CN100452746C - Method for determining out interface and multi-switch-in wideband router - Google Patents
Method for determining out interface and multi-switch-in wideband router Download PDFInfo
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- CN100452746C CN100452746C CNB2007100794307A CN200710079430A CN100452746C CN 100452746 C CN100452746 C CN 100452746C CN B2007100794307 A CNB2007100794307 A CN B2007100794307A CN 200710079430 A CN200710079430 A CN 200710079430A CN 100452746 C CN100452746 C CN 100452746C
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Abstract
A method for confirming exit interface includes retransmitting received message when message is received by multi-interface wideband router of WAN interface, confirming that WAN interface received with the response message is exit interface to be used by follow up conversation when response message corresponding to conversation of said message is received.
Description
Technical field
The present invention relates to data communication technology, refer to a kind of method of interface and multiple access broadband router of a kind of many wide area networks (WAN) interface determined especially.
Background technology
The multiple access broadband router of many wan interfaces is the network address translation (nat) equipment that is used to provide a plurality of wan interfaces at present, and it has a plurality of lan interfaces, a plurality of wan interfaces.Wherein, the Local Area Network interface is used to connect the user, and wan interface is used to connect broadband networks.Referring to Fig. 1, Fig. 1 is the multiple access broadband router of many wan interfaces.
Generally, based on the consideration of each side factors such as rate, service quality and network security, the broadband inserting service that a large number of users such as enterprise, Internet bar can select how tame service provider (ISP) to provide usually simultaneously.Like this, the multiple access broadband router of many wan interfaces will connect the network of how tame ISP simultaneously.In the present invention, in order to simplify description, the multiple access broadband router of many wan interfaces is called: many WAN broadband router.
In the prior art, many WAN broadband router receives IP message from the user from LAN interface, and determines to send the wan interface of User IP message according to different multiple access mode of operations.The multiple access mode of operation mainly contains: load-sharing mode, active and standby switch mode and parallel online pattern.Wherein, load-sharing mode is meant: for the IP message that receives from LAN interface, according to the load balancing strategy that pre-sets, each wan interface that is assigned to that the IP message of receiving is average sends, and has realized intelligentized dynamic shunt.Active and standby handover module is meant: the part wan interface in many WAN broadband router is as main interface, remaining as spare interface; When main interface broke down, spare interface replaced main interface work, thereby had improved the stability of equipment.Parallel online pattern is meant: each wan interface works alone, and sends the IP message of fixed-line subscriber.
The multiple access mode of operation of above-mentioned introduction is though can reach bandwidth availability ratio or advantages of higher stability preferably.But above-mentioned multiple access mode of operation all is the performance from many WAN broadband router, does not consider network condition actual in the prior art.In the prior art, bandwidth between the different I SP network is less, therefore when the server of user capture need connect by another ISP network, the very possible generation on the link between two ISP networks goes offline, cause the user can not normally use service, quality of services for users (QoS) can not be protected.Wherein, cause this problem most important reason to be: the wan interface of determining by prior art can not guarantee that its correspondence an available route.
For example, suppose to exist two wan interfaces on many WAN broadband router, wan interface 1 connects the ISP1 network, wan interface 2 connects the ISP2 network.When the user need visit a server on the ISP2 network, according to load-sharing mode of the prior art, active and standby switch mode or parallel online pattern, many WAN broadband router may determine to send by wan interface 1 this user's IP message owing to the performance from self.This just means that user's needs earlier through the ISP1 network, just can have access to the server in the ISP2 network.Because link bandwidth is less between two ISP networks, therefore determine that by this wan interface 1 route may be unavailable.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of determining interface, can make definite outgoing interface correspondence an available route by using method provided by the invention.
In addition, another main purpose of the present invention is to provide a kind of multiple access broadband router of many wan interfaces, and this router can make definite outgoing interface correspondence an available route.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method of determining interface, this method may further comprise the steps:
When the multiple access broadband router of A, many wide area networks wan interface is received message, transmit the described message of receiving, and corresponding all wan interfaces are set up the NAT list item of described message respective session respectively to its all wan interfaces;
B, receive with described message under during the corresponding response message of session, the NAT list item of other the wan interface correspondences of deletion except that the wan interface of receiving response message is in order to determine receiving that the wan interface of described response message is the outgoing interface of the follow-up use of described session.
Preferably, in the steps A, carried out before all wan interfaces are transmitted the operation of described message, further comprise:
Judge that whether the described message of receiving is first message of its respective session, when described message is first message of its respective session, then carries out described operation of transmitting this message to all wan interfaces.
Preferably, in the steps A, whether the message that described judgement is received is that the step of first message of its respective session comprises:
A1, obtain the described five-tuple of receiving message;
A2, mate the network address translation NAT table in the multiple access broadband router of many wan interfaces according to the five-tuple of described acquisition, judge whether to exist the NAT list item of coupling, when not having the NAT list item of coupling, the then current message of receiving is first message of its respective session.
Preferably, among the step B, receive with described message under after the corresponding response message of session, and before the wan interface of determining to receive described response message is the outgoing interface of the follow-up use of described session, further comprise:
Judge whether described response message is first response message of its respective session, when being first response message of described session, the continuation execution is described determines to receive that the wan interface of described response message is the operation of the outgoing interface of the follow-up use of described session.
Preferably, in the steps A, when all wan interfaces were transmitted the described message of receiving, further comprise: the session at described message correspondence was provided with not complement mark of route;
Describedly judge that whether described response message is that the step of first response message of its respective session is: judge whether described session is provided with not complement mark of route, when being provided with route not during complement mark, the then current response message of receiving is first response message of its respective session;
, further comprise for behind first response message of its respective session at definite current response message of receiving: the route of deleting described session correspondence is complement mark not.
Preferably, in the steps A, receive message after, and, further comprise before described all wan interfaces are transmitted the message of receiving:
Judge whether matched static routing table of the described message of receiving, when described message does not match static routing table, continue to carry out the operation that all wan interfaces of described multiple access broadband router to many wan interfaces are transmitted the message of receiving.
In addition, the present invention also provides a kind of multiple access broadband router of many wan interfaces, comprises a plurality of local area network (LAN) LAN interface and a plurality of wan interface at least, further comprises: the interface determining unit;
Described interface determining unit, be connected with each LAN interface and wan interface, be used for when receiving message, transmit the described message of receiving, and corresponding all wan interfaces are set up the NAT list item of described message respective session respectively to all wan interfaces of the multiple access broadband router of many wan interfaces; And receive with described message under during the corresponding response message of session, the NAT list item of other the wan interface correspondences of deletion except that the wan interface of receiving response message is in order to determine receiving that the wan interface of described response message is the outgoing interface of the follow-up use of described session.
Preferably, described interface determining unit comprises: send processing unit, receive processing unit and memory cell;
Described memory cell is used to store the NAT table;
Described transmission processing unit is used for the NAT table according to the described message coupling memory cell of receiving, then determines first message that the described message of receiving is described session when not matching, and transmits the described message of receiving to each wan interface; And in described memory cell, set up the NAT list item of current sessions at each wan interface, not complement mark of route is set;
Described reception processing unit is used for determining that according to the NAT table of described memory cell the response message of receiving is the response message of described session; Judge whether described session is provided with not complement mark of route,, delete not complement mark of described route, and deletion is except that the described wan interface of receiving response message, the NAT list item of other wan interface correspondences when being provided with described route not during complement mark.
Preferably, this multiple access broadband router further comprises: the static routing matching unit;
Described static routing matching unit is used for connecting interface determining unit and all LAN interface; Message matched static routing table according to receiving from LAN interface when not matching described static routing table, is sent to the interface determining unit with described message.
A kind of method of determining interface provided by the present invention by when receiving message, is transmitted the message of receiving to all wan interfaces of the multiple access broadband router of many wan interfaces; And receive with message under during the corresponding response message of session, determine to receive that the wan interface of this response message is the outgoing interface of the follow-up use of current sessions.Owing to be response message, determine the wan interface that this session is used, so the route of this wan interface correspondence must be an available route in the present invention according to the session correspondence.And then the message that sends by this wan interface must guarantee carrying out smoothly of session, has ensured user's QoS.
Description of drawings
Fig. 1 is the structure chart of many WAN of prior art broadband router;
Fig. 2 is the exemplary process diagram of the inventive method;
Fig. 3 is the exemplary block diagram of many WAN of the present invention broadband router;
Fig. 4 is the flow chart of preferred embodiment method of the present invention;
Fig. 5 is for determining a specific implementation flow chart of interface in the preferred embodiment of the present invention;
Fig. 6 is the structure chart of interface determining unit in the preferred embodiment of the present invention;
Fig. 7 is the structure chart of preferred embodiment of the present invention WAN more than a broadband router.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The core concept of technical solution of the present invention is, in many WAN broadband router, when LAN interface receives message, transmits the described message of receiving to all wan interfaces; When receiving the response message corresponding then, the outgoing interface of the wan interface of this response message as the follow-up use of this session will be received with this session.In technical scheme of the present invention, owing to be to determine the wan interface that this session is used according to the response message of session correspondence, so this route of receiving the wan interface correspondence of response message must be an available route, can guarantee carrying out smoothly of session.
The session correspondence of indication a connection status in the present invention, and this connection can be determined unique definite according to the five-tuple of IP message.This five-tuple is: source IP address, source port, purpose IP address, destination interface and agreement.Here the agreement of indication is a link layer protocol, as TCP/UDP etc.
Be illustrated in figure 2 as the exemplary process diagram of the inventive method.In step 201, when receiving message, transmit the described message of receiving to all wan interfaces of the multiple access broadband router of many wan interfaces.In step 202, receive with described message under during the corresponding response message of session, determine to receive that the wan interface of described response message is the outgoing interface of the follow-up use of described session.Here, the implication of described outgoing interface is: current sessions is used for carrying out the wan interface that passes through with external network by many WAN broadband router.In addition, as not particularly pointing out, the type of message of being mentioned is the IP message in this article.
Be illustrated in figure 3 as the exemplary block diagram of many WAN of the present invention broadband router.This many WAN broadband router comprises a plurality of LAN interface and a plurality of wan interface at least, also further comprises: interface determining unit 31.Wherein, interface determining unit 31 is connected with each LAN interface and wan interface, is used for when receiving message, transmits the described message of receiving to all wan interfaces of the multiple access broadband router of many wan interfaces; And receive with described message under during the corresponding response message of session, determine to receive that the wan interface of described response message is the outgoing interface of the follow-up use of described session.In addition, interface determining unit 31 can also further receive the message of external network, and be sent to corresponding LAN interface from wan interface.
In technical scheme of the present invention, preferably, can further include in the step 201: judge whether the message of receiving is first message of its respective session, when the message of receiving is first message of its session, just carry out the operation of transmitting this message to all wan interfaces.Accordingly, in step 202, can further include: judge whether first response message of current sessions, determine to receive that the wan interface of first response message of current sessions is the outgoing interface of the follow-up use of this session.Such processing mode not only can be set up an available route, prevent that the user from going up the disconnection in the network process, and because it is the operation that first response message at first message of session and session carries out, therefore can be with available route of the fastest speed.In addition, because the foundation of this route is at first response message, therefore has less time-delay by this route transmission message.Certainly, in technical scheme of the present invention, can also handle at any message that session sends; And handle at response message arbitrarily.
Below at above-mentioned preferred embodiment technical scheme of the present invention is described in detail.Referring to Fig. 4, Fig. 4 is the flow chart of preferred embodiment method of the present invention in detail.Specifically be described below:
In step 401, many WAN broadband router judges whether to have the NAT list item corresponding with this IP message according to the NAT table of self preserving, if then execution in step 404 after LAN interface is received the pairing IP message of user's current sessions; Otherwise, execution in step 402.
Judging whether in this step to have the NAT list item corresponding with the current IP of receiving message, is to judge according to the five-tuple of IP message.
Here, what write down in each NAT list item is corresponding relation between IP message five-tuple and the reference address, because the five-tuple of IP message can uniquely be determined its corresponding session, therefore when the current message of receiving does not match corresponding NAT list item, show that then current message is first message of session under it.And when matching corresponding NAT list item, show that then current message is non-first message of session under it for the current message of receiving.At this moment, owing to when first message of affiliated session, determined which wan interface, therefore only need send message according to the wan interface of the reference address correspondence that matches and get final product as outgoing interface.Wherein, because the reference address in the NAT list item is exactly the IP address and the port numbers of its corresponding wan interface, therefore matching the NAT list item has determined that with regard to being equivalent to the wan interface that E-Packets is an outgoing interface.
In step 402, the current IP message of receiving all wan interfaces from many WAN broadband router are sent.
In step 403, when many WAN broadband router is received at first response message of current sessions, will determine the outgoing interface of the follow-up use of current sessions according to the wan interface of receiving this response message.Finish current handling process.After this, the follow-up IP message of this session just can send from this wan interface by coupling NAT list item.
Here the response message of receiving from wan interface of indication is meant all types of messages of receiving from external network at a session, can be meant the request message that sends at the conversational response message or by external network etc.
In addition, the technical scheme of performing step 403 can be as shown in Figure 5 a flow process in the present invention.Follow-up will describing in detail to the described flow process of Fig. 5.
In step 404, according to the wan interface transmission message of the NAT list item correspondence that matches.
Flow process shown in Figure 4 can be to carry out under the IP message of receiving matches the situation of default route.For have many wan interfaces to inserting broadband router, when matching default route, also need further to determine to send the outgoing interface of this IP message, could determine next jumping of this message.
In preferred embodiment of the present invention, can also be after receiving the IP message, can also judge further before the coupling NAT table that the message received whether can the matched static routing table, if energy is then carried out associative operation according to the mode of static routing; Otherwise, match default route, carry out the operation of coupling NAT table among the present invention.
The above-mentioned static routing table of mentioning is the static routing of keeper's manual configuration, is used for specifying wan interface to send from one specific purpose address or destination network segment.Certainly, in technical scheme of the present invention, the network manager also can investigate the ISP network that the server of service place is provided, and then with the matched static routing table, the IP message of this server of visit is sent by the wan interface that connects this ISP network.
Referring to Fig. 5, Fig. 5 is for determining a kind of specific implementation of interface in the step 403.In order to realize flow process shown in Figure 5, need be in step 402, the IP message that is about to receive further set up the NAT list item at each wan interface in the NAT table, and pairing session is provided with not complement mark of route at the current IP message when all wan interfaces send.Wherein, the route of setting not complement mark can be to be provided with at each NAT list item.Fig. 5 detailed process is as follows:
In step 501, when many WAN broadband router when certain wan interface is received message, judge whether to mate the NAT table of many WAN broadband router, if coupling, then execution in step 502; Otherwise, execution in step 505.
In step 502, judge whether the current message respective session of receiving is provided with not complement mark of route, if then execution in step 503; Otherwise, execution in step 504.
In step 503, many WAN broadband router keeps the NAT list item of the wan interface of receiving current message, deletes the NAT list item at current message of other wan interfaces; And the deletion route is complement mark not, execution in step 504.
After many WAN broadband router has been deleted at the NAT list item of other wan interfaces at current message respective session, other wan interfaces will can not handled the message of receiving, just determine the outgoing interface of current sessions subsequent packet this moment.
In step 504, the result according to coupling NAT table is sent to corresponding LAN interface with the IP message of receiving.Finish current handling process.
In step 505, abandon the message of receiving.
In technical scheme of the present invention, aging mechanism can also be set further.Just when certain wan interface is not received the message that sends from the outside in a period of time, delete the NAT list item of this wan interface correspondence.The session of this NAT list item correspondence then need rebulid corresponding N AT list item again.
The structure of many WAN broadband router is identical substantially with the exemplary configurations of many WAN broadband router in the preferred embodiment of the present invention, and just the concrete formation of docking port determining unit 31 has been done further refinement.Referring to Fig. 6, Fig. 6 is the structure chart of interface determining unit 31 of the present invention, comprising: send processing unit 261, receive processing unit 362 and memory cell 363.In Fig. 6, be that example describes only with two LAN interface and two wan interfaces.
Wherein, memory cell 363 is mainly used in storage NAT table.
Send processing unit 361 and be mainly used in, when not matching, then determine first message that the current message of receiving is described session, transmit the message that this is received to each wan interface according to the NAT table in the message coupling memory cell of receiving 363; And in memory cell 363, set up the NAT list item of current sessions at each wan interface, not complement mark of route is set.
Reception processing unit 362 is mainly used in according to the table of the NAT in the memory cell 363 determines that the response message of receiving is the response message of current sessions; Judge whether session is provided with not complement mark of route, when being provided with route not during complement mark, deleting this route is complement mark, and deletion is except that the wan interface of receiving response message, the NAT list item of other wan interface correspondences.In addition, receive processing unit 362 and can also further will match the message of NAT list item, be sent to corresponding LAN interface.
In addition,, in many WAN access band router, can further include: static routing matching unit 72 in order to realize the function of static routing coupling in technical scheme of the present invention.Here, static routing matching unit 72 is mainly used in connecting interface determining unit 31 and all LAN interface; According to the message matched static routing table of receiving from LAN interface, when not matching, message is sent to transmission interface determining unit 31.Concrete structure as shown in Figure 7, wherein, the internal structure of interface determining unit 31 can adopt structure as shown in Figure 6.When interface determining unit 31 comprised transmission processing unit 361, reception processing unit 362 and memory cell 363, then static routing matching unit 72 herein linked to each other with transmission processing unit 361.
In technical scheme of the present invention, owing to determine the wan interface that this session is used according to the response message of session correspondence, so the route of this wan interface correspondence must be an available route.And then the message that sends by this wan interface must guarantee carrying out smoothly of session, thereby has ensured user's QoS.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, a kind of method of determining interface is characterized in that, this method may further comprise the steps:
When the multiple access broadband router of A, many wide area networks wan interface is received message, transmit the described message of receiving, and corresponding all wan interfaces are set up the NAT list item of described message respective session respectively to its all wan interfaces;
B, receive with described message under during the corresponding response message of session, the NAT list item of other the wan interface correspondences of deletion except that the wan interface of receiving response message is in order to determine receiving that the wan interface of described response message is the outgoing interface of the follow-up use of described session.
2, method according to claim 1 is characterized in that, in the steps A, carries out before all wan interfaces are transmitted the operation of described message, further comprises:
Judge that whether the described message of receiving is first message of its respective session, when described message is first message of its respective session, then carries out described operation of transmitting this message to all wan interfaces.
3, method according to claim 2 is characterized in that, in the steps A, whether the message that described judgement is received is that the step of first message of its respective session comprises:
A1, obtain the described five-tuple of receiving message;
A2, mate the network address translation NAT table in the multiple access broadband router of many wan interfaces according to the five-tuple of described acquisition, judge whether to exist the NAT list item of coupling, when not having the NAT list item of coupling, the then current message of receiving is first message of its respective session.
4, according to claim 1,2 or 3 described methods, it is characterized in that, among the step B, receive with described message under after the corresponding response message of session, and before the wan interface of determining to receive described response message is the outgoing interface of the follow-up use of described session, further comprise:
Judge whether described response message is first response message of its respective session, when being first response message of described session, the continuation execution is described determines to receive that the wan interface of described response message is the operation of the outgoing interface of the follow-up use of described session.
5, method according to claim 4 is characterized in that, in the steps A, when all wan interfaces were transmitted the described message of receiving, further comprise: the session at described message correspondence was provided with not complement mark of route;
Describedly judge that whether described response message is that the step of first response message of its respective session is: judge whether described session is provided with not complement mark of route, when being provided with route not during complement mark, the then current response message of receiving is first response message of its respective session;
, further comprise for behind first response message of its respective session at definite current response message of receiving: the route of deleting described session correspondence is complement mark not.
6, method according to claim 1 is characterized in that, in the steps A, receive message after, and, further comprise before described all wan interfaces are transmitted the message of receiving:
Judge whether matched static routing table of the described message of receiving, when described message does not match static routing table, continue to carry out the operation that all wan interfaces of described multiple access broadband router to many wan interfaces are transmitted the message of receiving.
7, a kind of multiple access broadband router of many wan interfaces comprises a plurality of local area network (LAN) LAN interface and a plurality of wan interface at least, it is characterized in that, further comprises: the interface determining unit;
Described interface determining unit, be connected with each LAN interface and wan interface, be used for when receiving message, transmit the described message of receiving, and corresponding all wan interfaces are set up the NAT list item of described message respective session respectively to all wan interfaces of the multiple access broadband router of many wan interfaces; And receive with described message under during the corresponding response message of session, the NAT list item of other the wan interface correspondences of deletion except that the wan interface of receiving response message is in order to determine receiving that the wan interface of described response message is the outgoing interface of the follow-up use of described session.
8, the multiple access broadband router of many wan interfaces according to claim 7 is characterized in that, described interface determining unit comprises: send processing unit, receive processing unit and memory cell;
Described memory cell is used to store the NAT table;
Described transmission processing unit is used for the NAT table according to the described message coupling memory cell of receiving, then determines first message that the described message of receiving is described session when not matching, and transmits the described message of receiving to each wan interface; And in described memory cell, set up the NAT list item of current sessions at each wan interface, not complement mark of route is set;
Described reception processing unit is used for determining that according to the NAT table of described memory cell the response message of receiving is the response message of described session; Judge whether described session is provided with not complement mark of route,, delete not complement mark of described route, and deletion is except that the described wan interface of receiving response message, the NAT list item of other wan interface correspondences when being provided with described route not during complement mark.
9, the multiple access broadband router of 7 described many wan interfaces as requested is characterized in that this multiple access broadband router further comprises: the static routing matching unit;
Described static routing matching unit is used for connecting interface determining unit and all LAN interface; Message matched static routing table according to receiving from LAN interface when not matching described static routing table, is sent to the interface determining unit with described message.
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| CNB2007100794307A CN100452746C (en) | 2007-03-12 | 2007-03-12 | Method for determining out interface and multi-switch-in wideband router |
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| CN101350772B (en) * | 2008-09-08 | 2011-11-23 | 成都飞鱼星科技开发有限公司 | Method for selecting line of router with multiple WAN interfaces, system and router |
| CN101594301B (en) * | 2009-06-23 | 2012-05-23 | 杭州华三通信技术有限公司 | Method and device for processing message |
| CN101895476B (en) * | 2010-07-30 | 2012-02-15 | 中国电信股份有限公司 | Method, system, network side device and terminal for multi-access mode concurrent transmission |
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| CN102104512A (en) * | 2011-01-07 | 2011-06-22 | 华为技术有限公司 | Method and equipment for determining interface information |
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| CN1809033A (en) * | 2006-02-16 | 2006-07-26 | 四川南山之桥微电子有限公司 | NAT hardware implementation method |
| CN1829197A (en) * | 2006-04-14 | 2006-09-06 | 迈普（四川）通信技术有限公司 | Method for dynamically selecting outlet pathway |
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| CN101022384A (en) | 2007-08-22 |
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