CN102291305B - Method and device for implementing 6 to 4 relay routing, and message forwarding method - Google Patents
Method and device for implementing 6 to 4 relay routing, and message forwarding method Download PDFInfo
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- CN102291305B CN102291305B CN201110235303.8A CN201110235303A CN102291305B CN 102291305 B CN102291305 B CN 102291305B CN 201110235303 A CN201110235303 A CN 201110235303A CN 102291305 B CN102291305 B CN 102291305B
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- 238000005538 encapsulation Methods 0.000 claims description 4
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Abstract
The invention provides a method for implementing 6 to 4 relay routing, comprising the following steps of: establishing a 6 to 4 routing for forwarding an IPv(Internet Protocol version)6 message from a 6 to 4 relay router to a target IPv6 network; establishing a configuration tunnel, wherein a target IPv4 address of the configuration tunnel is an IPv4 address embedded in a 6 to 4 address of the 6 to 4 relay router, and the configuration tunnel is stored in a tunnel table of a switching chip; establishing a configuration tunnel routing, wherein the target address of the configuration tunnel routing is consistent with the target address of the 6 to 4 relay routing, and an output interface of the configuration tunnel routing points to the configuration tunnel; and issuing the configuration tunnel routing to a forwarding table of the switching chip. The invention further correspondingly provides a device for implementing the 6 to 4 relay routing, and a method for implementing message forwarding via the device. With the technical scheme of the invention, communication between a 6 to 4 network and an IPv6 network can be implemented by changing little of hardware of the existing routing switching devices, or without changing.
Description
Technical field
The present invention relates to IP network data communication field, particularly for the 6to4 transistroute actualizing technology of IPv4 network and IPv6 network interworking.
Background technology
At present, existing internet just experienced by the period of IPv4 to IPv6 transition.But existing majority of network facility, comprises the network equipment in the backbone network of operator, enterprise network and campus network, does not support IPv6 agreement, therefore, at this transition period, some technology are needed to run in existing IPv4 network to realize IPv6 equipment.IPv6 over IPv4 tunnel is one of technology meeting this demand.
The starting point in IPv6 over IPv4 tunnel definition tunnel and terminal, for connecting the IPv6 network of both sides, tunnel, and tunnel itself runs on IPv4 network.When IPv6 message arrives this tunnel, add IPv4 head in tunnel starting point to IPv6 message, be referred to as tunnel head; When the IPv6 message with tunnel head arrives termination point of a tunnel, remove tunnel head, like this, original IPv6 message just can at the IPv6 network repeating of termination point of a tunnel side.
IPv6 over IPv4 tunnel is generally divided into configured tunneling technique and automatic tunnel, and configured tunneling technique generally needs configured tunneling starting point IPv4 address and terminal IPv4 address, and the IPv4 address of automatic tunnel is embedded in the IPv6 address of message.
In the prior art, as shown in Figure 1,6to4 tunnel is exactly the point-to-multipoint automatic tunnel of a kind of IPv6 over IPv4, realizes network service by the border router between Source Site and object website (source computer in such as 6to4 network A and the object computer in 6to4 network B) sets up tunnel.6to4 tunnel, by comprising the IPv4 address of 6to4 endpoint of a tunnel in the IPv6 address prefix of Source Site, object website, establishes mapping relations between the IPv6 address of the IPv4 address of the 6to4 border router in these both sides, tunnel and Source Site, object website.Specifically, 6to4 tunnel adopts special 6to4 address, its form is " 2002:abcd:efgh: subnet number:: interface ID/64 ", wherein " 2002 " are fixing IPv6 address prefix, " abcd:efgh " represents the IPv4 address of the endpoint of a tunnel be embedded in IPv6 address, represents (as IPv4 address " 1.1.1.1 " can be expressed as " 0101:0101 ") with 16 systems.Part unique identification after " 2002:abcd:efgh " position of website in 6to4 network.Therefore, 6to4 address has 64 network prefixs, and wherein first 48 are determined by the IPv4 address on router, and user can not change, and latter 16 are defined by user oneself.
But 6to4 tunnel can only transmit the packet mailing to termination point of a tunnel, so multiple 6to4 network can only be communicated with, and in order to arrive other IPv6 networks (as 2001: :/16 networks) further, just need the support of 6to4 relay router.6to4 relay router connects IPv4 and IPv6 network (comprising non-6to4 network), therefore, in order to arrive other IPv6 networks by 6to4 relay router, the border router of 6to4 network needs configuring static route, such as 2001: :/162002:abcd:efgh::, this static routing is also referred to as 6to4 transistroute.In this 6to4 transistroute, destination is this IPv6 network of network prefix 2001: :/16, next hop address points to the 6to4 address 2002:abcd:efgh: of opposite end 6to4 relay router:, like this, all messages going to this IPv6 network all can be forwarded to 6to4 relay router, be forwarded in IPv6 network by this 6to4 relay router more afterwards, thus realize the intercommunication of 6to4 network (address prefix starts with 2002) and IPv6 network.But due to the restriction of exchange chip in existing boundary router, this exchange chip itself can not the 6to4 transistroute of Direct Recognition upper-layer configured, therefore cannot according to the 6to4 address of the opposite end 6to4 relay router pointed out in this 6to4 transistroute, it is correctly forwarded by the IPv6 message encapsulation tunnel head received and two layers of information header.
Summary of the invention
For solving the problem of 6to4 network utilisation IPv4 network and IPv6 net interconnecting, realize 6to4 transistroute, the present invention proposes a kind of method and apparatus and the message forwarding method that realize 6to4 transistroute, the defect of 6to4 transistroute cannot be supported with the exchange chip overcoming route exchange device in prior art.
Technical scheme provided by the invention is as follows:
Realize a method for 6to4 transistroute, comprising: create and be used for IPv6 message via the 6to4 transistroute of 6to4 relay router to object IPv6 forwarded; Create configured tunneling technique, the object IPv4 address of this configured tunneling technique is IPv4 address embedded in the 6to4 address of described 6to4 relay router, and this configured tunneling technique is stored in the tunnel table of exchange chip; Create configured tunneling technique route, the destination address of this configured tunneling technique route is consistent with the destination address of described 6to4 transistroute, and the outgoing interface of this configured tunneling technique route points to described configured tunneling technique; And by described configured tunneling technique route sending-down to the transmitting of exchange chip.
The present invention also provides a kind of route exchange device realizing 6to4 transistroute, for connecting IPv6 network and IPv4 network, comprise: for creating the device of 6to4 transistroute, this 6to4 transistroute be used for by IPv6 message via 6to4 relay router to object IPv6 forwarded; For creating the device of configured tunneling technique, the object IPv4 address of this configured tunneling technique is IPv4 address embedded in the 6to4 address of described 6to4 relay router, and this configured tunneling technique is stored in the tunnel table of the exchange chip of this route exchange device; And for creating the device of configured tunneling technique route, the destination address of this configured tunneling technique route is consistent with the destination address of described 6to4 transistroute, the outgoing interface of this configured tunneling technique route points to this configured tunneling technique, and this configured tunneling technique route is issued in transmitting of described exchange chip.
Especially, described in transmit in also comprise two layers of information of the down hop for the IPv6 message repeating with tunnel head, described in transmit as third layer switching table.
Especially, two layers of information of described down hop are obtained according to IPv4 address lookup IPv4 routing table embedded in the 6to4 address of 6to4 relay router.
Especially, two floor information of described down hop can comprise: the target MAC (Media Access Control) address of down hop, outbound port number and/or VLAN tag.
Especially, the object prefix of described 6to4 transistroute is described object IPv6 network of network prefix, and the next hop address of 6to4 transistroute is the 6to4 address of described 6to4 relay router.
The present invention also provides a kind of method utilizing described route exchange device to realize message repeating, comprise: receive IPv6 message, based on the destination address in this IPv6 message, search in the transmitting of described route exchange device, obtain the configured tunneling technique corresponding with the destination address in described IPv6 message; According to the source address of described configured tunneling technique and destination address to this IPv6 message encapsulation IPv4 tunnel head; According to the two layers of information of down hop arriving configured tunneling technique destination address the IPv6 message with IPv4 tunnel head encapsulated and then forward.
Utilize technical scheme of the present invention, allow IPv6 message to be dealt into 6to4 relay router through IPv4 network, and then arrive other IPv6 networks.The realization of 6to4 transistroute is divided into two parts by the present invention: create the configured tunneling technique arriving 6to4 relay router, and the configured tunneling technique route of correspondence.After receiving IPv6 message, coupling configured tunneling technique route, is encapsulated as channel message by IPv6 message and is forwarded to 6to4 relay router.This method effectively solves the defect that hardware cannot support 6to4 transistroute automatically, when carrying out little change to the hardware of existing route switching equipment or do not change, can realize the intercommunication of 6to4 network and IPv6 network.
Accompanying drawing explanation
According to embodiment and accompanying drawing, the present invention is described in detail below.
The schematic diagram of the 6to4 network interconnection is realized in prior art shown in Fig. 1;
Fig. 2 illustrates the flow chart realizing the method for 6to4 transistroute according to the embodiment of the present invention;
Fig. 3 illustrates the network application environment schematic diagram realizing the method and apparatus of 6to4 transistroute according to the embodiment of the present invention.
Embodiment
Being easier to make technological means of the present invention, each feature, technique effect understand, below in conjunction with specific embodiments and the drawings, setting forth the present invention further.
As shown in Figure 2, be the flow chart realizing the method for 6to4 transistroute according to the embodiment of the present invention, Fig. 3 illustrates the network application environment schematic diagram realizing the method and apparatus of 6to4 transistroute according to the embodiment of the present invention.
As shown in Figure 2, comprise the following steps according to the method realizing 6to4 transistroute of the embodiment of the present invention:
(1) create for IPv6 message via the 6to4 transistroute of 6to4 relay router to object IPv6 forwarded.IPv6 network of network prefix for the purpose of the object prefix of this 6to4 transistroute, and the next hop address of 6to4 transistroute is the 6to4 address of 6to4 relay router.Such as, as shown in Figure 3, IPv6 network of network prefix can be 2001: :/16, the 6to4 address of 6to4 relay router can be such as 2002:IPv4_Addr::, then this 6to4 transistroute can be such as 2001: :/162002:IPv4_Addr::, wherein IPv4_Addr is the IPv4 address of the port of 6to4 relay router and IPv4 Internet connection.
(2) create configured tunneling technique, the object IPv4 address of this configured tunneling technique is IPv4 address (such as above-mentioned IP v4_Addr) embedded in the 6to4 address of described 6to4 relay router, and this configured tunneling technique is stored in the tunnel table of exchange chip.The establishment of this configured tunneling technique can be triggered by the establishment of 6to4 transistroute.The IPv4 address, source of configured tunneling technique can be the IPv4 address of the port that 6to4 border router is connected with IPv4 network.
(3) create configured tunneling technique route, the destination address of this configured tunneling technique route is consistent with the destination address of described 6to4 transistroute, such as, also can be 2001: :/16, and the outgoing interface of this configured tunneling technique route points to described configured tunneling technique.
(4) by described configured tunneling technique route sending-down to the transmitting of exchange chip.Here, IPv4 address lookup IPv4 routing table that can be embedded according to 6to4 relay router 6to4 address, for configured tunneling technique route sending-down one is routed to the transmitting of exchange chip (such as L3 table, i.e. the 3rd layer of table), the outgoing interface of the route issued is configured tunneling technique, and two of down hop layers of information are consistent with the IPv4 route next jump of coupling with outbound port.
Utilize said method, when the port that 6to4 border router is connected with 6to4 network receives IPv6 message, the L3 table of inquiry exchange chip, coupling configured tunneling technique route, learn that outgoing interface is configured tunneling technique, and then inquiry tunnel table, for message adds IPv4 tunnel head, then add two layers of head according to two layers of information of down hop, and forward from outbound port.
According to another embodiment of the present invention, additionally provide a kind of route exchange device realizing 6to4 transistroute, for connecting IPv6 network and IPv4 network, change route exchange device to comprise: for creating the device of 6to4 transistroute, this 6to4 transistroute be used for by IPv6 message via 6to4 relay router to object IPv6 forwarded; For creating the device of configured tunneling technique, the object IPv4 address of this configured tunneling technique is IPv4 address embedded in the 6to4 address of described 6to4 relay router, and this configured tunneling technique is stored in the tunnel table of the exchange chip of this route exchange device; And for creating the device of configured tunneling technique route, the destination address of this configured tunneling technique route is consistent with the destination address of described 6to4 transistroute, the outgoing interface of this configured tunneling technique route points to this configured tunneling technique, and this configured tunneling technique route is issued in transmitting of described exchange chip.
In above 6to4 transistroute implementation method and equipment, described in transmit in also can comprise two layers of information of the down hop for the IPv6 message repeating with tunnel head, described in transmit as third layer switching table.Two layers of information of described down hop can obtain according to IPv4 address lookup IPv4 routing table embedded in the 6to4 address of 6to4 relay router.Two floor information of described down hop can comprise the target MAC (Media Access Control) address of down hop, outbound port number and/or VLAN tag.The object prefix of described 6to4 transistroute is described object IPv6 network of network prefix, and the next hop address of 6to4 transistroute is the 6to4 address of described 6to4 relay router.
The present invention also provides a kind of method utilizing described route exchange device to realize message repeating, comprise: receive IPv6 message, based on the destination address in this IPv6 message, search in the transmitting of described route exchange device, obtain the configured tunneling technique corresponding with the destination address in described IPv6 message; According to the source address of described configured tunneling technique and destination address to this IPv6 message encapsulation IPv4 tunnel head; According to the two layers of information of down hop arriving configured tunneling technique destination address the IPv6 message with IPv4 tunnel head encapsulated and then forward.
Certainly, the scheme realizing 6to4 transistroute in the present invention also can be combined with 6to4 tunnel, as shown in Figure 3, and configurable 6to4 tunnel, 6to4 tunnel route between 6to4 border router and 6to4 relay router.The IPv4 address, source in this 6to4 tunnel is the IPv4 address with the port of IPv4 Internet connection on 6to4 border router, and the object IPv4 address in 6to4 tunnel is the IPv4 address with the port of IPv4 Internet connection on 6to4 relay router; The object prefix of this 6to4 tunnel route is 2002:IPv4_Addr::/z, and outgoing interface is this 6to4 tunnel, and wherein z represents the length of the object prefix of this 6to4 tunnel route.So, for the IPv6 message going to opposite end 6to4 network from 6to4 network via 6to4 border router, via arrival opposite end, 6to4 tunnel 6to4 relay router, and then opposite end 6to4 network can be arrived; And for going to the IPv6 message of opposite end IPv6 network via 6to4 border router from 6to4 network, opposite end 6to4 relay router can be arrived via configured tunneling technique, and then be forwarded to opposite end IPv6 network.
Described by above embodiment, to invention has been detailed description, but foregoing is only to exemplary description of the present invention, and protection scope of the present invention is defined by the claims, and is not limited to foregoing.Those skilled in the art can carry out many amendments to the present invention in the case without departing from the scope of the present invention, and such as, those skilled in the art according to the application needs of reality, adopt, but these amendments also can fall within the scope of the present invention.
Claims (10)
1. realize a method for 6to4 transistroute, it is characterized in that comprising:
Create and be used for IPv6 message via the 6to4 transistroute of 6to4 relay router to object IPv6 forwarded;
Create configured tunneling technique, the object IPv4 address of this configured tunneling technique is IPv4 address embedded in the 6to4 address of described 6to4 relay router, and this configured tunneling technique is stored in the tunnel table of exchange chip;
Create configured tunneling technique route, the destination address of this configured tunneling technique route is consistent with the destination address of described 6to4 transistroute, and the outgoing interface of this configured tunneling technique route points to described configured tunneling technique; And
By in described configured tunneling technique route sending-down to the transmitting of exchange chip.
2. method according to claim 1, is characterized in that, described in transmit in also comprise two layers of information of the down hop for the IPv6 message repeating with tunnel head, described in transmit as third layer switching table.
3. method according to claim 2, is characterized in that, obtains two layers of information of described down hop according to IPv4 address lookup IPv4 routing table embedded in the 6to4 address of 6to4 relay router.
4. method according to claim 3, is characterized in that, two floor information of described down hop comprise: the target MAC (Media Access Control) address of down hop, outbound port number and/or VLAN tag.
5. the method according to any one of claim 1-4, is characterized in that, the object prefix of described 6to4 transistroute is described object IPv6 network of network prefix, and the next hop address of 6to4 transistroute is the 6to4 address of described 6to4 relay router.
6. realizing a route exchange device for 6to4 transistroute, for connecting IPv6 network and IPv4 network, comprising:
For creating the device of 6to4 transistroute, this 6to4 transistroute be used for by IPv6 message via 6to4 relay router to object IPv6 forwarded;
For creating the device of configured tunneling technique, the object IPv4 address of this configured tunneling technique is IPv4 address embedded in the 6to4 address of described 6to4 relay router, and this configured tunneling technique is stored in the tunnel table of the exchange chip of this route exchange device; And
For creating the device of configured tunneling technique route, the destination address of this configured tunneling technique route is consistent with the destination address of described 6to4 transistroute, the outgoing interface of this configured tunneling technique route points to this configured tunneling technique, and this configured tunneling technique route is issued in transmitting of described exchange chip.
7. equipment according to claim 6, is characterized in that, described in transmit in also comprise two layers of information of the down hop for the IPv6 message repeating with tunnel head, described in transmit as third layer switching table.
8. equipment according to claim 7, is characterized in that, obtains two layers of information of described down hop according to IPv4 address lookup IPv4 routing table embedded in the 6to4 address of 6to4 relay router.
9. the equipment according to any one of claim 6-8, is characterized in that, the object prefix of described 6to4 transistroute is described object IPv6 network of network prefix, and the next hop address of 6to4 transistroute is the 6to4 address of described 6to4 relay router.
10. utilize route exchange device as claimed in claim 6 to realize a method for message repeating, it is characterized in that, comprising:
Receive IPv6 message, based on the destination address in this IPv6 message, search in the transmitting of described route exchange device, obtain the configured tunneling technique corresponding with the destination address in described IPv6 message;
According to the source address of described configured tunneling technique and destination address to this IPv6 message encapsulation IPv4 tunnel head;
According to the two layers of information of down hop arriving configured tunneling technique destination address the IPv6 message with IPv4 tunnel head encapsulated and then forward.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102394817B (en) * | 2011-10-28 | 2014-08-27 | 北京星网锐捷网络技术有限公司 | Tunnel forwarding method, device and network equipment |
| CN102438051A (en) * | 2012-01-14 | 2012-05-02 | 神州数码网络(北京)有限公司 | Method and system for realizing DHCP relay by two-layer network switching equipment |
| CN102594937A (en) * | 2012-02-06 | 2012-07-18 | 神州数码网络(北京)有限公司 | Method and system for realizing DHCP (Dynamic Host Configuration Protocol) v6 relay agent through two-layer network exchange equipment |
| CN102594936A (en) * | 2012-02-06 | 2012-07-18 | 神州数码网络(北京)有限公司 | Method and system for realizing dynamic host configuration protocol for internet protocol version 6 (DHCPv6) relay through two-layer network switching equipment |
| CN103166846B (en) * | 2013-03-27 | 2016-11-09 | 杭州华三通信技术有限公司 | A kind of message forwarding method and equipment |
| CN109068338B (en) * | 2018-06-20 | 2022-02-15 | 深圳市动能无线传媒有限公司 | System and method for detecting and processing compatibility of three-address wireless distributed system |
| CN115150266B (en) * | 2022-06-29 | 2024-03-15 | 北京天融信网络安全技术有限公司 | Local area network interconnection configuration and data transmission method |
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