CN1949776A - 4 over 6 tunnel packing and depacking method for extending boundary gateway protocol - Google Patents
4 over 6 tunnel packing and depacking method for extending boundary gateway protocol Download PDFInfo
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- CN1949776A CN1949776A CN 200610114423 CN200610114423A CN1949776A CN 1949776 A CN1949776 A CN 1949776A CN 200610114423 CN200610114423 CN 200610114423 CN 200610114423 A CN200610114423 A CN 200610114423A CN 1949776 A CN1949776 A CN 1949776A
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Abstract
The invention belongs to IPv4 and IPv6 network interconnecting method, characterized in that building peer relation of I-BGP between 4 over 6 double-stack routers and transmitting routing reachable information of the respective IPv4 isolated networks connected with the routers between them by BGP-MP protocol and completing tunnel automatic configuration, where data plane processing includes IPv4 packet packing operation and IPv6 packet unpacking operation. Because of using automatic tunnel building mechanism, the routers needs to store a corresponding relation of IPv4 network address and IPv6 address, where the corresponding relation is stored in a packing list structure and updated by BGP-MP protocol, thus implementing automatic IPv4 over IPv6 configuration. And it is simple to configure, widely applicable and able to apply to interconnection of IPv4 and IPv6 networks in complex topological structure.
Description
Technical field
Encapsulation and de-encapsulation method in 4 over, 6 tunnels of use BGP-MP expansion belong to Internet technical field, relate in particular to the tunneling technique of the IPv4 and the IPv6 network interconnection.
Background technology
Because IPv4 address space wretched insufficiency, will be developed rapidly based on the Next Generation Internet of IPv6.Yet because the IPv4 the Internet has had considerable scale and application program widely, so the IPv4 network is inevitable in long-term existence from now on, forms and process that IPv6 network of future generation progressively merges.Along with the IPv6 backbone network is set up, need to introduce a kind of new technology the IPv6 backbone network of IPv4 terminal use by rapidly and efficiently coupled together to improve the service quality of network.In addition, progressively discarded along with the IPv4 network will produce the disconnected transition stage of IPv4 network, and the IPv6 network need be realized communication between the different IP v4 network based on this as the bridge of a plurality of IPv4 networks of connection in this stage.
The address structure of IPv6 and IPv4 network is completely different, and the interconnection technique of IPv6 and IPv4 network becomes an important difficult problem of internet development.Though occurred at present the interconnection technique of many IPv6 and IPv4 network, as RFC2893, RFC2529, RFC3056, RFC3053 and some IETF draft, yet that these technology concentrate on IPv6over IPv4 is technical.That is to say how to be connected to each other between the isolated IPv6 network by the IPv4 backbone network.Above-mentioned technology has defined under this network topology structure, how realizes mutual between the IPv4 network by being based upon tunnel on the IPv6.
Along with IPv6 networks development and IPv4 network progressively discarded from now on, IPv6 will become the core of the network interconnection, thereby situation about no longer being communicated with by the IPv4 agreement between the IPv4 network might occur.In addition, provide the situation of high speed high-quality transmitted in packets for the IPv6 network, adopting the transport communication based on the IPv6 backbone network between the IPv4 network also is a kind of possible high-quality transmission mode.Therefore, how be necessary to consider to realize mutual between the IPv4 network by the tunnel of setting up IPv4 over IPv6.Though the correlation technique (such as 6to4) of IPv4over IPv6 is arranged at present, and these technology have been used special IPv6 address, can't make automatic configuration to the variation of network, so range of application are restricted.
The present invention proposes a kind of automatic tunnel method for building up of on the IPv6 network, realizing the IPv4 network interconnection, be called for short 4over6.Concern by the peer that between the 4over6 dual-stacker router, sets up I-BGP, and the route of the IPv4 isolated network of connection can reach information to use the BGP-MP agreement to transmit separately mutually between the router, finishes the automatic configuration in tunnel.Wherein the processing of datum plane comprises the encapsulation operation of IPv4 grouping and the decapsulation operation that IPv6 is divided into groups.Owing to used the mechanism of setting up the tunnel automatically, router need be preserved the corresponding relation of the IPv4 network address and IPv6 address, and this corresponding relation leaves in the encapsulating sheet structure, and upgrades by the BGP-MP agreement.
Summary of the invention
The objective of the invention is to design the encapsulating sheet of the dual-stacker router required inquiry when encapsulated message in 4 over, 6 tunnels that use the BGP-MP expansion, comprise the algorithm of the data structure of encapsulating sheet and inquiry, maintenance.
Method proposed by the invention is characterised in that: encapsulation operation is carried out in grouping to IPv4, to IPv6 grouping carrying out decapsulation operation; The IPv6 destination address that uses during encapsulation obtains by the inquiry encapsulating sheet; Encapsulating sheet has stored the IPv4 network address (comprising prefix length) and IPv6 address corresponding relation; Encapsulating sheet provides the more interface of new record, can be used for deletion, interpolation and renewal operation to record; Encapsulating sheet provides the interface of query note, can inquire about the IPv4 network address that matches according to certain given IPv4 host address, thereby return corresponding IPv6 address as encapsulation operation, in inquiry, used and mated according to network prefix order from big to small; Encapsulating sheet has used the data structure of being convenient to quick, effective search network address.
This method contains following steps successively:
Step (1) is passed through the definite point-to-point relation based on Border Gateway Protocol of Border Gateway Protocol (BGP)-MP module of an expansion in each 4over6 dual-stacker router, each router all sends to remaining router to routing iinformation by the Border Gateway Protocol (BGP)-MP of expansion, the IPv4 network address and self virtual interface IPv6 address comprising the transmit leg router, recipient's router adds the item of IPv4 address correspondence in local routing table after receiving this BGP-MP message, and add the corresponding relation of the IPv4 network address and IPv6 virtual interface address in the BGP-MP message in encapsulating sheet;
In described encapsulating sheet, also should have with lower interface:
Upgrade record interface, be used for renewal and deletion action the record of recipient 4over6 encapsulating sheet;
The query note interface is used for according to the corresponding IPv4 network address of IPv4 host address inquiry encapsulating sheet of receiving, and corresponding IPv6 address is returned to local virtual interface, and grouping encapsulates to IPv4 so that this virtual interface uses this IPv6 address;
Step (2) is being received IPv4 grouping time when the 4over6 dual-stacker router, finishes following steps successively:
Step (2.1) is transmitted according to destination address inquiry this locality of this IPv4 grouping, gives local virtual interface with grouping and handles;
This virtual interface of step (2.2) calls the query interface of encapsulating sheet according to the IPv4 destination address;
After step (2.3) encapsulating sheet received query requests, from big little sequential search encapsulating sheet, up to the IPv4 network address of finding coupling, the IPv6 address with correspondence returned to virtual interface then according to prefix;
Step (2.4) virtual interface uses the IPv6 address that inquires, and grouping encapsulates to IPv4, forms the IPv6 tunnel packet;
Step (2.5) dual-stacker router sends by inquiring about packaged IPv6 grouping after local IPv6 transmits;
Step (3) is carried out following steps successively after the 4over6 dual-stacker router receives the IPv6 grouping:
Step (3.1) is judged this IPv6 grouping " next protocol number " whether the territory be the IPv4 type, if words then carry out following step:
Step (3.2) is removed the IPv6 head of this IPv6 grouping, the corresponding IPv4 grouping in the reduction load;
Step (3.3) router by search local IPv4 transmit will restore the IPv4 grouping send;
Step (4) receives BGP-MP message when the 4over6 dual-stacker router, when needing to upgrade the 4over6 routing iinformation, carries out following steps successively:
Step (4.1) is called the updating interface of encapsulating sheet, imports the IPv4 network address to be updated and IPv6 address into;
The item that step (4.2) sequential search in encapsulating sheet is identical with the IPv4 network address of importing into is if find then upgrade IPv6 address in this with the IPv6 address of importing into;
Step (4.3) is then inserted one if do not find in encapsulating sheet, the address of importing into is just used in its IPv4 network address and IPv6 address;
When step (5) is received the inaccessible BGP-MP message of route when the 4over6 router, need the routing iinformation in the deletion router and call the encapsulating sheet module and carry out following steps:
Step (5.1) is called the delete interface of encapsulating sheet, imports the IPv4 network address to be deleted into;
The item that step (5.2) sequential search IPv4 network address in encapsulating sheet is identical with the address of importing into is if find, then with this entry deletion.
In the 4over6 server that the present invention has been used in Tsing-Hua University at present and is developed, dispose 8 nodes throughout the country, realized the IPv4 network interworking on the IPv6 network.
Description of drawings
Fig. 1. encapsulating sheet data structure schematic diagram;
Fig. 2 .4over6 system topological schematic diagram;
Fig. 3 .4over6 system in package decapsulation flow chart.
Embodiment
In the 4over6 system, the most basic composition is two isolated IPv4 networks and an IPv6 backbone network, wherein couples together with a 4over6 router respectively between backbone network and two IPv4 networks.This connected mode can be represented with Fig. 2.
With topology shown in Figure 2 is example, from the angle of packet forward, when the grouping of the IPv4 in the network A is wanted to arrive network B, must need through the encapsulation of 4over6 router-A and the decapsulation process of 4over6 router B.Owing to depositing the corresponding relation of the IPv4 network address and IPv6 address in the encapsulating sheet, A can learn pairing pe router IPv6 address, its purpose IPv4 address (network B) (the IPv6 address of 4over6 router B) by searching encapsulating sheet when grouping encapsulates to IPv4, encapsulate with this address then to get final product.
From the angle of route control, set up the peer relation of BGP between the 4over6 router, each router all sends to remaining router by the message of MP-BGP expansion with routing iinformation.In the topology of Fig. 2, router B sends to router-A with the network address of network B and the virtual interface IPv6 address of router B self by MP-BGP message, A adds corresponding after receiving message in the routing table of this locality, simultaneously the corresponding relation of the virtual interface IPv6 address of the network address of adding network B and router B in encapsulating sheet; Simultaneously router-A also sends the address information of network A to B by MP-BGP, when both sides' routing table and encapsulating sheet all set up finish after, just can carry out normal 4over6 and communicate by letter (i.e. encapsulation-decapsulation) process.
Fig. 1 has described the design of encapsulating sheet data structure.As shown in the figure, the pointer that the Hash that whole encapsulating sheet uses a Zones array (size is 33) record to point to the IPv4 network address of varying prefix length shows, the IPv4 destination address of all that are write down in each hash table all has identical prefix length.In each of hash table, write down the IPv4 network address and corresponding next jumped two stack 4over6 router IPv6 virtual interface addresses.
Execution flow process to three operations (upgrade, delete and inquiry) interface that encapsulating sheet provided then is described below:
More the interface of new record is as follows:
void?ect_update(struct?in_addr?dst_addr，unsigned?int?dst_mask，struct?in6_addr?vif_addr)；
Parameter:
The purpose IPv4 network address that dst_addr will upgrade
The prefix length of this network address of dst_mask
The IPv6 virtual interface address return value of two stack 4over6 routers of this purpose network address correspondence of vif_addr:
Do not have
The concrete steps that encapsulating sheet upgrades operation are:
1. calculate the hash value of dst_addr
2. to the relevant position of the hash of mask correspondence table:
A) lock this position
B) if find the list item identical with dst_addr
I. upgrade this address thresholding (the IPv6 address of promptly rewriting this list item is vif_addr)
C) if do not find identical list item
I. dst_addr and vif_addr are added the correspondence position that hash shows
D) this position is unlocked
The interface of deletion record is as follows:
void?ect_delete(struct?in_addr?dst_addr，unsigned?int?dst_mask)；
Parameter:
Purpose IPv4 network or host address that dst_addr will delete
The mask-length of this network address of dst_mask (number of binary digit " 1 ")
Return value:
Do not have
Carry out flow process (the encapsulating sheet maintenance module receives the operation after the message):
1. calculate the hash value of dst_addr
2. to the relevant position of the hash of mask correspondence table:
A) lock this position
B) if find the list item identical with dst_addr
I. with list item deletion from the hash table
C) this position is unlocked
int?ect_query(struct?in_addr?dst_addr，struct?in6_addr*vif_addr)；
Parameter:
The purpose IPv4 address that dst_addr will inquire about
The vif_addr Query Result returns by this parameter (pointer)
Return value:
If functional query success (promptly having found corresponding IPv6 address) returns 0, otherwise returns-1.
Carry out flow process:
1. destination address dst_addr is calculated the hash value
2. for each the hash table among the zones, do following operation (according to mask-length order from big to small):
A) the corresponding position of hash value of this dst_addr in the locking hash table
B) in the chained list of this position, search the list item that destination address is dst_addr
C) releasing is to the locking of this position
D) if find return results
E), continue the next hash table of search if do not find
Claims (1)
1. the 4over6 tunnel encapsulation and the de-encapsulation method of extending boundary gateway protocol is characterized in that, this method once contains following steps:
Step (1) is passed through the definite point-to-point relation based on Border Gateway Protocol of Border Gateway Protocol (BGP)-MP module of an expansion in each 4over6 dual-stacker router, each router all sends to remaining router to routing iinformation by the Border Gateway Protocol (BGP)-MP of expansion, the IPv4 network address and self virtual interface IPv6 address comprising the transmit leg router, recipient's router adds the item of IPv4 address correspondence in local routing table after receiving this BGP-MP message, and add the corresponding relation of the IPv4 network address and IPv6 virtual interface address in the BGP-MP message in encapsulating sheet;
In described encapsulating sheet, also should have with lower interface:
Upgrade record interface, be used for renewal and deletion action the record of recipient 4over6 encapsulating sheet;
The query note interface is used for according to the corresponding IPv4 network address of IPv4 host address inquiry encapsulating sheet of receiving, and corresponding IPv6 address is returned to local virtual interface, and grouping encapsulates to IPv4 so that this virtual interface uses this IPv6 address;
Step (2) is being received IPv4 grouping time when the 4over6 dual-stacker router, finishes following steps successively:
Step (2.1) is transmitted according to destination address inquiry this locality of this IPv4 grouping, gives local virtual interface with grouping and handles;
This virtual interface of step (2.2) calls the query interface of encapsulating sheet according to the IPv4 destination address;
After step (2.3) encapsulating sheet received query requests, from big little sequential search encapsulating sheet, up to the IPv4 network address of finding coupling, the IPv6 address with correspondence returned to virtual interface then according to prefix;
Step (2.4) virtual interface uses the IPv6 address that inquires, and grouping encapsulates to IPv4, forms the IPv6 tunnel packet;
Step (2.5) dual-stacker router sends by inquiring about packaged IPv6 grouping after local IPv6 transmits;
Step (3) is carried out following steps successively after the 4over6 dual-stacker router receives the IPv6 grouping:
Step (3.1) is judged this IPv6 grouping " next protocol number " whether the territory be the IPv4 type, if words then carry out following step:
Step (3.2) is removed the IPv6 head of this IPv6 grouping, the corresponding IPv4 grouping in the reduction load;
Step (3.3) router by search local IPv4 transmit will restore the IPv4 grouping send;
Step (4) receives BGP-MP message when the 4over6 dual-stacker router, when needing to upgrade the 4over6 routing iinformation, carries out following steps successively:
Step (4.1) is called the updating interface of encapsulating sheet, imports the IPv4 network address to be updated and IPv6 address into;
The item that step (4.2) sequential search in encapsulating sheet is identical with the IPv4 network address of importing into is if find then upgrade IPv6 address in this with the IPv6 address of importing into;
Step (4.3) is then inserted one if do not find in encapsulating sheet, the address of importing into is just used in its IPv4 network address and IPv6 address;
When step (5) is received the inaccessible BGP-MP message of route when the 4over6 router, need the routing iinformation in the deletion router and call the encapsulating sheet module and carry out following steps:
Step (5.1) is called the delete interface of encapsulating sheet, imports the IPv4 network address to be deleted into;
The item that step (5.2) sequential search IPv4 network address in encapsulating sheet is identical with the address of importing into is if find, then with this entry deletion.
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| CNB2006101144231A CN100372347C (en) | 2006-11-10 | 2006-11-10 | 4 over 6 tunnel packing and depacking method for extending boundary gateway protocol |
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| CNB2006101144231A CN100372347C (en) | 2006-11-10 | 2006-11-10 | 4 over 6 tunnel packing and depacking method for extending boundary gateway protocol |
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| CN1949776A true CN1949776A (en) | 2007-04-18 |
| CN100372347C CN100372347C (en) | 2008-02-27 |
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| WO2010020107A1 (en) * | 2008-08-21 | 2010-02-25 | 中国移动通信集团公司 | Number automatic routing method, updating method, withdrawing method, router and device |
| WO2010034244A1 (en) * | 2008-09-28 | 2010-04-01 | 华为技术有限公司 | Route distributing and installing method and network node device |
| CN101155115B (en) * | 2007-07-26 | 2010-09-08 | 杭州华三通信技术有限公司 | Method and apparatus for implementing automatic tunnel |
| CN101175043B (en) * | 2007-11-21 | 2011-04-20 | 中兴通讯股份有限公司 | System and method for supporting IPv6 terminal access to IPv4 core net |
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| CN101715174B (en) * | 2008-10-08 | 2012-09-19 | 中国移动通信集团公司 | Multimedia message transmitting method and service center as well as WAP gateway and system |
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