CN100563241C - The method that a kind of network transition inserts - Google Patents
The method that a kind of network transition inserts Download PDFInfo
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- CN100563241C CN100563241C CNB2003101008021A CN200310100802A CN100563241C CN 100563241 C CN100563241 C CN 100563241C CN B2003101008021 A CNB2003101008021 A CN B2003101008021A CN 200310100802 A CN200310100802 A CN 200310100802A CN 100563241 C CN100563241 C CN 100563241C
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Abstract
The method that a kind of network transition inserts, client host utilizes the shared link of IPv4 network directly to adopt IPV6 message and access server to carry out communication, and the IPV6 message is sent to access server; Access server is according to purpose IPv6 address choice tunnel, utilizes the IPV4 network to transmit after the IPV6 message is encapsulated; The opposite end tunnel server receives decapsulation behind the encapsulated message, and the IPV6 message after the decapsulation is sent to destination node.The invention solves the complex configurations problem between existing pair of stack main frame and access server, avoid two stack main frames directly to carry out complicated tunnel encapsulation/decapsulation operation, tunnel information is administered by access server, after changing, tunnel configuration needn't revise the configuration of all two stack main frames, provide cost savings, reduced configuration and modification amount, made things convenient for the deployment of IPV6 two stack main frames.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the method that a kind of Internet protocol sixth version (IPV6) network transition inserts.
Background technology
IPv6 (Internet protocol sixth version) is in the development perfecting process, it will replace the Ipv4 (Internet protocol the 4th edition) that is widely used at present in Internet, IPv6 not with the IPv4 compatibility, and at present IPv4 has been widely used, so will be a long-term process from IPv4 to the IPv6 transition.From the initial stage of IPv4 to the IPv6 transition, the network node of supporting IPv6 can't carry out communication with IPv6 each other just as the isolated island in the ocean.Use tunneling technique, the node of IPv6 can utilize the message based on the network delivery IPv6 of IPv4, thereby carries out communication.
Be illustrated in figure 1 as IPV6 packet tunnel encapsulation form schematic diagram, tunneling technique is generally by transmitting in the network that message is encapsulated in again another type, by decapsulation reduction message, in the continuous transmission of the network trunk of original type, up to the destination, adopt the tunneling technique key point to be how to determine the address at two ends, tunnel.Tunneling mechanism provides the existing IPv4 network architecture of a kind of utilization to realize the IPv6 method for communicating, and basic methods is as follows:
1, tunnel portal carries out the IPv4 encapsulation earlier to the IPv6 packet, sends then.
2, after tunnel exit is received the packet of tunnel encapsulation, confirm whether need reorganization earlier, if packet through segmentation, needs reorganization so; Otherwise needn't.Remove tunnel encapsulation (IPV4 header) then, the packet of receiving is handled accordingly.
3, in order to make packet pass through the tunnel smoothly, tunnel portal may need to safeguard the soft state information in tunnel, such as record tunnel MTU parameters such as (MTUs).The employed tunnel of network node may be a lot, and relevant soft state can be buffered etc. and just to abandon no the time.
Except add the data packet head of IPv4 for the packet of IPv6, the encapsulation node also needs:
1, decision ICMP (Internet Control Message Protocol) error message that whether needs to split packet and whether need to send " packet is long " to the source end;
2, the error message that how router on the tunnel path is returned to the IPv4 of source end is mapped to the ICMP message of IPv6.
As shown in Figures 2 and 3, two stack main frames of existing customer's end generally are to keep tunnel information, oneself encapsulation and decapsulation is carried out communication by ethernet link and router (NAS) or BAS Broadband Access Server (BAS), utilizes the service that IPV4 access to netwoks far-end IP V6 network provides that has now.When two stack main frames and router or access server communication, on two stack main frames, encapsulate and decapsulation, adopt the IPV4 structure mutually nested, be equivalent to carry again on the IPv4 protocol stack IPv6 protocol stack with the IPV6 protocol stack.
The limitation of tunneling technique is to determine that a lot of situations in address of tunnel two-end-point are to realize that by configuration bother very much for the terminal use, workload is big, efficient is low, and makes mistakes easily.Also finding in the operation process, all is that cost is huge to any complex configurations of terminal use.
Tunnel agent (TB) provides a kind of method of simplifying configured tunneling technique, can reduce heavy tunnel configuration work.The thought of tunnel agent is exactly by providing special-purpose server as tunnel agent, automatically the tunneled requests sent of leading subscriber.The user can set up the tunnel with IPv6ISP easily by TB and be connected, thus the outside available IPv6 resource of visit.This transit mechanism of tunnel agent realizes quickly and easily that for the more IPv6 user of early stage attraction at IPv6 IPv6 is connected with very big benefit, also provides a kind of very simple and direct access way for early stage IPv6 provider simultaneously.
As shown in Figure 4, the model of TB mechanism is based on the several functional units among the figure, and in order to be connected to TB, the client dual stack node should at first provide corresponding proof of identification, in order to prevent illegal use, the safety measure of pre-configured or automatic configuration must be arranged between client and the TB.Therefore TB also can be regarded as the access control server that IPv4 is connected to IPv6 user, in case client's access request obtains allowing, the client need provide following at least information:
1, the IPv4 address of tunnel client end;
2, client registers is to the domain name of DNS (name server) use;
3, the function of client (for example, main frame or router).
If 4 clients are IPv6 routers, and to provide connection for a plurality of IPv6 main frames, client must provide the number that needs the IPv6 address, thereby makes tunnel agent can distribute required address prefix, rather than only distributes a single IPv6 address.
TB receives and does following operation after the request of client:
1, specify the endpoint of a tunnel of a TS (tunnel server) as network side:
2, select the IPv6 prefix assignment to give the user, the length of prefix can be between the 0-128;
3, set the life cycle in tunnel;
4, on DNS, register the global IPv 6 address of distributing to endpoint of a tunnel automatically;
5, the server end of configured tunneling technique;
6, the configuration information of notifying the client to be correlated with comprises the parameter and the DNS domain name in tunnel.
After above-mentioned configuration step was carried out, the tunnel of the IPv4 encapsulation IPv6 between client and the TS was just set up well and has been started working, and TB user just can visit the IPv6 network on 6Bone (test bed) or any TS of being connected in.
Encapsulate owing to carrying out message in the existing transitional technology at the two stack main frames of client, adopt two stack main frames of different transitional technologies to need special client, as: ISATAP (automatic addressing agreement in standing) client, tunnel agent client, Teredo client, DSTM (two stacks are changed the mechanism) client, corresponding software is installed for client's main frame, realize complexity, the deployment expense is big; And the potential route list of ISATAP, acting server etc. all need dispose on two stack main frames, and network topology must be reflected in the configuration information, thereby configuration is complicated; After tunnel configuration changes, must revise the configuration of all two stack main frames, not only workload is big, and suitable trouble.Though the tunnel agent technology has been simplified configuration, need provide special server as tunnel agent, increased lower deployment cost.
Summary of the invention
Technical problem to be solved by this invention is: overcome two stack main frames that client need be special in the existing transit mechanism, and shortcomings such as configuration complexity, lower deployment cost height, the method that provides a kind of IPV6 transition to insert, simplify the configuration of two stack main frames, thereby simplify requirement, make things convenient for the deployment of IPV6 client.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
The method that this network transition inserts may further comprise the steps:
A0, client host send neighbor request message to access server, whether search purposes IP address has the tunnel route to utilize, if have, then access server is set up transition and is transmitted item, and return neighbours' announcement message to main frame, tell that two stack main frames can be directly with the communication of IPv6 message wherein, the corresponding relation of Xiang Weiyuan IPv6 address, purpose IPv6 address and tunnel information is transmitted in described transition;
A, client host utilize the shared link of the 4th edition (IPv4) network of Internet protocol directly to adopt Internet protocol sixth version (IPv6) message and access server to carry out communication, and the IPv6 message is sent to access server;
B, access server carry out utilizing the IPv4 network to transmit after the tunnel encapsulation to described IPv6 message according to purpose IPv6 address;
C, opposite end tunnel server 0511164EP receive decapsulation behind the encapsulated message, and the IPv6 message after the decapsulation is sent to destination node.
Access server carries out decapsulation to the IPv4 encapsulated message that receives from far-end, and the IPv6 address according to after the decapsulation is transmitted to respective host by the IPv4 network link.
Described main frame is IPv6 main frame or two stack main frame, directly adopts IPv6 message and access server communication.
Among the described step B, access server carries out tunnel encapsulation to message according to the corresponding relation of IPv6 address, source, purpose IPv6 address and tunnel information, and hands over the IPv4 network to transmit encapsulated message.
Utilize the shared ethernet link to send between described access server and the two stack main frame or receive IPv4 or IPv6 message, when two stack main frames will be with the communication of IPv4 node, directly utilize the IPv4 protocol stack of access server; When two stack main frames will be with the communication of IPv6 node, utilize the IPv6 protocol stack.
Described access server is router NAS) or BAS Broadband Access Server (BAS.
Beneficial effect of the present invention is: the invention provides the method for a kind of client host by IPv4 network insertion IPv6 network, simplified the configuration of client, main frame does not need to know any tunnel information, and pure IPv6 main frame also can directly insert, and not necessarily needs two stack main frames.Protocol stack when utilizing the present invention to simplify the two stack main frame of customer end adopted, avoided on the protocol stack embedding protocol stack problem again, two stack main frames needn't be known endpoint of a tunnel, needn't carry out tunnel encapsulation, and encapsulation and packaged type move on on router or the BAS Broadband Access Server to be realized.
The invention solves the complex configurations problem between existing pair of stack main frame and access server, avoided client directly to carry out complicated tunnel encapsulation/decapsulation operation, after changing, tunnel configuration needn't revise the configuration of all client hosts, tunnel information is administered by access server, to client is fully transparent, and the modification of tunnel configuration does not influence the deployment of client host, provides cost savings like this, reduced configuration and modification amount, made things convenient for the deployment of IPV6 client host.
Description of drawings
Fig. 1 is an IPV6 packet tunnel encapsulation form schematic diagram;
Fig. 2 is two stack main frames of conventional transition pattern and access server Principle of Communication schematic diagram;
Fig. 3 is a conventional transition network topology structure schematic diagram;
Fig. 4 is a tunnel agent implementation structure schematic diagram;
Fig. 5 is two stack main frames of the present invention and access server Principle of Communication schematic diagram;
Fig. 6 is a transition network connection diagram of the present invention;
Fig. 7 is a transition network topology structure schematic diagram of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The present invention simplifies the relation between two stack main frames and router (NAS) or BAS Broadband Access Server (BAS), tunnel encapsulation/the decapsulation of complexity is moved on in router (NAS) or the BAS Broadband Access Server (BAS), reduce lower deployment cost, realize that two stack main frames insert IPv4 and IPv6 fully, truly.The present invention cancels the tunneling technique between router and the two stack main frames of client, and the tunneling technique between the reserved route device carries out the encapsulation and the decapsulation in tunnel by router.Realize the tunnel by configuration or other automated manners between router,, can carry out complex configurations because the configuration of router is by professional's management.Like this, complex configurations and requirement have been simplified to two stack main frames.
As shown in Figure 5, basic principle of the present invention is to carry out IPv4 and IPv6 communication by ethernet link is parallel between two stack main frames and router or BAS Broadband Access Server, original transition tunnel encapsulation process moved on on router or the BAS Broadband Access Server carry out, thereby reach the purpose of simplifying two stack main frames, reduce lower deployment cost.Two stack main frames can be regarded the logic PC of two platform independent as, and one can be moved IPv4, and one can be moved IPv6, and two protocol stacks are independent fully, and IPv4 protocol stack and IPv6 protocol stack walk abreast, and just two stack main frames no longer are protocol stack relations nested against one another.Two stack main frames can utilize ethernet link to send/receive IPv4 and IPv6 message simultaneously.When two stack main frames will be with the communication of IPv4 node, directly adopt the IPv4 protocol stack, if in the time of will be with the communication of IPv6 node, also directly utilize the protocol stack of IPv6 to carry out communication, which kind of do not need to be concerned about by tunnel, after access server receives the IP message, judge and send IPV4 or IPV6 protocol stack to handle, after encapsulating by the transition forwarding module for the IPV6 message, carry out communication by IPV4 network and far-end IP V6 node.The change of tunneling technique or redeploy the communication that all can not influence main frame on the access server.
In order to cooperate agreement parallel, router or access server need be made corresponding change, and which kind of transitional technology decision adopts encapsulate/transmit according to tunnel configuration information exactly.Access server adopts the transition forwarding module, and the IPv4 interface that possesses the IPv6 address is simultaneously carried out unified management, utilizes neighbours to find that the two stack main frames of message discovery will carry out the attempt of IPv6 communication.
The interface of access server also possesses parallel ability of carrying out IPv4 and IPv6 communication, and this interface of registration in the transition forwarding module, the interface of transition forwarding module management possesses the tunnel and sets up ability, and transition forwarding module and tunnel server carry out setting up, safeguard associated tunnel alternately.Access server does not have the IPv6 routing iinformation, has only the transition forwarding module to grasp tunnel information, carries out encapsulation/decapsulation.
As shown in Figure 6 and Figure 7, when neighbor request arrives access servo interface, at first whether (mainly be obtain tunnel opposite end IPv4 address in search purposes IP address if having the tunnel route to utilize, because access server can corresponding a plurality of tunnel servers), then set up transition forwarding project if having, the form of transition forwarding item is as follows:
| IPv6 address, source | Purpose IPv6 | Tunnel information |
| 2002::1 | 2003::1 | Tunnel ID |
Access server returns neighbours declaration (RA) to main frame then, tells two stack main frames can directly use the communication of IPv6 message, after the IPv6 message of two stack main frames arrives, transmits according to transition and to send after item information encapsulates.
Two stack main frames directly adopt IPv6 and access server communication, when carrying out communication:
1, two stack main frames send neighbor request to access server, and whether search purposes IP address has the tunnel route to utilize;
2, if there is the tunnel route to utilize, then access server is set up transition and is transmitted item, promptly sets up the corresponding relation of IPv6 address, source, purpose IPV6 address and tunnel information;
3, two stack main frames send the IPV6 message, and access server is transmitted item to message according to transition and carried out tunnel encapsulation, and hands over the IPv4 network to transmit encapsulated message;
4, after the opposite end tunnel server receives encapsulated message, carry out decapsulation, the IPV6 message is sent to destination node.
Hand to the transition forwarding module for the IPv4 encapsulated message (protocol number is 41) that access server receives, be transmitted to two stack main frames according to the IPv6 address after the decapsulation of transition forwarding module.
Client also can not adopt two stack main frames, and directly is pure IPV6 main frame, directly adopts IPV6 message and access server communication, utilizes the communication of realization of IPV4 network and far-end IP V6 node then.
The present invention utilizes ethernet link or other shared links to carry out IPv4 and IPv6 communication simultaneously, realize the transition forwarding module on the router, intercept and capture IPv6 neighbor request information, transmit project according to the transition of neighbor request information architecture, carry out tunnel encapsulation and decapsulation according to transition forwarding project, realize crossing over the purpose that the IPv4 network carries out the IPv6 communication.
Utilize the technology (interface all can independently be realized IPv4 and IPv6) of IPv4/IPv6 parallel communication of the present invention, two stack main frames do not need to know any tunnel transition information, the encapsulation and the decapsulation in tunnel are directly finished by access server, the information of opposite end, tunnel server also is transparent to two stack main frames, be responsible for setting up, safeguarding tunnel information by access server, the modification of tunnel information does not influence main frame.Provide cost savings like this, reduced configuration and modification amount, made things convenient for the deployment of IPV6 two stack main frames.
Claims (6)
1, a kind of method of network transition access is characterized in that, may further comprise the steps:
A0, client host send neighbor request message to access server, whether search purposes IP address has the tunnel route to utilize, if have, then access server is set up transition and is transmitted item, and return neighbours' announcement message to main frame, tell two stack main frames can directly use the communication of IPv6 message, the corresponding relation of Xiang Weiyuan IPv6 address, purpose IPv6 address and tunnel information is transmitted in wherein said transition;
A, client host utilize the shared link of the 4th edition IPv4 network of Internet protocol directly to adopt Internet protocol sixth version IPv6 message and access server to carry out communication, and the IPv6 message is sent to access server;
B, access server are transmitted item according to transition, and described IPv6 message is carried out utilizing the IPv4 network to transmit after the tunnel encapsulation;
C, opposite end tunnel server receive decapsulation behind the encapsulated message, and the IPv6 message after the decapsulation is sent to destination node.
2, the method for network transition access according to claim 1, it is characterized in that: described access server comprises the transition forwarding module, this transition forwarding module carries out unified management to the IPv4 interface that possesses the IPv6 address;
Access server is handed to the transition forwarding module to the IPv4 encapsulated message that receives from far-end and is carried out decapsulation, and the IPv6 address according to after the decapsulation is transmitted to respective host by the IPv4 network link.
3, the method for network transition access according to claim 1 and 2, it is characterized in that: described main frame is IPV6 main frame or two stack main frame, directly adopts IPV6 message and access server communication.
4, the method for network transition access according to claim 3, it is characterized in that: among the described step B, access server carries out tunnel encapsulation to message according to the corresponding relation of IPv6 address, source, purpose IPv6 address and tunnel information, and hands over the IPv4 network to transmit encapsulated message.
5, the method for network transition access according to claim 3, it is characterized in that: utilize the shared ethernet link to send between described access server and the two stack main frame or receive IPv4 or IPv6 message, when two stack main frames will be with the communication of IPv4 node, directly utilize the IPv4 protocol stack of access server; When two stack main frames will be with the communication of IPv6 node, utilize the IPv6 protocol stack.
6, the method for network transition access according to claim 3, it is characterized in that: described access server is router NAS or BAS Broadband Access Server BAS.
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| CNB2003101008021A CN100563241C (en) | 2003-10-01 | 2003-10-01 | The method that a kind of network transition inserts |
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| CNB2003101008021A CN100563241C (en) | 2003-10-01 | 2003-10-01 | The method that a kind of network transition inserts |
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| CN100563241C true CN100563241C (en) | 2009-11-25 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100466599C (en) * | 2005-07-22 | 2009-03-04 | 上海贝尔阿尔卡特股份有限公司 | Safety access method for special local area net and device used for said method |
| CN101692647B (en) * | 2009-10-12 | 2012-03-14 | 清华大学 | Tunnel forwarding system in which IPv4 packets are encapsulated by IPv6 head in router |
| CN102694752B (en) * | 2011-03-21 | 2015-03-11 | 国基电子（上海）有限公司 | Gateway equipment |
| CN102740384A (en) * | 2011-04-06 | 2012-10-17 | 中兴通讯股份有限公司 | Tunnel information reporting method and system thereof |
| CN102377671B (en) * | 2011-11-02 | 2014-10-29 | 中国联合网络通信集团有限公司 | Load balancing method and system and broadband remote access server equipment |
| CN104954161A (en) * | 2014-03-28 | 2015-09-30 | 中兴通讯股份有限公司 | IPv6 transitional technology type processing method, device and system |
| CN111327507A (en) * | 2018-12-17 | 2020-06-23 | 上海擎感智能科技有限公司 | APN link load balancing realization method and system |
| CN112019433B (en) * | 2019-05-29 | 2022-01-14 | 华为技术有限公司 | Message forwarding method and device |
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2003
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| IPv4的ARP与IPv6的邻居发现协议之比较. 殷苌茗等.长沙电力学院学报，第16卷第1期. 2001 |
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