CN102572790A - Distributed mobile IPV6 (Internet Protocol Version 6) method based on AR (Access Router) level - Google Patents
Distributed mobile IPV6 (Internet Protocol Version 6) method based on AR (Access Router) level Download PDFInfo
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Abstract
The invention provides a distributed mobile IPV6 (Internet Protocol Version 6) method based on an AR (Access Router) level. The purpose of the invention is realized as follows: functions of an AR are expanded, so that the AR has a function of an HA (Home Agent) in a mobile IPV6, and the AR is called as HAR (Home Access Router); After being connected with one HAR1, an MN (Mobile Node) can obtain one IPV6 address (HoA1) according to a normal IPV6 mechanism; if the MN starts communication with a CN (Communication Node) through the HAR1, the HoA1 not only serves as the home address but also serves as a COA (Care Of Address); under a router optimized mode, the CN needs to maintain the binding of the HoA1 and the HoA1; if the MN is switched to another HAR2, the MN can obtain one IPV6 address HoA2 according to the normal IPV6 mechanism, and at the moment, the HoA1 continues to serve as the home address, and the HoA2 serves as the COA; and therefore, the MN firstly needs to establish a binding of the HoA1 and the HoA2 in the HAR1, then carries out RRP (Resource Reservation Protocol) authentication and changes the binding established in the CN into the binding of the HoA1 and the HoA2.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of method of the distributed mobile IP v 6 based on the couple in router aspect.
Background technology
1973, U.S. Department of Defense developed the IPv4 prototype based on ICP/IP protocol.Through three modifications and perfect, the standard criterion file (RFC791) of IPv4 was proposed formally in September, 1981 the Internet engineering duty group (IETF) afterwards.1981, the appearance of PC indicated the beginning in Internet epoch.The development of Internet is based on the agreement of IPv4, does not have the Internet of today without IPv4.
Along with the expansion of development of internet technology and network size, IETF worries that the IPv4 address is not enough, at the formal standard criterion file (RFC2460) that proposes IPv6 of in December, 1998.IPv6 can provide huge address space as the alternate version of IPv4, and has the not available new features of many IPv4, thereby has received increasing attention.On February 3rd, 2011, the IPv4 address distributed, and the U.S., Europe, Japan, Korea S and China are all actively disposing IPv6 at present.
On the other hand, Along with people's is to the increase day by day of mobile communication demand, and the research of mobile communication has also been reached unprecedented height.The message area of develop rapidly in the world today, Internet and mobile communication are two noticeable industries.At any time, any place, people hope to obtain Internet service, so just produced technology-mobile IP (MIP) that Internet is combined with mobile communication, as shown in Figure 1.MIP technology just mobile node (being commonly referred to as computer or router etc.) realizes crossing over the roaming function of different segment with fixed IP addresses or IP address prefix, and guarantees that the network legal power of network IP can not change in roam procedure.The MIP technology solves in the global mobility problem on the IP layer, also need solve problems such as fail safe, reliability.
MIP is one of Internet main application of carrying, and wherein the MIP that carried of IPv4 network is called MIPv4, and the MIP that the IPv6 network is carried is called MIPv6.IETF has released mobile communication standard RFC3344 and the mobile communication standard RFC3775 under the IPv6 environment under the IPv4 environment respectively at 2002,2006.Mobile node among the MIPv6 (MN), communication node (CN), home agent (HA), couple in router notions such as (AR) have been defined among the RFC3775.
In MIPv6 (being RFC3775), home address (HoA) is as the unique identification of upper-layer protocol perception MN, and irrelevant with the Network Access Point of its current access.When MN moves to field network, can obtain a new address, i.e. Care-of Address (CoA).Mapping relations between CoA and the HoA are referred to as " binding ".Mobile node is notified the CoA of MN to the HA that is positioned at home network through the binding registration process.
In MIPv6, when MN moved to field network, the communication mode of MN and CN had two kinds.A kind of is the mode of non-routing optimality; MN has registered the CoA of oneself to HA; HA intercepts and captures the data message that is dealt into the home address of issuing MN on the home link, and HA searches the CoA that the Binding Update clauses and subclauses find MN again, issues the registered CoA of MN with the mode in tunnel then.A kind of in addition is the communication mode of routing optimality, promptly allows MN directly to communicate with CN, need not the forwarding through HA, raises the efficiency.Because MN and CN are direct communications, therefore, when the CoA of MN changed, MN not only will also will send binding update messages to CN to HA, notified them to change the binding of HoA and CoA.Before sending binding update messages, to carry out the RRP authentication between MN and the CN to CN.
In recent years, IETF has carried out the research of MIPv6 autgmentability on both direction on the basis of MIPv6: centralized MIPv6 and distributed MIPv6.Proxy mobile IPv 6 (Proxy Mobile IPv6, PMIPv6, RFC5213), fast moving IPv6 (Fast Mobile IPv6; FMIPv6, RFC5568), based on agency fast moving IPv6 (Proxy Fast Mobile IPv6, PFMIPv6; RFC5949), the mobile IP v 6 of layering (Hierarchical Mobile IPv6, HMIPv6, RFC5380), based on mobile IP v 6 (the Dual-Stack Mobile IPv6 of two stacks; DSMIPv6, RFC5555) grade all belongs to centralized MIPv6.
The research of distributed MIPv6 is started late, and IETF does not announce relevant RFC as yet at present.The present invention proposes a kind of new distributed MIPv6 method based on the AR aspect, and this method guarantees in the moving process of MN, to realize distributed mobile management.
Summary of the invention
The objective of the invention is to propose a kind of method of the distributed mobile IP v 6 based on the AR aspect.The objective of the invention is to realize like this:
1、HAR
The present invention is integrated into AR to HA, and such AR is called HAR.HAR is the main entity of distributed mobile IP v 6.A network can have a plurality of HAR, MN is born the task of access and mobile management.HAR distributes a unique and routable IPv6 address for each MN that inserts.So-called unique, be meant that addresses distributed all is different for each MN that inserts same HAR.But the what is called route is meant with these addresses to be that the data message of destination address all can be routed to HAR, delivers to each MN through link layer then.
2, the switching of MN
All HAR send ICMP advertising of route message termly.MN can also can judge the own current HAR that whether switches to other through the network prefix of ICMP advertising of route message IP header through the existence territory in the ICMP advertising of route message.
If MN finds oneself to switch to another HAR, then need be to this HAR registration.This HAR can distribute a new address to MN.
3, mobile management
If MN inserts HAR1, then MN can use normal IPv6 mechanism to generate an IPv6 address HoA1.If MN initiates communication through HAR1 to CN1, then HoA1 bears the effect of home address and Care-of Address.
If MN switches to HAR2 from HAR1, then MN equally also can use normal IPv6 mechanism to generate an IPv6 address HoA2.For with the communicating by letter of CN1, HoA1 still is a home address, but no longer is Care-of Address.HoA2 bears the effect of Care-of Address.
If MN initiates communication through HAR2 to CN2, then HoA2 bears the effect of home address and Care-of Address.That is to say that HoA2 is Care-of Address, but concerning the communication of new initiation, then is home address, also is Care-of Address concerning the communication before switching.
The structure chart based on the distributed MIPv6 method of AR aspect that the present invention proposes is as shown in Figure 2.
4, the communication of the pattern of non-routing optimality and renewal
When MN inserted HAR1, MN can obtain an address HoA1 according to normal IPv6 mechanism.If MN initiates communication through HAR1 to CN1, then HoA1 is both as home address, also as Care-of Address.MN mails to the data message of CN1, and destination address is the address of CN1, is CNA, and source address is HoA1.CN1 mails to the data message of MN, and destination address is HoA1, and source address is CNA.The communication process of MN and CN is as shown in Figure 3.
When MN when HAR1 switches to HAR2, MN also can obtain an address HoA2 according to the mechanism of normal IPv6.With respect to original communication, HoA1 is continuing to serve as home address, but no longer serves as Care-of Address.Care-of Address is served as by HoA2.For this reason, HAR1 need set up the binding of home address and the Care-of Address of MN, i.e. the binding of HoA1 and HoA2 so that with CN1 mail to the data message of MN correct be transmitted to MN.
MN sends BU message to HAR1.The destination address of BU message is the address of HAR1, and source address is HoA2, and HoA1 is filled out in the home address territory in the message, and HoA2 is filled out in the Care-of Address territory.After HAR1 receives BU message, set up the binding of HoA1 and HoA2, reply BA message to MN then.The destination address of BA message is HoA2, and source address is the HAR1 address.The form of BU message and BA message is observed the standard of MIPv6.
After MN received BA message, MN need encapsulate the data message that mails to CN1.Data message after the encapsulation, the destination address of outer header is the address of HAR1, and source address is HoA2, and the destination address of inner header is CNA, and source address is HoA1.Data message after the encapsulation at first is sent to HAR1.HAR1 carries out decapsulation to the data message of receiving.Data message after the decapsulation can be routed to CN1 according to destination address.
CN1 mails to the data message of MN, and destination address remains HoA1.Such data message mails to HAR1.HAR1 receives behind the data message that CN1 sends and can search the HoA1 that oneself keeps and the binding of HoA2 according to HoA1 that mail to HAR2 to data message through the tunnel between HAR1 and the HAR2 then, HAR2 sends to data message to MN again.
If MN initiates communication through HAR2 to new CN (being CN2), home address and the Care-of Address that will communicate by letter with CN2 as MN of HoA2 then.
The flow chart of non-routing optimality pattern is as shown in Figure 4.
5, the communication of the pattern of routing optimality and renewal
When MN inserted HAR1, MN can use normal IPv6 mechanism to obtain an address HoA1.If MN initiates communication through HAR1 to CN1, then HoA1 is both as home address, also as Care-of Address.Under the pattern of routing optimality, according to the standard of MIPv6, CN1 need keep the binding of home address and the Care-of Address of MN, is exactly the binding of keeping HoA1 and HoA1 here.Simultaneously, the data message that MN sends to CN1, destination address is CNA, and source address is HoA1, and home address option extension head comprises HoA1, and the data message that CN1 sends to MN, destination address is HoA1, and source address is CNA, and second type of route head comprises HoA1.
When MN when HAR1 switches to HAR2, MN also can use normal IPv6 mechanism to obtain an address HoA2.With respect to original communication, HoA1 is continuing to serve as home address, but no longer serves as Care-of Address.Care-of Address is served as by HoA2.Under the pattern of routing optimality, according to the standard of MIPv6, HAR1 need set up the binding of home address and the Care-of Address of MN, is exactly the binding of HoA1 and HoA2 here, also will upgrade the address binding among the CN1 simultaneously.The flow chart of routing optimality pattern is as shown in Figure 5.Before the address binding in upgrading CN1, also must carry out the RRP authentication, concrete steps are following:
● MN sends BU message to HAR1, and the destination address of BU message is the address of HAR1, and source address is HoA2, and HoA1 is filled out in the home address territory in the message, and HoA2 is filled out in the Care-of Address territory.HAR1 receives the binding of setting up HoA1 and HoA2 after the BU message, replys BA message to MN then;
● after MN receives BA message, send HoTI message and CoTI message to CN1.The destination address of HoTI message is CNA, and source address is HoA1, and HoA1 is filled out in the home address territory in the message, and HoA2 is filled out in the Care-of Address territory.Then, MN encapsulates HoTI message, the HoTI message after the encapsulation, and destination address is the address of HAR1, source address is HoA2.HAR1 receives that carrying out decapsulation after the HoTI message after the encapsulation obtains HoTI message, then HoTI message goes CN1.The destination address of CoTI message is CNA, and source address is HoA2, and HoA1 is filled out in the home address territory in the message, and HoA2 is filled out in the Care-of Address territory.CoTI message directly mails to CN1 according to its destination address.
● CN1 replys HoT message and CoT message to MN after receiving HoTI message and CoTI message.The destination address of HoT message is HoA1, and source address is CNA.HoT message goes HAR1.HAR1 receives the binding of searching HoA1 and HoA2 according to HoA1 after the HoT message, then through the tunnel between HAR1 and the HAR2 HoT message goes MN.The destination address of CoT message is HoA2, and source address is CNA.CoT message directly mails to MN.
● after MN receives HoT message and CoT message, send BU message to CN1.The destination address of BU message is CNA, and source address is HoA2, and HoA1 is filled out in the home address territory in the message, and HoA2 is filled out in the Care-of Address territory.After CN1 received BU message, the address binding of keeping oneself changed to the binding of HoA1 and HoA2, and then, CN1 replys BA message to MN.
After address binding upgraded and accomplishes, CN1 mail to the data message of MN, and destination address is HoA2, and source address is CNA, and second type of route head comprises HoA1.MN mails to the data message of CN1, and destination address is CNA, and source address is HoA2, and home address option extension head comprises HoA1.
If MN initiates communication through HAR2 to CN2, then HoA2 is with as home address of communicating by letter with CN2 and Care-of Address.
Description of drawings
Fig. 1 is for moving the network structure of IP
Fig. 2 is the structure chart of the distributed MIPv6 method of AR aspect
Fig. 3 is the communication process of MN before switching and CN
Fig. 4 is the flow chart of non-routing optimality pattern
Fig. 5 is the flow chart of routing optimality pattern
Fig. 6 is the schematic network structure of embodiment
Embodiment
The solution that the purpose of this invention is to provide a kind of distributed mobile IP v 6 based on the AR layer.Through the problem that this method can reduce centralized mobile management effectively and brought, promptly optimize route, reduce propagation delay time.The basic thought of this prioritization scheme is: the function of expansion couple in router, make its function that has both home agent in the mobile IP v 6, and lower the burden of HA among the MIPv6.When MN switched, when promptly switching to HAR2 from HAR1, MN directly communicated by letter with CN1, and will pass through HAR2 in the way also only is to transmit datagram as router, need not pass through HAR1, has further reduced time-delay.
Below we MN to switch to HAR2 from HAR1 be instance, and combine accompanying drawing 6 to specify the embodiment of routing optimality of the present invention.
1, as shown in Figure 6, the address of HAR1 is aec0:0:0:1::1/64, and the address of HAR2 is aec0:0:0:2::1/64, and the CN1 address is cec0:0:0:1::1/64.Wherein, MN is connected on the link of HAR1, and this moment, the HoA1 of MN was aec0:0:0:1::2/64.
When 2, MN sent out datagram to CN1, datagram was at first passed through HAR1, and then is transmitted to CN1.The datagram source address is aec0:0:0:1::2/64, and destination address is cec0:0:0:1::1/64.HAR1 is keeping the binding of home address and the Care-of Address of MN, the just binding of HoA1 and HoA1.This moment, HoA1 was both as the home address of MN, again as its Care-of Address.
3, when MN moves to HAR2; HAR2 regularly sends ICMP and acts on behalf of broadcast on the network segment that it is responsible for; MN receives this message; Can judge the position that oneself belongs to, mainly the network prefix of existence territory in this message or ICMP advertising of route message IP header judges whether oneself has moved.
4.MN, find oneself to have moved, and receive the broadcast of acting on behalf of of HAR2 through aforesaid operations.MN has obtained own new address according to normal IPv6 mechanism, and promptly HoA2 is aec0:0:0:2::2/64, and this address is equivalent to original communication, and HoA1 is as home address, but can not be as Care-of Address, and Care-of Address is served as by HoA2.
5, the communication of non-routing optimality pattern and renewal
After MN obtains HoA2, send BU message to HAR1, the destination address of BU message is aec0:0:0:1::1/64, and source address is aec0:0:0:2::2/64, and aec0:0:0:1::2/64 is filled out in the home address territory in the message, and aec0:0:0:2::2/64 is filled out in the Care-of Address territory.After HAR1 receives BU message, upgrade the binding of original MN home address and Care-of Address, set up the binding of HoA1 and the HoA2 of MN, reply BA message to MN afterwards, source address is aec0:0:0:1::1/64, and destination address is aec0:0:0:2::2/64.
MN will encapsulate to the CN1 literary composition that sends datagram.The outer field source address in encapsulation back is aec0:0:0:2::2/64, and destination address is aec0:0:0:1::1/64.The source address of internal layer is aec0:0:0:1::2/64, and destination address is cec0:0:0:1::1/64.After datagram arrived HAR1, the HAR1 decapsulation was given CN1 with datagram.
CN1 sends datagram literary composition to MN, and source address is cec0:0:0:1::1/64, and destination address is aec0:0:0:1::2/64.After HAR1 receives datagram, search the binding of home address and the Care-of Address of the MN that oneself keeps, through the tunnel that HAR1 and HAR2 have set up, give HAR2 datagram, HAR2 gives MN datagram again.
6, communication and renewal under the optimization pattern
After MN obtains HoA2, send BU message to HAR1, the destination address of BU message is aec0:0:0:1::1/64, and source address is aec0:0:0:2::2/64, and aec0:0:0:1::2/64 is filled out in the home address territory in the message, and aec0:0:0:2::2/64 is filled out in the Care-of Address territory.After HAR1 receives BU message, upgrade the binding of original MN home address and Care-of Address, set up the binding of HoA1 and the HoA2 of MN, reply BA message to MN afterwards, source address is aec0:0:0:1::1/64, and destination address is aec0:0:0:2::2/64.
MN receives and sends HoTI message and CoTI message to CN1 after the BA of HAR1 answer.The form of HoTI message and CoTI message is consistent with the form among the MIPv6.MN will encapsulate the message of the HoTI that sends, and outer source address is aec0:0:0:2::2/64, and destination address is aec0:0:0:1::1/64, and aec0:0:0:1::2/64 is inserted in the home address territory, and aec0:0:0:2::2/64 is inserted in the Care-of Address territory.The internal layer source address is aec0:0:0:1::2/64, and destination address is cec0:0:0:1::1/64.HAR1 receives after the datagram, and decapsulation is also given CN1 datagram.The source address of the message of CoTI is aec0:0:0:2::2/64, and destination address is cec 0:0:0:1::1/64, and aec0:0:0:1::2/64 is inserted in the home address territory, and aec0:0:0:2::2/64 is inserted in the Care-of Address territory.CoTI message is directly issued CN1.
CN1 receives HoTI message and CoTI message, can reply HoT message and CoT message afterwards.The source address of HoT is cec0:0:0:1::1/64, and destination address is aec0:0:0:1::2/64.After HoT message arrived HAR1, the tunnel of HAR1 through setting up with HAR2 issued HAR2 to datagram, and HAR2 issues MN to datagram again.The source address of CoT message is cec0:0:0:1::1/64, and destination address is aec0:0:0:2::2/64.
MN receives HoT and CoT message, can send BU message to CN1, and source address is aec0:0:0:2::2/64, and destination address is cec0:0:0:1::1/64, and aec0:0:0:1::2/64 is inserted in the home address territory, and aec0:0:0:2::2/64 is inserted in the Care-of Address territory.The forwarding of process HAR2 in the process of message route.After CN1 receives BU message, send BA message, the source address of message is cec0:0:0:1::1/64, and destination address is aec0:0:0:2::2/64.After said process was accomplished, the binding of having set up home address and the Care-of Address of MN among the CN1 was the binding of aec0:0:0:1::2/64 and aec0:0:0:2::2/64.
When MN sends datagram to CN1, can pass through the forwarding route of HAR2, and need not pass through HAR1, shorten the path.CN1 sends out datagram and gives MN, also need not pass through HAR1, has reduced delay.
Claims (4)
1. method based on the distributed mobile IP v 6 of couple in router aspect is characterized in that:
The function of A, expansion couple in router (AR) makes it have both the function of home agent in the mobile IP v 6 (HA), and couple in router is called HAR like this;
B, under the pattern of non-routing optimality, after mobile node switched to another HAR2 from a HAR1, mobile node can carry out through HAR1 according to the standard in the mobile IP v 6 with communicating by letter of communication node;
C, under the pattern of routing optimality, after mobile node switched to another HAR2 from a HAR1, mobile node can directly carry out according to the standard of mobile IP v 6 with communicating by letter of communication node.
2. the method for a kind of distributed mobile IP v 6 based on the couple in router aspect according to claim 1 is characterized in that said steps A specifically comprises:
A1, HAR are that mobile node provides access service, and the mobile node that inserts HAR all can obtain an IPv6 address;
A2, HAR are that mobile node provides the mobile management service, and concrete steps are following:
If the A21 mobile node inserts HAR1, then mobile node obtains an IPv6 address HoA1, if mobile node is initiated communication through HAR1 to communication node, then HoA1 bears the effect of home address and Care-of Address;
If the A22 mobile node switches to HAR2 from HAR1; Then mobile node equally also can obtain another IPv6 address HoA2, for the communicating by letter of original communication node, HoA1 still is a home address; But no longer be Care-of Address, HoA2 bears the effect of Care-of Address;
If the A23 mobile node is initiated communication through HAR2 to new communication node, then HoA2 bears the effect of home address and Care-of Address, that is to say; HoA2 is a Care-of Address concerning the communication before switching, but concerning the communication of new initiation; Then being home address, also is Care-of Address.
3. the method for a kind of distributed mobile IP v 6 based on the couple in router aspect according to claim 1 is characterized in that said step B specifically comprises:
B1, when mobile node inserts HAR1, mobile node obtains an IPv6 address HoA1, HoA1 is both as home address; Again as Care-of Address; Under the pattern of non-routing optimality, mobile node mails to the data message of communication node, and source address is HoA1; Communication node mails to the data message of mobile node, and destination address is HoA1;
B2, when mobile node when HAR1 switches to HAR2; Mobile node obtains another IPv6 address HoA2; HoA2 will be as Care-of Address, and HoA1 is just as home address, no longer as Care-of Address; For this reason, the mobile node binding that need in HAR1, set up HoA1 and HoA2 through BU/BA message in the mobile IP v 6;
After B3, the address binding in HAR1 were set up and accomplished, mobile node mail to the data message of communication node, and source address is HoA1; Then, mobile node will be to the encapsulation of data message, and the data message destination address after the encapsulation is HAR1; Source address is HoA2, and the data message after the encapsulation is routed to HAR1, and HAR1 carries out decapsulation to the data message after encapsulating; Data message after the decapsulation mails to communication node, and communication node mails to the data message of mobile node, and destination address is HoA1; After data message reached HAR1, HAR1 mail to mobile node to data message according to the binding of HoA1 and HoA2.
4. the method for a kind of distributed mobile IP v 6 based on the couple in router aspect according to claim 1 is characterized in that said step C specifically comprises:
C1, when mobile node inserts HAR1, mobile node obtains an IPv6 address HoA1, HoA1 is both as home address; As Care-of Address, under the pattern of routing optimality, communication node will be kept the binding of HoA1 and HoA1 again; Mobile node mails to the data message of communication node, and source address is HoA1, and home address option extension head comprises HoA1; Communication node mails to the data message of mobile node, and destination address is HoA1, and second type of route head comprises HoA1;
C2, when mobile node when HAR1 switches to HAR2, mobile node obtains another IPv6 address HoA2, HoA2 will be as Care-of Address; And HoA1 is just as home address; No longer as Care-of Address, for this reason, mobile node need be set up the binding of HoA1 and HoA2 and change to the address binding of communication node the binding of HoA1 and HoA2 through BU/BA message in HAR1; Before the address binding of change communication node, carry out the RRP authentication;
C3, the address binding of HAR1 set up and the address binding of communication node upgrade accomplish after; Mobile node mails to the data message of communication node; Source address is HoA2, and home address option extension head comprises HoA1, and communication node mails to the data message of mobile node; Destination address is HoA2, and second type of route head comprises HoA1.
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| WO2015131567A1 (en) * | 2014-09-24 | 2015-09-11 | 中兴通讯股份有限公司 | Ipv6 address management method, device and terminal |
| CN105978812A (en) * | 2016-05-06 | 2016-09-28 | 北京邮电大学 | Message forwarding method and device |
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| WO2015131567A1 (en) * | 2014-09-24 | 2015-09-11 | 中兴通讯股份有限公司 | Ipv6 address management method, device and terminal |
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Application publication date: 20120711 |