JP4817797B2 - PPPoE bridge device and PPPoE session disconnection method - Google Patents

Description

  The present invention relates to a PPPoE bridge device that connects a terminal device capable of performing PPPoE communication to a carrier network and a PPPoE session disconnection method thereof.

  PPPoE (Point-to-Point Protocol over Ethernet (registered trademark)) is a method that realizes PPP (Point-to-Point Protocol) connection widely used as a data link layer protocol on Ethernet (registered trademark). Yes, specified in RFC2516 (see Non-Patent Document 1). PPPoE is widely used as a method for connecting user terminals and business facilities in broadband Internet connection services using ADSL (Asymmetric Digital Subscriber Line) and FTTH (Fiber To The Home).

  The following two points can be cited as backgrounds in which PPPoE is widely used. First, by using a PPP authentication method, connection authentication to a provider or service can be performed. Second, the client (user) uses a device ID such as the LAC (L2TP Access Concentrator) or LNS (L2TP Network Server) installed at the operator to perform authentication using the ID including the provider identifier. The provider can be dynamically switched and connected.

  An example of a connection form of a user, a provider (hereinafter referred to as an access provider for distinguishing from a provider), and a provider will be described with reference to FIG. FIG. 6A is a diagram showing a connection form of PPPoE, and FIGS. 6B, 6C, and 6D are protocol stack diagrams in the PPPoE client device, the LAC device, and the LNS device, respectively.

  In FIG. 6A, a PPPoE client device 1 in a user's home is bridge-connected to an LAC device 3 installed in an access provider's building via an access line 2 such as ADSL or FTTH. Here, the PPPoE client device 1 is a device that terminates PPPoE such as application software on a PC or a broadband router.

  As shown in FIG. 6B, in the PPPoE client device 1, a PPP layer is inserted between the MAC (Ethernet (registered trademark)) layer and the IP layer, and between the PPPoE client device 1 and the LAC device 3, PPP communication is possible.

  The PPPoE session started from the PPPoE client device 1 is terminated in the LAC device 3, and the LAC device 3 performs PPP authentication. In the LAC device 3, the PPP packets are aggregated for each connection destination provider by the provider identifier.

  As shown in FIG. 6C, in the LAC device 3, the L2TP layer is inserted below the PPP layer. L2TP is a data link layer protocol for tunneling PPP communications. In addition, as shown in FIG. 6D, there is an L2TP layer below the PPP layer of the LNS device 5, and the LAC device 3 is installed at an interconnection point between the access provider and the providers 6A and 6B. The LNS device 5 is connected by tunneling using L2TP (Layer 2 Tunneling Protocol).

  Finally, in the LNS device 5, the connection destination providers are sorted according to the provider identifier, the PPP encapsulation is released, and the IP packet is transferred to the providers 6A and 6B.

  Next, a PPPoE session connection procedure between the PPPoE client device 1 and the LAC device 3 will be described. FIG. 7 is a sequence diagram showing a PPPoE session connection procedure.

  In starting a PPPoE session, first, in step S10, the PPPoE client apparatus 1 transmits a PADI (PPPoE Active Discovery Initiation) packet as a broadcast packet to the network side in order to search for the LAC apparatus 3.

  Next, in step S20, the LAC device 3 that has received the PADI packet returns a PADO (PPPoE Active Discovery Offer) packet to the PPPoE client device 1 as a response packet to the PADI packet.

Subsequently, in step S30, the PPPoE client apparatus 1 transmits a PADR (PPPoE Active Discovery Request) packet by unicast to the LAC apparatus 3 that has returned the PADO packet, and requests to issue a session ID.

  Next, in step S40, the LAC device 3 transmits a PADS (PPPoE Active Discovery Session Confirmation) packet including the session ID. When the PPPoE client apparatus 1 receives this PADS packet, a PPPoE session is established.

  Thereafter, in step S50, the PPPoE client device 1 and the LAC device 3 perform communication by PPP. Thereafter, the same PPPoE session is managed by the session ID.

  When ending the PPPoE session, in step S60, a PPPoE Active Discovery Session Terminate (PADT) packet requesting PPPoE session termination is transmitted from either the PPPoE client device 1 or the LAC device 3, and the PPPoE session is terminated. To do.

  By the way, if an access provider allows a user to connect an unlimited number of PPPoE sessions, it will affect the equipment cost of the LAC device. Therefore, normally, the upper limit value of the number of PPPoE sessions that can be used simultaneously for one access line contract. Is set.

  At the same time, in order to release an invalid PPPoE session, the LAC device 3 transmits LCP Echo request packets for confirming connectivity to the PPPoE client device 1 at regular time (T) intervals, and continuously n times. When there is no LCP Echo Reply from the PPPoE client device 1, that is, after n × T time has elapsed, the LAC device 3 generally transmits a PADT packet to the PPPoE client device 1 and terminates the PPPoE session. ing.

  Here, in the apparatus having the PPPoE client function installed in the user's home, the PPPoE bridge function is installed so that the terminal connected to the LAN port operates as a PPPoE client simultaneously with terminating the PPPoE session. There is also a device. Such a device is hereinafter referred to as a PPPoE bridge device.

FIG. 8 is a schematic diagram showing a connection form of the PPPoE bridge device. As shown in FIG. 8, the PPPoE bridge device 11 is connected to the LAC device 3 and the PPPoE client devices 7A and 7B. The PPPoE client devices 7A and 7B can be connected to the LAC device 3 through the PPPoE bridge device 11 through PPPoE connection.
IETF RFC2516 “A Method for Transmitting PPP Over Ethernet (registered trademark) (PPPoE)”, February 1999

  Conventionally, a PPPoE bridge apparatus does not have a function of disconnecting a PPPoE session connected to a carrier network at any time by a PPPoE client apparatus connected to the lower part. Therefore, in order to disconnect the PPPoE session of the PPPoE client apparatus connected to the lower part, the PPPoE bridge function is turned off to block the PPPoE packet between the lower PPPoE client network and the LAC apparatus, In general, a method of waiting for the PPPoE session to be disconnected in the LAC device after n × T) has been performed.

  For this reason, there is a problem that it takes a long time to disconnect the PPPoE session of the PPPoE client apparatus connected to the lower part and cannot be disconnected at any time.

  The present invention has been made in view of the above, and provides a PPPoE bridge device and a PPPoE session disconnection method capable of reducing the time required for disconnecting a PPPoE session of a PPPoE client device connected to a lower part and performing disconnection at any time. For the purpose.

In order to achieve the above object, the invention described in claim 1 is connected to a LAC device that distributes concentrated access for each connection destination, and is connected to a PPPoE client device that establishes a PPPoE session with the LAC device. A PPPoE session formed between the LAC device and the PPPoE client device in a PPPoE bridge device that includes a bridge function unit that connects the LAC device and the PPPoE client device, and the device itself also operates as a PPPoE client. The data acquisition means for acquiring the ID, the MAC address of the LAC device, and the MAC address of the PPPoE client device from a packet exchanged between the LAC device and the PPPoE client device, and the data acquisition means A first end request packet including the MAC address of the LAC device as a destination MAC address, the MAC address of the PPPoE client device as a source MAC address, and the session ID acquired by the data acquisition means as its own session ID; A second address including the MAC address of the PPPoE client device acquired by the data acquisition unit as a destination MAC address, the MAC address of the LAC device as a source MAC address, and the session ID acquired by the data acquisition unit as a local session ID. A packet generation means for generating a termination request packet, and after the connection between the LAC device and the PPPoE client device is disconnected by the bridge function unit, the first termination request packet is transmitted to the LAC device, Said Characterized in that it comprises a a termination request packet transmitting means for transmitting to said PPPoE client device.

  According to a second aspect of the present invention, the data acquisition means includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. The packet is acquired from a PPPoE packet exchanged between the LAC device and the PPPoE client device.

  According to a third aspect of the present invention, the data acquisition means includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. , Obtained from the PADR packet in the connection procedure by the PPPoE protocol.

  According to a fourth aspect of the present invention, the data acquisition means includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. The packet is acquired from a PPPoE packet exchanged after establishing a PPPoE session between the LAC device and the PPPoE client device.

  According to a fifth aspect of the present invention, the data acquisition means includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. , And obtained from a connectivity confirmation packet transmitted from the LAC device.

  The invention according to claim 6 is connected to a LAC device that distributes concentrated access for each connection destination, is connected to a PPPoE client device that establishes a PPPoE session with the LAC device, and the LAC device and the PPPoE client In a PPPoE bridge device that includes a bridge function unit for connecting the device and the device itself also operates as a PPPoE client, after the connection between the LAC device and the PPPoE client device is disconnected by the bridge function unit, the LAC device The MAC address, the MAC address of the PPPoE client device, and the session ID of the PPPoE session used before the connection between the LAC device and the PPPoE client device is disconnected from the LAC device to the PPPoE client device. The data acquisition means acquired from the connectivity confirmation packet transmitted or the connectivity confirmation packet transmitted from the PPPoE client apparatus to the LAC apparatus, and the MAC address of the LAC apparatus acquired by the data acquisition means as the destination MAC A first termination request packet including the address, the MAC address of the PPPoE client device as a source MAC address, and the session ID acquired by the data acquisition unit as its own session ID, and the PPPoE client acquired by the data acquisition unit A packet for generating a second end request packet including the MAC address of the device as a destination MAC address, the MAC address of the LAC device as a source MAC address, and the session ID acquired by the data acquisition unit as its own session ID. And preparative generating means, transmits the first end request packet to the LAC device, and a sending means for sending the second end request packet to the PPPoE client device.

  The invention according to claim 7 is connected to a LAC device that distributes concentrated access for each connection destination, is connected to a PPPoE client device that establishes a PPPoE session with the LAC device, and the LAC device and the PPPoE client In a PPPoE session disconnection method of a PPPoE bridge device that includes a bridge function unit that connects the device, and the device itself also operates as a PPPoE client, a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, A data acquisition step for acquiring the MAC address of the LAC device and the MAC address of the PPPoE client device from a packet exchanged between the LAC device and the PPPoE client device, and this data acquisition First termination request including the MAC address of the LAC device acquired in step as the destination MAC address, the MAC address of the PPPoE client device as the source MAC address, and the session ID acquired in the data acquisition step as the own session ID The packet and the MAC address of the PPPoE client device acquired in the data acquisition step are set as a destination MAC address, the MAC address of the LAC device is set as a source MAC address, and the session ID acquired in the data acquisition step is the own session ID. A packet generation step of generating a second termination request packet including the first termination request packet after the bridge function unit disconnects the LAC device from the PPPoE client device. It was transmitted to the LAC device, and a sending step of sending the second end request packet to the PPPoE client device.

  According to an eighth aspect of the present invention, the data acquisition step includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. The packet is acquired from a PPPoE packet exchanged between the LAC device and the PPPoE client device.

  According to a ninth aspect of the present invention, in the data acquisition step, a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. , Obtained from the PADR packet in the connection procedure by the PPPoE protocol.

  The data acquisition step may include a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. The packet is acquired from a PPPoE packet exchanged after establishing a PPPoE session between the LAC device and the PPPoE client device.

  According to an eleventh aspect of the present invention, in the data acquisition step, a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device. , And obtained from a connectivity confirmation packet transmitted from the LAC device.

  The invention according to claim 12 is connected to a LAC device that distributes concentrated access for each connection destination, is connected to a PPPoE client device that establishes a PPPoE session with the LAC device, and the LAC device and the PPPoE client In a PPPoE session disconnection method of a PPPoE bridge device that includes a bridge function unit that connects the device and that operates as a PPPoE client, after the connection between the LAC device and the PPPoE client device is disconnected by the bridge function unit , The MAC address of the LAC device, the MAC address of the PPPoE client device, and the session ID of the PPPoE session used before disconnecting the connection between the LAC device and the PPPoE client device. A data acquisition step acquired from a connectivity confirmation packet transmitted to the PPPoE client device or a connectivity confirmation packet transmitted from the PPPoE client device to the LAC device, and the LAC device acquired in the data acquisition step. A first termination request packet including a MAC address as a destination MAC address, a MAC address of the PPPoE client device as a transmission source MAC address, and the session ID acquired in the data acquisition step as its own session ID; and The acquired MAC address of the PPPoE client device is a destination MAC address, the MAC address of the LAC device is a source MAC address, and the session ID acquired in the data acquisition step is the own session. A packet generating step for generating a second end request packet included as D, and a transmitting step for transmitting the first end request packet to the LAC device and transmitting the second end request packet to the PPPoE client device. It is characterized by having.

  According to the present invention, the session ID of the PPPoE session formed between the LAC device and the PPPoE client device, the MAC address of the LAC device, and the MAC address of the PPPoE client device are exchanged between the LAC device and the PPPoE client device. A first termination request packet including the MAC address of the LAC device as the destination MAC address, the MAC address of the PPPoE client device as the transmission source MAC address, and the session ID acquired from the packet as its own session ID; The second end including the MAC address of the PPPoE client device as the destination MAC address, the MAC address of the LAC device as the source MAC address, and the session ID acquired from the packet as the own session ID. The request packet is generated, the first termination request packet is transmitted to the LAC device, and the second termination request packet is transmitted to the PPPoE client device. Therefore, the time required for disconnecting the PPPoE session of the PPPoE client device connected to the lower part And cutting can be performed at any time.

  The best mode for carrying out the PPPoE bridge apparatus and PPPoE session disconnection method of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a PPPoE bridge device according to a first embodiment of the present invention.

  As shown in FIG. 1, the PPPoE bridge device 11 of this embodiment includes a control unit 12, a WAN port 13, a bridge function unit 14, a recording unit 15, and LAN ports 16 and 17. The WAN port 13 is connected to the LAC device 3 via the access line 2 and outputs a packet transmitted from the LAC device 3 to the control unit 12.

  The bridge function unit 14 has a function of connecting the PPPoE client devices 7A and 7B connected to the PPPoE bridge device 11 via the LAN ports 16 and 17 and the LAC device 3, respectively. Although FIG. 1 shows an example in which two PPPoE client devices are connected, the number of connected PPPoE client devices is not limited to this.

  The control unit 12 includes a packet monitoring unit 121 that monitors packets transmitted from the LAC device 3 or the PPPoE client devices 7A and 7B, a packet identification unit 122 that identifies packets, and the LAC device 3 or the PPPoE client devices 7A and 7B. Generated by the data acquisition unit 123 that acquires the MAC address of the LAC device 3 and the PPPoE client devices 7A and 7B and the session ID of the PPPoE session from the transmitted packet, the packet generation unit 124 that generates the packet, and the packet generation unit 124 And a transmission / reception unit 125 that receives the packets transmitted from the LAC device 3 or the PPPoE client devices 7A and 7B.

  The recording unit 15 records the MAC addresses of the LAC device 3 and the PPPoE client devices 7A and 7B acquired by the data acquisition unit 123 and the session ID of the PPPoE session.

  Next, the operation of the PPPoE bridge device and the PPPoE session disconnection method according to the first embodiment will be described. FIG. 2 is a sequence diagram showing a PPPoE session disconnection method according to the first embodiment of this invention.

  Hereinafter, a case where the PPPoE session between the LAC device 3 and the PPPoE client device 7A is disconnected will be described. First, in step S110, the packet monitoring unit 121 monitors packets exchanged between the LAC device 3 and the PPPoE client device 7A. Then, the packet identification unit 122 determines whether there is a PADR packet transmitted from the LAC device 3 when the PPPoE client device 7A starts a PPPoE session.

  In step S120, when the PADR packet is transmitted from the LAC device 3 and the packet identifying unit 122 determines that the PADR packet is a PADR packet, in step S130, the data acquisition unit 123 determines the LAC device 3 and the PPPoE client from the PADR packet. The session ID of the PPPoE session formed with the device 7A, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3 are read. The recording unit 15 records the session ID read by the data acquisition unit 123, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3.

  Instead of the PADR packet, the session ID, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3 are obtained from the PPPoE packet exchanged between the LAC device 3 and the PPPoE client device 7A after the PPPoE session is established. May be. If the LCP-Echo Request packet is periodically transmitted from the LAC device 3, the session ID, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3 may be acquired from this. Further, the session ID, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3 may be acquired from other PPPoE packets.

  Next, in step S140, the packet generation unit 124 generates two types of PADT packets from the session ID recorded in the recording unit 15, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3.

  FIG. 3 is a diagram showing a PADT packet. As shown in FIG. 3, the PADT packet includes an Ethernet (registered trademark) header, a PPPoE header, a PPPoE payload, and a frame check sequence. The Ethernet (registered trademark) header includes a destination MAC address, a source MAC address, and an ether type. The PPPoE header includes information on version, type, code, session ID of PPPoE session, and data length of PPPoE payload.

  In step S140, the packet generation unit 124 describes the MAC address of the LAC device 3 as the destination MAC address, describes the MAC address of the PPPoE client device 7A as the source MAC address, and records the session ID recorded in the recording unit 15 as the session ID. A PADT packet in which the ID is described is generated as a first PADT packet.

  Further, the packet generation unit 124 describes the MAC address of the PPPoE client device 7A as the destination MAC address, describes the MAC address of the LAC device 3 as the transmission source MAC address, and stores the session ID recorded in the recording unit 15 as the session ID. The described PADT packet is generated as a second PADT packet.

  Next, in step S150, the bridge function unit 14 turns off the PPPoE bridge function and blocks the PPPoE packet conduction between the PPPoE client device 7A and the LAC device 3. Thereafter, in step S160, the transmission / reception unit 125 transmits the first PADT packet to the LAC device 3. In step S170, the transmission / reception unit 125 transmits the second PADT packet to the PPPoE client apparatus 7A.

  Thereafter, in step S180, the packet monitoring unit 121 monitors packets transmitted from the LAC device 3 and the PPPoE client device 7A. Then, the packet identification unit 122 determines whether there is a PADT packet having the same session ID as the first and second PADT packets generated by the packet generation unit 124 among these packets.

  In steps S190 and S200, the PADT packets are transmitted from the LAC device 3 and the PPPoE client device 7A, respectively, and the packet identification unit 122 generates the first and second PADT packets generated by the packet generation unit 124. If it is determined that the packet is a PADT packet having the same session ID, it is confirmed that the PPPoE session is released.

  Thus, according to the PPPoE bridge device and the PPPoE session disconnection method of the first embodiment, the session ID of the PPPoE session formed between the LAC device 3 and the PPPoE client device 7A, the MAC address of the LAC device 3, The MAC address of the PPPoE client device 7A is acquired from a packet exchanged between the LAC device 3 and the PPPoE client device 7A, the MAC address of the LAC device 3 is set as the destination MAC address, and the MAC address of the PPPoE client device 7A is transmitted. The first PADT packet including the session ID acquired from the packet as its own session ID as the original MAC address, and the MAC address of the PPPoE client device 7A as the destination MAC address, and the MA of the LAC device A second PADT packet including the address as the source MAC address and the session ID acquired from the packet as its own session ID, and transmitting the first PADT packet to the LAC device 3; Since the transmission is made to the PPPoE client apparatus 7A, it is possible to shorten the time required for disconnecting the PPPoE session of the PPPoE client apparatus 7A connected to the lower part, and to disconnect at any time.

(Second Embodiment)
The configuration of the PPPoE bridge apparatus of the second embodiment is the same as that of the PPPoE bridge apparatus of the first embodiment shown in FIG.

  The operation of the PPPoE bridge device and the PPPoE session disconnection method according to the second embodiment will be described. FIG. 4 is a sequence diagram showing a PPPoE session disconnection method according to the second embodiment of this invention.

  First, in step S210, the bridge function unit 14 turns off the PPPoE bridge function, and blocks the PPPoE packet conduction between the PPPoE client device 7A and the LAC device 3.

  In step S220, the packet monitoring unit 121 monitors packets transmitted from the LAC device 3 and the PPPoE client device 7A. Then, the packet identification unit 122 determines whether there is an LCP Echo Request packet transmitted from the LAC device 3 or the PPPoE client device 7A among these packets.

  FIG. 5 is a diagram showing an LCP Echo Request packet. As shown in FIG. 5, the LCP Echo Request packet includes an Ethernet (registered trademark) header, a PPPoE header, a PPPoE payload, and a frame check sequence. The Ethernet (registered trademark) header includes a destination MAC address, a source MAC address, and an ether type. The PPPoE header includes information on version, type, code, session ID of PPPoE session, and data length of PPPoE payload. The PPPoE payload is composed of PPP protocol and LCP Echo Request data.

  In step S230, when the LCP Echo Request packet is transmitted from the LAC device 3, and the packet identification unit 122 determines that the LCP Echo Request packet is the LCP Echo Request packet transmitted from the LAC device 3, in step S250, The data acquisition unit 123 reads the MAC address of the LAC device 3 from the transmission source MAC address of the Ethernet (registered trademark) header of the LCP Echo Request packet transmitted from the LAC device 3, and reads the MAC address of the PPPoE client device 7A from the destination MAC address. Read the address.

  Further, the data acquisition unit 123 reads the session ID of the PPPoE session formed between the LAC device 3 and the PPPoE client device 7A from the session ID of the PPPoE header. When a plurality of sessions are used, the LCP Echo Request packet is received for each session, and there are a plurality of session IDs.

  Similarly, when the LCP Echo Request packet is transmitted from the PPPoE client device 7A (step S240) and the packet identifying unit 122 determines that the LCP Echo Request packet is the LCP Echo Request packet transmitted from the PPPoE client device 7A, In step S250, the data acquisition unit 123 reads the MAC address of the PPPoE client device 7A from the transmission source MAC address of the Ethernet (registered trademark) header of the LCP Echo Request packet transmitted from the PPPoE client device 7A, and reads the LAC from the destination MAC address. Read the MAC address of device 3. Further, the data acquisition unit 123 reads the session ID of the PPPoE session formed between the LAC device 3 and the PPPoE client device 7A from the session ID of the PPPoE header.

  Then, the recording unit 15 records the session ID read by the data acquisition unit 123, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3.

  Next, in step S260, the packet generation unit 124 describes the MAC address of the LAC device 3 as the destination MAC address from the session ID recorded in the recording unit 15, the MAC address of the PPPoE client device 7A, and the MAC address of the LAC device 3. Then, a PADT packet in which the MAC address of the PPPoE client apparatus 7A is described as the source MAC address and the session ID recorded in the recording unit 15 as the session ID is generated as the first PADT packet.

  Further, the packet generation unit 124 describes the MAC address of the PPPoE client device 7A as the destination MAC address, describes the MAC address of the LAC device 3 as the transmission source MAC address, and stores the session ID recorded in the recording unit 15 as the session ID. The described PADT packet is generated as a second PADT packet.

  Hereinafter, steps S270 to S310 are the same as steps S160 to S200 of FIG. 2 described in the first embodiment.

  The second embodiment starts monitoring for generating a PADT packet after the PPPoE session needs to be disconnected. Even in this case, the same effect as that of the first embodiment can be obtained. Can do.

It is a block diagram which shows the PPPoE bridge apparatus of the 1st Embodiment of this invention. It is a sequence diagram which shows the PPPoE session cutting | disconnection method of the 1st Embodiment of this invention. It is a figure which shows a PADT packet. It is a sequence diagram which shows the PPPoE session cutting | disconnection method of the 2nd Embodiment of this invention. It is a figure which shows a LCP Echo Request packet. (A) is a diagram showing a connection form of PPPoE, (b) is a protocol stack diagram in the PPPoE client device, (c) is a protocol stack diagram in the LAC device, and (d) is a protocol stack diagram in the LNS device. It is a sequence diagram which shows a PPPoE session connection procedure. It is the schematic which shows the connection form of a PPPoE bridge apparatus.

Explanation of symbols

1, 7A, 7B PPPoE client device 2 Access line 3 LAC device 5 LNS device 6A, 6B Provider 11 PPPoE bridge device 12 Control unit 13 WAN port 14 Bridge function unit 15 Recording unit 16, 17 LAN port 121 Packet monitoring unit 122 Packet identification Unit 123 data acquisition unit 124 packet generation unit 125 transmission / reception unit

Claims (12)

A bridge function unit that connects to a LAC device that distributes concentrated access for each connection destination, connects to a PPPoE client device that establishes a PPPoE session with the LAC device, and connects the LAC device and the PPPoE client device In the PPPoE bridge device in which the device itself operates as a PPPoE client,
A session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device are exchanged between the LAC device and the PPPoE client device. Data acquisition means for acquiring from a packet to be transmitted;
A first including a MAC address of the LAC device acquired by the data acquisition unit as a destination MAC address, a MAC address of the PPPoE client device as a source MAC address, and a session ID acquired by the data acquisition unit as a local session ID And the MAC address of the PPPoE client device acquired by the data acquisition unit as a destination MAC address, the MAC address of the LAC device as a source MAC address, and the session ID acquired by the data acquisition unit Packet generating means for generating a second end request packet included as a session ID;
After the connection between the LAC device and the PPPoE client device is disconnected by the bridge function unit, the first termination request packet is transmitted to the LAC device, and the second termination request packet is transmitted to the PPPoE client device. A PPPoE bridge device comprising: a transmitting means for transmitting.   The data acquisition means includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, a MAC address of the PPPoE client device, and the LAC device and the PPPoE client. The PPPoE bridge apparatus according to claim 1, wherein the PPPoE bridge apparatus is obtained from a PPPoE packet exchanged with the apparatus.   The data acquisition means includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, a MAC address of the PPPoE client device, and a PADR in a connection procedure using a PPPoE protocol. The PPPoE bridge apparatus according to claim 1, wherein the PPPoE bridge apparatus is obtained from a packet.   The data acquisition means includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, a MAC address of the PPPoE client device, and the LAC device and the PPPoE client. 2. The PPPoE bridge device according to claim 1, wherein the PPPoE bridge device is obtained from a PPPoE packet exchanged with a device after a PPPoE session is established.   The data acquisition means transmits a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device from the LAC device. The PPPoE bridge apparatus according to claim 1, wherein the PPPoE bridge apparatus is obtained from a connectivity confirmation packet. A bridge function unit that connects to a LAC device that distributes concentrated access for each connection destination, connects to a PPPoE client device that establishes a PPPoE session with the LAC device, and connects the LAC device and the PPPoE client device In the PPPoE bridge device in which the device itself operates as a PPPoE client,
After the connection between the LAC device and the PPPoE client device is disconnected by the bridge function unit, the MAC address of the LAC device, the MAC address of the PPPoE client device, and before the connection between the LAC device and the PPPoE client device is disconnected. The session ID of the PPPoE session used for the packet is acquired from the connectivity confirmation packet transmitted from the LAC device to the PPPoE client device or the connectivity confirmation packet transmitted from the PPPoE client device to the LAC device. Data acquisition means;
A first including a MAC address of the LAC device acquired by the data acquisition unit as a destination MAC address, a MAC address of the PPPoE client device as a source MAC address, and a session ID acquired by the data acquisition unit as a local session ID And the MAC address of the PPPoE client device acquired by the data acquisition unit as a destination MAC address, the MAC address of the LAC device as a source MAC address, and the session ID acquired by the data acquisition unit Packet generating means for generating a second end request packet included as a session ID;
A PPPoE bridge apparatus comprising: a transmission unit configured to transmit the first termination request packet to the LAC apparatus and transmit the second termination request packet to the PPPoE client apparatus. A bridge function unit that connects to a LAC device that distributes concentrated access for each connection destination, connects to a PPPoE client device that establishes a PPPoE session with the LAC device, and connects the LAC device and the PPPoE client device In the PPPoE session disconnection method of the PPPoE bridge device in which the own device also operates as a PPPoE client,
A session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device are exchanged between the LAC device and the PPPoE client device. A data acquisition step for acquiring from a packet to be transmitted;
A first including the MAC address of the LAC device acquired in the data acquisition step as a destination MAC address, the MAC address of the PPPoE client device as a source MAC address, and the session ID acquired in the data acquisition step as its own session ID The PPPoE client device acquired in the data acquisition step, the MAC address of the PPPoE client device as a destination MAC address, the MAC address of the LAC device as a source MAC address, and the session ID acquired in the data acquisition step A packet generation step of generating a second end request packet including the own session ID;
After the connection between the LAC device and the PPPoE client device is disconnected by the bridge function unit, the first termination request packet is transmitted to the LAC device, and the second termination request packet is transmitted to the PPPoE client device. A PPPoE session disconnecting method comprising: a transmitting step of transmitting.   The data acquisition step includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, a MAC address of the PPPoE client device, and the LAC device and the PPPoE client. The PPPoE session disconnection method according to claim 7, wherein the PPPoE session disconnection method is obtained from a PPPoE packet exchanged with a device.   In the data acquisition step, the session ID of the PPPoE session formed between the LAC device and the PPPoE client device, the MAC address of the LAC device, and the MAC address of the PPPoE client device are displayed in the PADR in the connection procedure using the PPPoE protocol. The PPPoE session disconnection method according to claim 7, wherein the PPPoE session disconnection method is obtained from a packet.   The data acquisition step includes a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, a MAC address of the PPPoE client device, and the LAC device and the PPPoE client. The PPPoE session disconnection method according to claim 7, wherein the PPPoE session disconnection method is obtained from a PPPoE packet exchanged with a device after the PPPoE session is established.   In the data acquisition step, a session ID of a PPPoE session formed between the LAC device and the PPPoE client device, a MAC address of the LAC device, and a MAC address of the PPPoE client device are transmitted from the LAC device. The PPPoE session disconnection method according to claim 7, wherein the PPPoE session disconnection method is obtained from a connectivity confirmation packet. A bridge function unit that connects to a LAC device that distributes concentrated access for each connection destination, connects to a PPPoE client device that establishes a PPPoE session with the LAC device, and connects the LAC device and the PPPoE client device In the PPPoE session disconnection method of the PPPoE bridge device in which the own device also operates as a PPPoE client,
After the connection between the LAC device and the PPPoE client device is disconnected by the bridge function unit, the MAC address of the LAC device, the MAC address of the PPPoE client device, and before the connection between the LAC device and the PPPoE client device is disconnected. The session ID of the PPPoE session used for the packet is acquired from the connectivity confirmation packet transmitted from the LAC device to the PPPoE client device or the connectivity confirmation packet transmitted from the PPPoE client device to the LAC device. A data acquisition step;
A first including the MAC address of the LAC device acquired in the data acquisition step as a destination MAC address, the MAC address of the PPPoE client device as a source MAC address, and the session ID acquired in the data acquisition step as its own session ID End request packet, the MAC address of the PPPoE client device acquired in the data acquisition step is a destination MAC address, the MAC address of the LAC device is a source MAC address, and the session ID acquired in the data acquisition step is A packet generation step of generating a second end request packet included as a session ID;
A PPPoE session disconnecting method comprising: a step of transmitting the first end request packet to the LAC device and transmitting the second end request packet to the PPPoE client device.

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