information on the transmission source and the other party is registered in the communication management unit in order to determine the other party packet from the WAN interface unit 12.

  FIG. 3 shows a sequence example of the processing flow so far. In the sequence example of FIG. 3, “ISP” indicates the server of the broadband service provider 3, “existing network” indicates the router 6 and a plurality of network terminals under it, and “additional network” indicates the IP telephone system 20. Show.

  As shown in FIG. 3, first, a PPP LCP sequence is followed by a PPPoE sequence (corresponding to (1) to (4) in FIG. 8) between the router 6 of the existing network and the server of the broadband service provider 3. (Corresponding to (5) in FIG. 8), a PPP authentication sequence (corresponding to (6) in FIG. 8), and a PPP IPCP sequence (corresponding to (7) in FIG. 8). Establish Sn.

  The router function unit 101 of the communication management control device 10 of this embodiment monitors the PPPoE / PPP sequence and transmits information for transmitting the PPPoE packet in the session Sn on the communication path 2INT (such as a global IP address and a session ID). Information) is acquired and stored.

  When the original packet data from the existing network including the router 6 is generated, the original packet data (PPPoE packet) is transferred to the session Sn via the router function unit 101 of the communication management control device 10 of this embodiment. At the server of the broadband connection provider 3.

  When the router function unit 101 detects a separately handled packet from the IP telephone system 20 as an additional network in the communication management control device 10 in a state where the session Sn is established in the communication path 2INT, as described above, Then, using the information acquired and stored at the time of monitoring the PPPoE / PPP sequence, the separate handling packet is converted into a PPPoE packet that is handled in the same manner as the original packet data exchanged in the session Sn.

  Then, the router function unit 101 inserts the converted PPPoE packet between the original packet data in the session Sn and sends it to the server of the broadband service provider 3. In the example of FIG. 3, packets are originally sent from the router 6 in order of sequence numbers, such as PPP · seq 1, PPP · seq 2, PPP · seq 3,. Separately handled packets are inserted between PPP · seq1 and PPP · seq2 of the packet to become PPP · seq1, PPP · seq2, and PPP · seq3.

  At this time, the router function unit 101 once decomposes the original packet of the PPPoE packet in order to manage the transmission source and the other party, obtains and stores the transmission source and the other party, and then again. , A PPPoE packet is generated again. The router function unit 101 also acquires and stores a transmission source and a destination for separately handled packets.

  In this way, the separately handled packet is inserted between the original packets from the existing network and transmitted via the broadband connection provider 3 in the established session by the communication management control device 10 of this embodiment. To be done.

  It should be noted that the router function unit 101 receives other than the PPPoE packet in the PPPoE / PPP sequence for establishing the session Sn of the communication path 2 INT among the packets received from the LAN interface unit 13 and the communication path other than the communication path established by the router 6. The PPPoE packet to be exchanged through the communication path is transmitted to the WAN interface unit 12 as it is. This process is called a PPPoE bridge process. The router function unit 101 determines whether the packet is for a session of a communication path other than the session Sn of the communication path 2 INT established by the router 6 based on the session ID included in the header of the PPPoE packet.

  As described above, packets from the logical LAN 1 port and the logical LAN 2 port are transmitted to different counterparts through the same communication path 2 INT, but packets from the different counterparts are also mixed in the same session. Come back. The router function unit 101 of the communication management control device 10 of this embodiment separates the packet sent to the logical LAN 1 port and the packet sent to the logical LAN 2 port from the PPPoE packet received through the WAN interface unit 12. It has the function to make.

  That is, when the router function unit 101 receives a PPPoE packet from the WAN interface unit 12 in a state where the session Sn is established on the communication path 2INT, the packet is transmitted to the logical LAN1 port and the logical LAN2 port. It is determined whether or not the packet is a session packet mixed with the packet to be transmitted to (whether it is a target session). This can be determined by the session ID included in the PPPoE packet received from the WAN interface unit 12.

  When it is determined that the received packet is a packet of the target session, the router function unit 101 decomposes the PPPoE packet and logically refers to information on a transmission source and a destination stored in a communication management memory described later. It is determined whether the packet is for the L1 port or the logical L2 port.

  When it is determined that the packet is for the logical L1 port, the router function unit 101 changes the packet to be passed to the existing network of the router 6, regenerates it into a PPPoE packet, and sends it to the router 6. Send it out.

  Also, when it is determined that the packet is for the logical L2 port, the router function unit 101 changes the packet to pass to the IP telephone system 20, for example, and passes it to the IP telephone system 20.

  When the packet for the logical L2 port is not for the IP telephone system 20 but for the data communication control function unit 102 of the communication management control device 10, the router function unit 101 uses the data communication control function. Change to pass to the unit 102. The data communication control function unit 102 executes processing such as firmware update using the received packet data. The processing of the data communication control function unit 102 is actually software processing by the CPU 111 of the communication management control device 10.

[Function block diagram and description of processing flow]
<Functional block diagram>
FIG. 4 shows a more detailed functional block diagram of the router function unit 101 described above.
The router function unit 101 includes a PPPoE / PPP monitoring and control unit 201 and 202, a PPPoE bridge unit 203, a PPPoE / PPP packet decomposition / generation unit 204 and 205, and a routing processing unit 206, as shown in FIG. Become.

  The PPPoE / PPP monitoring and control unit 201 has a determination function for determining whether or not the session Sn is established in the communication path 2INT, a determination function for determining whether or not the packet from the LAN interface unit 13 is a PPPoE packet, and a LAN interface. When the packet from the unit 13 is a PPPoE packet, a determination function is provided for determining whether or not it is a packet of the target session (session Sn). Here, the target session means a session Sn that is intended to exchange packets by originally mixing packets and separately handled packets.

  In the above-described example, it is assumed that the communication path for exchanging packets in the PPPoE frame format is only the communication path 2INT via the Internet through the broadband connection provider 3, and the other network performs the packet in a format other than the PPPoE frame format. . For this reason, the session Sn established in the communication path 2INT automatically becomes the target session.

  However, if another network 81 connected to the communication management control apparatus 10 can exchange packets in the PPPoE frame format, the communication management control apparatus 10 can receive a session of the communication path 2INT via the Internet. It is necessary to set network identification information or the like as setting information that only the target session becomes the target session. That is, it is necessary to register which network the target session is for as setting information.

  For example, when the session Sn regarding the communication path 2INT via the Internet 4 is set as the target session, the identification information regarding the communication path 2INT via the Internet 4 is used as information on the target session. When a session is established for the communication path 2INT via the Internet 4, a flag indicating that the established session is a target session is set based on the identification information, and for other network sessions, a flag indicating a target session is set. Do not stand up. By doing so, it is possible to determine whether or not the session is a target session by referring to the flag.

  The PPPoE / PPP monitoring and control unit 201 sends the received packet from the LAN interface unit 13 to any of the PPPoE bridge unit 203, the PPPoE / PPP packet division / generation unit 204, and the routing processing unit 206 based on the above-described determination function. It has a function of determining whether to transmit and executing packet transmission to the destination of the determination result.

  The PPPoE / PPP monitoring and control unit 201 has a monitoring processing function in the above-described PPPoE / PPP sequence for the packet from the LAN interface unit 13. In other words, the PPPoE / PPP monitoring and control unit 201 performs session establishment monitoring, determines whether the session to be established is the target session Sn, and determines that the session is the target session Sn. When it is determined, session address information for exchanging PPPoE in the session Sn such as a global IP address is acquired and stored.

  In addition, the PPPoE / PPP monitoring and control unit 201 sends information necessary for making the separately handled packet a session Sn packet, such as the acquired session address information, to the routing processing unit 206. The routing processing unit 206 stores the received information such as session address information in the communication management memory 206M described later.

  Further, the PPPoE / PPP monitoring and control unit 201 sends a packet received from any one of the PPPoE bridge unit 203, the PPPoE / PPP packet division / generation unit 204, and the routing processing unit 206 to the LAN interface unit 13 as it is. To do.

  The PPPoE / PPP monitoring and control unit 202 has a determination function for determining whether or not a session Sn is established in the communication path 2INT, a determination function for determining whether or not a packet from the WAN interface unit 12 is a PPPoE packet, and a WAN interface When the packet from the unit 12 is a PPPoE packet, a determination function is provided for determining whether the packet is a packet of the target session (session Sn).

  In addition, the PPPoE / PPP monitoring and control unit 202 receives any of the PPPoE bridge unit 203, the PPPoE / PPP packet division / generation unit 205, and the routing processing unit 206 from the WAN interface unit 12 based on the determination function. It has a function of judging whether to send a packet and executing packet sending to the destination of the judgment result.

  Further, the PPPoE / PPP monitoring and control unit 202 has a monitoring processing function in the above-described PPPoE / PPP sequence for the packet from the WAN interface unit 12. That is, in the same way as PPPoE / PPP monitoring and control unit 201, to acquire and store session address information for exchanging PPPoE in session Sn, and to make a packet of session Sn such as acquired session address information Necessary information is sent to the routing processing unit 206. The routing processing unit 206 stores the received information such as session address information in the communication management memory 206M described later.

  Further, the PPPoE / PPP monitoring and control unit 202 has a function of sending a packet received from any of the PPPoE bridge unit 203, the PPPoE / PPP packet dividing / generating unit 205, and the routing processing unit 206 to the WAN interface unit 12 as it is. Prepare.

  The PPPoE bridge unit 203 has a function of transmitting the PPPoE packet received from the WAN interface unit 12 to the LAN interface unit 13 and a function of transmitting the PPPoE packet received from the LAN interface unit 13 to the WAN interface unit 12.

  The PPPoE / PPP packet decomposition / generation unit 204 has a function of decomposing the PPPoE packet received from the PPPoE / PPP monitoring and control unit 201 and sending it to the logical LAN 1 port of the routing processing unit 206. Also, the PPPoE / PPP packet disassembly / generation unit 204 generates a PPPoE packet from the packet received from the logical LAN 1 port of the routing processing unit 206, passes through the PPPoE / PPP monitoring and control unit 201, and passes through the LAN interface unit 13. It has a function to make it send from.

  The PPPoE / PPP packet disassembly / generation unit 205 has a function of disassembling the PPPoE packet received from the PPPoE / PPP monitoring and control unit 202 and sending it to the logical WAN port of the routing processing unit 206. Also, the PPPoE / PPP packet disassembly / generation unit 205 generates a PPPoE packet from the packet received from the logical WAN port of the routing processing unit 206, passes through the PPPoE / PPP monitoring and control unit 202, and passes through the WAN interface unit 12. It has a function to make it send from.

  The routing processing unit 206 includes a logical LAN 1 port, a logical LAN 2 port, a logical WAN port, and a communication management memory 206M.

  Then, the routing processing unit 206 recognizes the packet received from the logical LAN 1 port as a packet (original packet) of the existing network. Then, it has a function of acquiring the information of the transmission source and the other party originally included in the header of the packet and registering them in the communication management memory 206M.

  Further, the routing processing unit 206 recognizes the packet received from the logical LAN 2 port as a separately handled packet. Then, it has a function of acquiring information on the transmission source and the destination included in the header of the separately handled packet and registering it in the communication management memory 206M.

  Further, the routing processing unit 206 uses the session address information for the target session Sn stored in the communication management memory 206M for the separately handled packets to the same packets as those exchanged in the target session Sn. The function of converting and sending to the PPPoE / PPP packet disassembly / generation unit 205 through the logical WAN port is provided. An example of a process for converting a separately handled packet into a packet similar to a packet exchanged in the target session Sn is, for example, a process of making the PPPoE header the same as the packet exchanged in the target session Sn.

  Further, the routing processing unit 206 has a function of determining whether a packet received from the logical WAN port is a packet for the logical LAN 1 port or a packet for the logical LAN 2 port. This determination function is executed with reference to the information of the transmission source and the other party stored in the communication management memory 206M.

  Then, based on the result of the determination function, the routing processing unit 206 performs a logical LAN1 interface process in which a packet for the logical LAN1 port is a packet to be sent to the router 6, and PPPoE / PPP packet division is performed through the logical LAN1 port. / Send to generation unit 204. The routing processing unit 206 performs logical LAN 2 interface processing in which a packet for the logical LAN 2 port is a packet to be sent to the IP telephone system 20 or the data communication control function unit 102, and the PPPoE / PPP through the logical LAN 2 port. Send to the monitoring and control unit 201.

<Description of processing operation example>
Next, an example of a packet processing operation between the LAN interface unit 13 and the WAN interface unit 12 will be described with correspondence to the processing of each functional block of the router function unit 101 of FIG. 4 described above.

[Flow of processing from LAN interface unit 13 to WAN interface unit 12]
First, an example of processing operation when the router function unit 101 receives a packet from the LAN interface unit 13 and sends it out from the WAN interface unit 12 side will be described with reference to FIG. Note that here, the router function unit 101 also handles a packet from the data communication control function unit 102 built in the communication management control device 10 (IP packet in the ether frame format) as a packet from the LAN interface unit 13. .

  First, when receiving a packet from the LAN interface unit 13 (step S100), the PPPoE / PPP monitoring and control unit 201 determines whether any session including the session Sn in the communication path 2INT has been established (step S100). Step S101).

  When it is determined in step S101 that the session is not established, the PPPoE / PPP monitoring and control unit 201 determines whether or not the received packet is a PPPoE packet (step S102), and is not a PPPoE packet. When it is determined, nothing is performed on the packet, and the packet is directly passed through and sent to the WAN side interface unit 12. The WAN interface unit 12 sends the received PPPoE packet to the broadband modem / line terminator 5 (step S112).

  If it is determined in step S102 that the received packet is a PPPoE packet, the PPPoE / PPP monitoring and control unit 201 determines that the PPPoE packet is a packet for session establishment, and the PPPoE / PPP sequence described above. Is monitored (step S103).

  Then, since the PPPoE / PPP monitoring and control unit 201 passes the received PPPoE packet to the PPPoE bridge unit 203, the PPPoE bridge unit 203 transmits the received PPPoE packet as it is and passes it to the WAN interface unit 12 (step S104). ). The WAN interface unit 12 sends the received PPPoE packet to the broadband modem / line terminator 5 (step S112).

  If the PPPoE / PPP monitoring and control unit 201 determines in step S101 that a session is established, the PPPoE / PPP monitoring and control unit 201 determines whether the received packet is a PPPoE packet (step S105). When it is determined in step S105 that the received packet is a PPPoE packet, the PPPoE / PPP monitoring and control unit 201 determines whether or not the received PPPoE packet is a packet in the target session Sn ( Step S106).

  When it is determined in step S106 that the session is not the target session Sn, the PPPoE / PPP monitoring and control unit 201 passes the received PPPoE packet to the PPPoE bridge unit 203. The PPPoE bridge unit 203 transmits the received PPPoE packet as it is and passes it to the WAN interface unit 12 (step S104). The WAN interface unit 12 sends the received PPPoE packet to the broadband modem / line terminator 5 (step S112).

  If it is determined in step S106 that the session is the target session Sn, the PPPoE / PPP monitoring and control unit 201 recognizes that the received PPPoE packet is a packet of the logical LAN 1 port, and the received PPPoE packet is It passes to the PPPoE / PPP packet decomposition / generation unit 204. The PPPoE / PPP packet decomposition / generation unit 204 decomposes the received PPPoE packet and sends it to the logical LAN 1 port of the routing processing unit 206 (step S107).

  The routing processing unit 206 acquires information such as address information of the transmission source and the other party from the data received through the logical LAN 1 port, and stores it in the communication management memory 206M (step S108). Then, the routing processing unit 206 performs logical LAN1 interface processing that uses the logical LAN1 packet as a packet of the target session Sn to be transmitted through the WAN interface unit 12 (step S109).

  Then, the routing processing unit 206 executes the routing process using the global IP address of the communication management memory 206M (step S110) and sends it to the PPPoE / PPP packet decomposition / generation unit 205. The PPPoE / PPP packet disassembly / generation unit 205 generates PPPoE from the packet received from the logical WAN port of the routing processing unit 206 and passes it to the WAN interface unit 12 (step S111). The WAN interface unit 12 sends the received PPPoE packet to the broadband modem / line terminator 5 (step S112).

  If it is determined in step S105 that the received packet is not a PPPoE packet, the PPPoE / PPP monitoring and control unit 201 recognizes that the received PPPoE packet is a logical LAN 2 port packet and has received it. The PPPoE packet is sent to the logical LAN 2 port of the routing processing unit 206. The routing processing unit 206 acquires information such as address information of the transmission source and the destination from the data received through the logical LAN 2 port, and stores it in the communication management memory 206M (step S113).

  Then, the routing processing unit 206 uses the information in the communication management memory 206M to perform a logical LAN2 interface process in which the logical LAN2 packet is a packet of the target session Sn and is transmitted through the WAN interface unit 12. (Step S114).

  Then, the routing processing unit 206 executes the routing process using the global IP address of the communication management memory 206M (step S110) and sends it to the PPPoE / PPP packet decomposition / generation unit 205. The PPPoE / PPP packet disassembly / generation unit 205 generates PPPoE from the packet received from the logical WAN port of the routing processing unit 206 and passes it to the WAN interface unit 12 (step S111). The WAN interface unit 12 sends the received PPPoE packet to the broadband modem / line terminator 5 (step S112).

[Flow of processing from WAN interface unit 12 to LAN interface unit 13]
Next, an example of processing operation when the router function unit 101 receives a packet from the WAN interface unit 12 and sends it out from the LAN interface unit 13 will be described with reference to FIG.

  First, when receiving a packet from the WAN interface unit 12 (step S200), the PPPoE / PPP monitoring and control unit 202 determines whether any session including the target session Sn in the communication path 2INT is established. (Step S201).

  When it is determined in step S201 that the session is not established, the PPPoE / PPP monitoring and control unit 202 determines whether or not the received packet is a PPPoE packet (step S202).

  When it is determined in step S202 that the received packet is a PPPoE packet, the PPPoE / PPP monitoring and control unit 202 determines that the PPPoE packet is a packet for session establishment, and the PPPoE / PPP sequence described above. Is monitored (step S203).

  Then, since the PPPoE / PPP monitoring and control unit 202 passes the received PPPoE packet to the PPPoE bridge unit 203, the PPPoE bridge unit 203 transmits the received PPPoE packet as it is and passes it to the LAN interface unit 13 (step S204). ). The LAN interface unit 13 sends the received PPPoE packet to the LAN side (step S213).

  When the PPPoE / PPP monitoring and control unit 202 determines in step S201 that a session has been established, the PPPoE / PPP monitoring and control unit 202 determines whether the received packet is a PPPoE packet (step S205). When it is determined in step S205 that the received packet is a PPPoE packet, the PPPoE / PPP monitoring and control unit 202 determines whether or not the received PPPoE packet is a packet in the target session Sn ( Step S206).

  When it is determined in step S 206 that the session is not the target session Sn, the PPPoE / PPP monitoring and control unit 202 passes the received PPPoE packet to the PPPoE bridge unit 203. The PPPoE bridge unit 203 transmits the received PPPoE packet as it is and passes it to the LAN interface unit 13 (step S204). The LAN interface unit 13 sends the received PPPoE packet to the LAN (step S213).

  If it is determined in step S206 that the session is Sn, the PPPoE / PPP monitoring and control unit 202 passes the received PPPoE packet to the PPPoE / PPP packet disassembly / generation unit 205. The PPPoE / PPP packet disassembly / generation unit 205 disassembles the received PPPoE packet and sends it to the logical WAN port of the routing processing unit 206 (step S207).

  At this time, the routing processing unit 206 refers to the communication management memory 206M and performs a routing process to determine to which packet the packet should be sent (step S208).

  Then, the routing processing unit 206 determines whether the packet is output through the logical LAN 1 port (step S209). This determination is performed by referring to the address information of the transmission source and the other party in the communication management memory 206M.

  When the routing processing unit 206 determines in step S209 that the packet is output through the logical LAN 1 port, the routing processing unit 206 passes the packet received from the WAN interface unit 12 to the router 6 through the LAN interface unit 13 in this example. The logical LAN1 interface process is performed and sent to the PPPoE / PPP packet disassembly / generation unit 204 (step S210).

  The PPPoE / PPP packet disassembly / generation unit 204 converts the received packet into a PPPoE packet (step S211) and sends the packet to the LAN interface unit 13. The LAN interface unit 13 sends the received PPPoE packet to the LAN (step S213).

  When the routing processing unit 206 determines in step S209 that the packet is output through the logical LAN 2 port, the packet received from the WAN interface unit 12 is, in this example, the IP telephone system 20 or the data communication control function. A logical LAN2 interface process for passing the data to the unit 102 through the LAN interface unit 13 is performed, and the result is sent to the LAN interface unit 13 (step S212). The LAN interface unit 13 sends the received PPPoE packet to the LAN (step S213).

  When it is determined in step S202 that the packet is not a PPPoE packet, the received packet is transmitted to the LAN.

[Effect of the embodiment]
According to the communication management control device 10 of the embodiment described above, the setting of the router 6 in the existing network under the router 6 is not changed at all, and the communication management control device 10 is added above the router 6. It becomes possible to add a new network terminal. Therefore, a new terminal or a new network terminal can be added to the existing network under the router 6 without any influence.

  Then, according to the communication management control device 10 of this embodiment, by inserting a packet from a new terminal or a new network terminal into a session established by the router 6, the existing network and the new terminal or new network are Simultaneous communication becomes possible.

  According to the communication management control device 10 of this embodiment, the CPU 111 for communication control can be one having one commonly used WAN interface and one LAN interface. In addition, the communication management control device 10 has an advantage that it is not necessary to hold ISP setting information.

[Other Embodiments and Modifications]
In the above-described embodiment, the IP packet from the additional network system connected to the communication management control device 10 through the LAN interface is converted into a PPPoE packet and inserted into the communication path 2INT. An IP packet from an IP telephone system as an example of the system may be communicated not through the Internet 4 but through another network 81 such as an optical telephone network constructed by a telephone carrier. In that case, the communication management control device 10 converts only the data communication packet when the firmware is updated by the data communication control function unit 102 into a PPPoE packet and inserts it into the communication path 2INT. Become.

  In the above-described embodiment, since the network terminal system connected to the communication management control device 10 is an IP telephone system, the packet format difference from the IP telephone system is handled separately. Used to determine whether or not. However, for example, by making it possible to identify an Ethernet (registered trademark) port as a separately handled packet, the present invention is applicable even if the separately handled packet from the network terminal is a PPPoE packet.

  3 ... broadband service provider, 4 ... internet, 5 ... broadband modem / line terminator, 6 ... router, 10 ... communication management control device

Claims (8)

Information for connection authentication to a predetermined network is set and a session in the communication path via the predetermined network is established using the connection authentication information, and the data format for the communication path via the predetermined network is set. first device and that turns out preparative spear packets, a communication management control unit that is provided between the predetermined network,
A first input / output interface connected to the first device side;
A second input / output interface connected to the predetermined network side;
During the sequence in which the first device establishes the session, the packet exchanged between the first device and the predetermined network side is monitored, and communication data is exchanged at least in the established session. Monitoring storage means for storing session address information and session identification information for
A discriminating means for discriminating whether or not a separately treated packet to be exchanged separately from a packet from the first device is detected in the established session when the session is established;
When it is determined by the determining means that the separately handled packet is detected, the separately treated packet is routed through the predetermined network including the session address information and session identification information stored in the monitoring storage means. Inserting and sending means for converting to a data format for the communication path , inserting between packets from the first device in the established session, and sending the packets through the second input / output interface;
Communication management means for managing address information of transmission / reception destinations of packets from the first device and the separately handled packets when the session is established;
When it is determined that the packet received through the second input / output interface includes the same session identification information as the session identification information stored in the monitoring storage means when the session is established, The received packet is disassembled, and the received packet is to be passed to the first device using the transmission / reception destination information managed by the communication management means, or the separately handled packet. A judging means for judging whether or not
A packet to be passed to the first device is sent to the first device in accordance with a determination result of the determination unit, and the separate packet is the separate packet when the separate packet is detected by the determination unit. Means for sending to the source of the handling packet;
A communication management control device comprising: In the communication management control device according to claim 1,
In addition to the first device, another device can be connected to the first input / output interface side.
The determination means determines whether a packet received through the first input / output interface is other than a data format for a communication path via the predetermined network when the session is established, A communication management control device, wherein a packet other than a data format for a communication path via a predetermined network is detected as the separately handled packet. In the communication management control device according to claim 1,
A built-in data communication means for data communication through a communication path via the previous SL predetermined network,
The communication management control apparatus, wherein the determination unit detects a packet from the data communication unit as the separate packet. In the communication management control device according to any one of claims 1 to 3,
The predetermined network is the Internet, a data format for a communication path via the predetermined network is compatible with PPPoE, and the first device is a router compatible with PPPoE. A communication management control device. In the communication management control device according to claim 2,
The first interface includes a plurality of ports and a switching hub. The first device is connected to one of the plurality of ports, and the other device is connected to the plurality of ports. A communication management control device characterized by being connected to one. In the communication management control device according to any one of claims 1 to 5,
In addition to the predetermined network, the data format for the communication path via the predetermined network can be connected to another network having a data format for communication,
When it is determined that the separately handled packet is detected, it is determined whether the established session is a session of the communication path using the predetermined network, and the communication path session using the predetermined network is determined. When it is determined that the communication management control apparatus is, the insertion / transmission means or the determination means is executed.
Information for connection authentication to a predetermined network is set and a session in the communication path via the predetermined network is established using the connection authentication information, and the data format for the communication path via the predetermined network is set. first and apparatus that turns out preparative doing packet, the communication management control device provided between said predetermined network is a communication management control method to be executed,
The monitoring storage means of the communication management control device monitors packets exchanged between the first device and the predetermined network side during the sequence in which the first device establishes the session, A monitoring storage step of storing session address information and session identification information for exchanging communication data in at least the established session;
Whether the determination unit of the communication management control device has detected a separately handled packet that should be exchanged separately from the packet from the first device in the established session when the session is established A discriminating step for discriminating;
When the insertion / transmission unit of the communication management control device determines that the separate packet has been detected in the determination step, the separate packet is stored as the session address information stored in the monitoring storage unit, and The data is converted into a data format for a communication path including the session identification information , inserted between packets from the first device in the established session, and transmitted to the predetermined network side. Inserting and sending process,
A communication management step in which the communication management means of the communication management control apparatus manages address information of transmission / reception destinations of the packet from the first apparatus and the separately handled packet when the session is established;
When the session is established, the determination unit of the communication management control device includes a packet received from the predetermined network side including the same session identification information as the session identification information stored in the monitoring storage step The received packet is disassembled and the received packet is to be passed to the first device using the transmission / reception destination information managed by the communication management means, or A determination step of determining whether the packet is a separate packet;
The transmission means of the communication management control device sends a packet to be passed to the first device according to the determination result in the determination step, and sends the separately handled packet to the first device. A sending step of sending to the source of the separately handled packet when the separately handled packet is detected;
A communication management control method. Information for connection authentication to a predetermined network is set and a session in the communication path via the predetermined network is established using the connection authentication information, and the data format for the communication path via the predetermined network is set. first and apparatus that turns out preparative doing packet, provided between the predetermined network, the is connected to the first input-output interface and the predetermined network side connected to the first device side A computer provided in a communication management control device comprising two input / output interfaces;
During the sequence in which the first device establishes the session, the packet exchanged between the first device and the predetermined network side is monitored, and communication data is exchanged at least in the established session. Monitoring storage means for storing session address information and session identification information for
A discriminating means for discriminating whether or not a separately handled packet to be exchanged separately from a packet from the first device is detected in the established session when the session is established;
When it is determined by the determining means that the separately handled packet is detected, the separately treated packet is routed through the predetermined network including the session address information and session identification information stored in the monitoring storage means. Inserting and sending means for converting to a data format for the communication path , inserting between packets from the first device in the established session, and sending the packets through the second input / output interface;
A communication management means for managing transmission / reception destination address information for the packet from the first device and the separately handled packet when the session is established;
When it is determined that the packet received through the second input / output interface includes the same session identification information as the session identification information stored in the monitoring storage means when the session is established, The received packet is disassembled, and the received packet is to be passed to the first device using the transmission / reception destination information managed by the communication management means, or the separately handled packet. Judgment means to judge whether
A packet to be passed to the first device is sent to the first device in accordance with a determination result of the determination unit, and the separate packet is the separate packet when the separate packet is detected by the determination unit. Means for sending to the source of the handling packet;
Communication management control program to be executed as

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