CN100502344C

CN100502344C - A bridge method and device

Info

Publication number: CN100502344C
Application number: CNB2007100644155A
Authority: CN
Inventors: 李明; 韩传俊
Original assignee: YINGHANTONG NETWORK TECH Co Ltd BEIJING
Current assignee: BEIJING INHAND NETWORK TECHNOLOGY CO., LTD.
Priority date: 2007-03-14
Filing date: 2007-03-14
Publication date: 2009-06-17
Anticipated expiration: 2027-03-14
Also published as: CN101026535A

Abstract

Especially, being related to data communication area, the invention discloses equipment and method for bridge connection. Using protocol interface process module (PIPM) accomplishes conversion between protocol of data packet accorded with route forwarding module and protocol of local IP interface accorded with network equipment. Using route-forwarding module implements forwarding data packets each other between point-to-point access module and PIPM. Using point-to-point link implements interaction of point-to-point information between point-to-point access module and access server of point-to-point network.

Description

A kind of method and apparatus of bridge joint

Technical field

The present invention relates to the communications field, relate in particular to a kind of method and apparatus of bridge joint.

Background technology

At present, prior network device (for example computer, router) can be supported point-to-point access to some extent, but (for example in the mobile communications network) as a rule also need be finished by the access device of special use when the network equipment inserts point to point network.

At this moment, usually by the network equipment and access device by forming a Local Area Network based on the local data interface of IP interface (for example Ethernet interface or V.35 wait), adopt the schematic diagram that access device finishes point-to-point access as shown in Figure 1, Fig. 1 has provided two network equipments are finished network insertion respectively by access device and access server situation.

In actual applications, the network equipment as shown in Figure 1 has a plurality of.Because point-to-point link can only distribute an IP address for access device, the mode that adopts address transition (NAT) or route usually is a network equipment transmission data:

When the mode that adopts address transition is network equipment transmission data, access device is the source address modification of the packet that the network equipment outside (promptly being sent the direction of data by the network equipment to point to point network) sends the IP of access device, the IP address that the destination address that is mail to the packet of access device by node (the node here refers to the network equipment and access device) outside is revised as the network equipment simultaneously, and this packet is transmitted to the network equipment by access device;

When adopting the mode network equipment transmission data of address transition,, be unsuitable for some applied environment, its range of application is restricted because access device has been revised the source address that network is established the packet of outside transmission.

When the mode that adopts route was network equipment transmission data, access device was transmitted to access server to the packet that the network equipment outwards sends by point-to-point link, was handled or be transmitted to other the network equipment again by access server;

When adopting routing mode, the data communication between a plurality of network equipments need be transmitted data by access server and be finished, and access server need be provided with corresponding route table items.Under the bigger situation of network equipment quantity, need to be provided with a large amount of route table items on the access server, seriously reduced the handling property of access server.

Summary of the invention

Embodiments of the invention provide a kind of method and apparatus of bridge joint, the source address and the data communication between a plurality of network equipment that have solved the outside packet that sends of the needs modification network equipment of prior art scheme need be transmitted the defective that data are finished by access server, effectively enlarge its range of application, and must improve the ability of access server deal with data.

Embodiments of the invention are to be achieved through the following technical solutions:

A kind of device of bridge joint comprises:

The protocol interface processing module is used to finish the protocol conversion of the local IP interface that connects the network equipment;

Routing Forward Module is used to finish the mutual forwarding of packet between point-to-point access module and the protocol interface processing module;

Point-to-point access module is used for realizing point-to-point information interaction by the access server of point-to-point link and point to point network;

After the network equipment inserts point to point network, the network equipment is connected with the access server of point to point network, point-to-point access module obtains the terminal real IP and the server ip at point-to-point link two ends, keep described terminal real IP, simultaneously described terminal real IP is arranged to preassigned IP, the IP of the network equipment is set to this terminal real IP, and described preassigned IP is not within the subnet scoping of the subnet mask of the described real IP and network equipment decision.

A kind of method of bridge joint comprises:

By the protocol interface processing module, finish the conversion of agreement with the agreement of the local IP interface that meets the network equipment of the packet that meets Routing Forward Module;

By Routing Forward Module, realize the mutual forwarding of packet between point-to-point access module and the protocol interface processing module;

By point-to-point link, realize point-to-point information mutual between the access server of point-to-point access module and point to point network;

The technical scheme that provides by the embodiment of the invention described above as can be seen, embodiments of the invention provide a kind of method and apparatus of bridge joint, enlarge its range of application effectively, and must improve the ability of access server deal with data.

Description of drawings

The employing access device that Fig. 1 provides for prior art of the present invention is finished the schematic diagram of point-to-point access;

The structural representation of the device that Fig. 2 provides for the embodiment of the invention;

The schematic flow sheet of the access point to point network that Fig. 3 provides for embodiments of the invention;

The forwarding that Fig. 4 provides for embodiments of the invention is from the schematic flow sheet of the data of local network device;

The forwarding that Fig. 5 provides for embodiments of the invention is from the schematic flow sheet of the packet of point-to-point link.

Embodiment

Embodiments of the invention provide a kind of device of bridge joint, comprise protocol interface processing module, Routing Forward Module and point-to-point access module, its structural representation as shown in Figure 2, wherein:

The protocol interface processing module is used to finish the protocol conversion of the local IP interface that connects the network equipment; Local IP interface can be the interface that can transmit the IP data arbitrarily, as Ethernet interface, synchronous serial interface, asynchronous serial port, V.35 interface or optical fiber interface; This module is used for handling become the IP packet to send to Routing Forward Module from the data transaction of the network equipment, or the IP packet from Routing Forward Module is converted to the data that meet local IP interface protocol sends to the network equipment; This module need be provided with a local IP and subnet mask 1 (NETMASK1) as configuration parameter, and set local IP and subnet mask 1 have determined the scope of local network;

Routing Forward Module is used to finish the mutual forwarding of packet between point-to-point access module and the protocol interface processing module; IP packet from the protocol interface processing module is transmitted to point-to-point access module, sends by point-to-point link by point-to-point access module again, promptly send to the access server of point to point network; Perhaps the IP packet from point-to-point access module is transmitted to the protocol interface processing module, sends to the network equipment by the protocol interface processing module;

Point-to-point access module is used for realizing point-to-point information interaction by the access server of point-to-point link and point to point network; What this module adopted is PPP (point-to-point protocol, Peer To PeerProtocol) or its Extended Protocol (as PPPoE, PPP over Ethernet), before the network equipment does not insert point to point network, be used for the network equipment being linked into point to point network, promptly the network equipment be connected with the access server of point to point network by point-to-point link by point-to-point link (supporting PSTN, xDSL and mobile communications network etc.); After inserting successfully, be after the network equipment inserts point to point network, obtain the real IP and the server ip of the terminal at point-to-point link two ends, this module keeps described real IP stand-by, IP with the terminal of point-to-point link is set to a preassigned IP simultaneously, and this preassigned IP is false IP.

Here need to prove: point-to-point access module keeps the real IP of the terminal of its acquisition, and purpose is that the IP of the network equipment is set to the real IP of this terminal; Why point-to-point access module is set to a false IP with the IP of the terminal of point-to-point link, can select arbitrarily, but need to guarantee that it is not within the scope of local network.

The network equipment of mentioning in the foregoing is not the part of this device, but requires the described network equipment is provided with the real IP that its IP address is the terminal of point-to-point access module acquisition, and subnet mask 2 (NETMASK2) is set simultaneously.Generally speaking, the NETMASK1 of protocol interface processing module setting will equal the NETMASK2 that the network equipment is provided with, but under situation about having, the NETMASK1 of protocol interface processing module setting also can be not equal to the NETMASK2 that the network equipment is provided with.

In addition, the gateway that also needs to be provided with the network equipment is the local IP of protocol interface processing module.

Interface between the network equipment and described device, when just the interface between local network device and the protocol interface processing module is Ethernet interface, the protocol interface processing module only needs to read and write the IP packet and gets final product, and data packet format and content are not needed conversion.

More than the technical scheme of the device that provides for embodiments of the invention.

Embodiments of the invention also provide a kind of technical scheme of method of bridge joint, and described method comprises three big steps:

Step 1 by the protocol interface processing module, is finished the conversion of agreement with the agreement of the local IP interface that meets the network equipment of the packet that meets Routing Forward Module;

Step 2 by Routing Forward Module, realizes the mutual forwarding of packet between point-to-point access module and the protocol interface processing module;

Step 3 by point-to-point link, realizes point-to-point information mutual between the access server of point-to-point access module and point to point network.

These three steps comprise the content of following three aspects:

At first, the network equipment need be inserted point to point network by point-to-point link; Secondly, needing in the future, the data of automatic network equipment are sent to point to point network or will be sent to the network equipment from the packet of point to point network.

Respectively this content of three is described in detail below in conjunction with accompanying drawing 3, accompanying drawing 4 and accompanying drawing 5:

The schematic flow sheet of the access point to point network that Fig. 3 provides for embodiments of the invention comprises the network equipment by the concrete steps that point-to-point link inserts point to point network:

Step 31, the point-to-point link initialization: after the system start-up, the initialization point-to-point link for example detects link-quality etc.;

Step 32, insert point-to-point link: adopt PPP or its Extended Protocol (as PPPoE, PPPover Ethernet), finish the negotiation of point-to-point link two ends (being terminal and access server side) parameter, set up the point-to-point communication link, the network equipment is inserted point to point network by point-to-point link, and point-to-point link is set up when finishing, and point-to-point access module obtains the real IP and the server ip of terminal;

Step 33, the terminal IP that revises point-to-point link is false IP: the IP that is about to the terminal of point-to-point link is arranged to a predefined false IP, keeps the real IP of acquired terminal simultaneously;

Step 34 is provided with routed path: the default route path is set to send by point-to-point link, and the routed path that the packet that mails to terminal is set is set to send by protocol interface module;

Step 35, access is finished, and is about to the network equipment and inserts point to point network by point-to-point link.

The forwarding that Fig. 4 provides for embodiments of the invention is from the schematic flow sheet of the data of local network device, and the data of the automatic network equipment concrete steps that are sent to point to point network comprise in the future:

Step 41 is received the data from the network equipment: receive data from local network device from local IP interface;

Step 42, be converted to the IP packet: the data from local network device that receive are converted to the IP packet, here need to prove that the data transaction that the essence that described data from local network device are converted to the IP packet is to meet the local IP interface protocol of local network device becomes to meet the packet of the procotol that point to point network adopts;

Step 43, routing forwarding: determine the pass-through mode of IP packet by the Route Selection of acquiescence, the result of Route Selection should provide by point-to-point link and sent this moment;

Step 44 sends by point-to-point link: the IP packet through routing forwarding is sent by point-to-point link, promptly be sent to the access server of point to point network;

Step 45 is finished the forwarding of data from the network equipment, is about to be sent to point to point network from the data of the network equipment.

The forwarding that Fig. 5 provides for embodiments of the invention is from the schematic flow sheet of the packet of point-to-point link, and the concrete steps that will be sent to the network equipment from the packet of point to point network comprise:

Step 51 is received the packet from point-to-point link: receive the IP packet that mails to local network device from point-to-point link;

Step 52, routing forwarding: determine the forward-path of IP packet by the Route Selection of acquiescence, the result of Route Selection should provide by local IP interface the IP packet was sent to local network device this moment;

Step 53, send by local IP interface: the protocol interface processing module sends to the network equipment to the data that the IP packet converts the agreement that meets local IP interface to;

Step 54 is finished the forwarding from the packet of point-to-point link, is about to be sent to the network equipment from the packet of point to point network.

In sum, embodiments of the invention provide a kind of apparatus and method of bridge joint, can provide the support that inserts point to point network by point-to-point link for all network equipments based on the IP interface, enlarged the range of application of the device of described bridge joint simultaneously, the technical scheme of a complete transparent access point to point network is provided for application; The technical scheme that embodiments of the invention provide also is applicable to large-scale network; The technical scheme that embodiments of the invention provide only needs packet is carried out simple routing forwarding, has improved the operating efficiency of bridge joint.

So far, the preferred embodiment that the present invention only provides with the embodiment of the invention is that example has illustrated the technical scheme that the embodiment of the invention provides, but the present invention is not only limited to this embodiment, all finish the conversion of agreement with the agreement of the local IP interface that meets the network equipment of the packet that meets Routing Forward Module based on by the protocol interface processing module; By Routing Forward Module, realize the mutual forwarding of packet between point-to-point access module and the protocol interface processing module; By point-to-point link, realize the mutual technical scheme of the point-to-point information between the access server of point-to-point access module and point to point network, no matter which kind of form of employing, all within protection scope of the present invention.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims

1. A bridging device, characterized in that it comprises:

The protocol interface processing module is used to complete the protocol conversion of the local IP interface connected to the network device;

The routing and forwarding module is used to complete the mutual forwarding of data packets between the point-to-point access module and the protocol interface processing module;

The point-to-point access module is used to realize point-to-point information interaction with the access server of the point-to-point network through the point-to-point link;

After the network device is connected to the point-to-point network, the network device is connected to the access server of the point-to-point network, and the point-to-point access module obtains the real IP of the terminal and the server IP at both ends of the point-to-point link, retains the real IP of the terminal, and simultaneously connects the terminal to the The real IP is set to a pre-designated IP, and the IP of the network device is set to the real IP of the terminal, and the pre-designated IP is not within the subnet range determined by the real IP and the subnet mask of the network device.

2. The device according to claim 1, characterized in that the protocol interface processing module is used to convert the data from the network equipment into IP data packets, and send them to the point-to-point access module via the routing forwarding module; The IP data packet of the routing and forwarding module is converted into data conforming to the local IP interface protocol and sent to the network device.

3. The device according to claim 1, wherein the local IP interface includes an Ethernet interface or a synchronous serial port or an asynchronous serial port or a V.35 interface or an optical fiber interface.

4. The device according to claim 1, characterized in that the routing forwarding module is used to forward the data packet from the protocol interface processing module to the point-to-point access module, and send it to the access server of the point-to-point network through the point-to-point link and/or, for forwarding the data packet from the point-to-point access module to the protocol interface processing module, and sending it to the network device through the protocol interface processing module.

5. The device according to claim 1, characterized in that, when the network equipment is not connected to the P2P network, the P2P access module is used to connect the network equipment to the P2P network through a P2P link, using the P2P protocol or PPP PPP-based extension protocol;

After the network device accesses the point-to-point network, the point-to-point access module is used to send the data packet from the routing forwarding module to the access server of the point-to-point network through the point-to-point link, or to send the data packet from the point-to-point network The packet is forwarded to the protocol interface processing module via the routing forwarding module.

6. A bridging method, comprising:

Through the protocol interface processing module, the conversion of the protocol conforming to the data packet of the routing forwarding module and conforming to the protocol of the local IP interface of the network device is completed;

Through the routing and forwarding module, the mutual forwarding of data packets between the point-to-point access module and the protocol interface processing module is realized;

Through the point-to-point link, the interaction of point-to-point information between the point-to-point access module and the access server of the point-to-point network is realized;

7. The method according to claim 6, characterized in that, the step of completing the protocol conversion of the protocol conforming to the data packet of the routing forwarding module and conforming to the protocol conversion of the local IP interface of the network device through the protocol interface processing module comprises:

Convert the data from the network device into IP packets, and send them to the point-to-point access module via the routing forwarding module;

Or convert the IP data packet from the routing and forwarding module into data conforming to the protocol of the local IP interface and send it to the network device.

8. The method according to claim 6, wherein the step of implementing the mutual forwarding of data packets between the point-to-point access module and the protocol interface processing module through the routing forwarding module comprises:

forwarding the data packet from the protocol interface processing module to the point-to-point access module through the routing forwarding module;

And/or forward the data packet from the point-to-point access module to the protocol interface processing module through the routing and forwarding module, and send it to the network device through the protocol interface processing module.

9. The method according to claim 6, characterized in that, when the network equipment is not connected to the P2P network, the P2P access module connects the network equipment to the P2P network through a P2P link, and adopts PPP or PPP-based extension protocol;

After the network device accesses the point-to-point network, the point-to-point access module sends the data packet from the routing and forwarding module to the access server of the point-to-point network through the point-to-point link, or forwards the data packet from the point-to-point network to the The protocol interface processing module sends it to the network device through the protocol interface processing module.