CN104092561B - 4over6 dynamic address distribution server failure backup method - Google Patents
4over6 dynamic address distribution server failure backup method Download PDFInfo
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Abstract
Disclosed is a 4over6 dynamic address distribution server failure backup method. First of all, a Lightweight 4over6 tunnel is established, a network tunnel comprises a DHCPv4-over-DHCPv6 server and a DHCPv4-over-DHCPv6 backup server which are connected in the same multicast domain and share the same IPv6 address pool and the same IPv4 address pool, and the DHCPv4-over-DHCPv6 backup server is configured with an extra IPv6 address pool and an extra IPv4 address pool; the DHCPv4-over-DHCPv6 backup server maintains at a salient state and does not respond to a DHCP message when it is determined that the DHCPv4-over-DHCPv6 server works normally; and when the DHCPv4-over-DHCPv6 server fails or the DHCPv4-over-DHCPv6 backup server cannot maintain connected with the DHCPv4-over-DHCPv6 server, the DHCPv4-over-DHCPv6 backup server is converted to a normal mode from a salient mode, and the DHCP message is processed, such that the network stability can be guaranteed.
Description
Technical field
The invention belongs to Internet technical field, particularly to a kind of 4over6 dynamic address allocation server failure redundant
Method.
Background technology
128 bit address that IPv6 address uses, that is, about 3.4 × 1038Individual address, it is approximately that IPv4 address provides
The 7.9 × 10 of amount28Again it may be said that IPv6 has virtually limitless address space.Furthermore, for other new techniques,
IPv6 is more ripe in the unique development in the whole world, is suitable for the technology of large scale deployment.Therefore, IPv6 technology becomes current solution ground
The optimum selection of location resource scarcity, it meets the growing address need of current internet.But, due to current IPv4 clothes
A large amount of presence of business, IPv4 address is in short supply simultaneously, in order to ensure still can persistently to make to the period IPv4 service of IPv6 transition
With operator tends to distribute same IPv4 address, a part of end of this IPv4 address of each CU for multiple users
Mouthful.
The newly-built network of operator is more likely to use IPv6 at present, there is IPv4 user and cross over the visit of IPv6 network in network
Ask the demand of IPv4Internet.Lightweight4over6 transitional technology is the same IPv4 ground of multiple IPv4 user's distribution
Location, each user uses different segment ports.IPv4 user can carry out phase with cross-domain IPv6 network with IPv4Internet simultaneously
Mutual communication.This technology disposes 4over6 tunnel convergent point TC ((Tunnel in IPv6 access network and IPv4 the Internet intersection
Concentrator), and in IPv4 network and IPv6 access network intersection dispose 4over6 tunnel initiate point TI (Tunnel
Initiator), the IPv4-over-IPv6 by setting up between 4over6 tunnel initiate point TI and 4over6 tunnel convergent point TC
Tunnel, realizes IPv4 message and transmits in IPv6 network.The main process of 4over6 tunneling technique is as follows：4over6 tunnel is initiated
Point TI passes through dynamic host configuration protocol DHCP v6 agreement or static configuration obtains IPv6 address and DHCPv4-over-DHCPv6
The IPv6 address of server, then utilizes DHCPv4-over-DHCPv6 technology and DHCPv4-over-DHCPv6 server application
IPv4 address, the IPv4 address of distribution is added segment port and 4over6 tunnel initiate point TI by DHCPv4-over-DHCPv6 server
IPv6 address be sent to 4over6 tunnel convergent point TC, 4over6 tunnel convergent point TC is by the IPv4 of 4over6 tunnel initiate point TI
Address adds segment port and mapping is set up in IPv6 address；4over6 tunnel convergent point TC safeguards the IPv4 of 4over6 tunnel initiate point TI
Address adds the mapping between segment port and IPv6 address.Between so 4over6 tunnel convergent point TC and 4over6 tunnel initiate point TI
Tunnel have built up and complete.The IPv4 message of any 4over6 tunnel initiate point TI and the IPv4 of 4over6 tunnel convergent point TC
Message, all will be forwarded by IPv4-over-IPv6 tunnel, it is achieved thereby that IPv4 message crosses over the biography of IPv6 network
Defeated.
At present in the middle of technology, DHCPv4-over-DHCPv6 server is the shared IPv4 of 4over6 tunnel initiate point TI configuration
The IPv4 address of 4over6 tunnel initiate point TI is added segment port simultaneously and IPv6 address information is sent to 4over6 tunnel and converges by address
Accumulation TC.DHCPv4-over-DHCPv6 server maintenance tunnel lease information.In current technology, if DHCPv4-
Over-DHCPv6 server runs into fault, and the 4over6 tunnel in the network of server place, after lease expires, needs experience to release
Put current IPv4, IPv6 address, again the process of application IPv6 address and IPv4 address.User needs to experience and offline reaches the standard grade again
Process, network linking is not sufficiently stable, and user satisfaction declines.
Content of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of 4over6 dynamic address allocation
Server failure backup method, by disposing DHCPv4-over-DHCPv6 redundant server so that DHCPv4-over-
During DHCPv6 server fail, still user equipment can be serviced it is ensured that network stabilization.
To achieve these goals, the technical solution used in the present invention is：
A kind of 4over6 dynamic address allocation server failure backup method, initially sets up Lightweight4over6 tunnel
Road, tunneled network includes DHCPv4-over-DHCPv6 server, DHCPv4-over-DHCPv6 redundant server, 4over6
Tunnel initiate point TI and 4over6 tunnel convergent point TC, wherein DHCPv4-over-DHCPv6 server and DHCPv4-over-
DHCPv6 redundant server configures interconnect in same multicast domain, and share with a piece of IPv6 address pool and IPv4 address
Pond, and configure an extra IPv6 address pool and IPv4 address pool on DHCPv4-over-DHCPv6 redundant server, use
In the new lease information of DHCPv4-over-DHCPv6 server failure post processing；DHCPv4-over-DHCPv6 redundant server
Keep silent status when determining DHCPv4-over-DHCPv6 server normal work, dhcp message is not responded；When
DHCPv4-over-DHCPv6 server failure or DHCPv4-over-DHCPv6 redundant server cannot and DHCPv4-
When over-DHCPv6 server keeps connecting, DHCPv4-over-DHCPv6 redundant server switchs to normal mode from silent mode
Formula, is processed to dhcp message.
The process of setting up in described Lightweight4over6 tunnel is：
By DHCPv6 server disposition in DHCPv4-over-DHCPv6 server, with 4over6 tunnel initiate point TI it is
Customer access equipment, is attached with some IPv4 subscriber's main stations downwards, converges with 4over6 tunnel upwardly through IPv6 network
Point TC connect, tunnel configuration generate before, the IPv6 address of described 4over6 tunnel initiate point TI to DHCPv6 server application,
While issuing IPv6 address for it, in DHCPv6 message, carrying package contains DHCPv4-over-DHCPv6 to DHCPv6 server
The option of server ip v6 address；Described 4over6 tunnel initiate point TI upstream Interface behind configuration of IP v6 address, to
DHCPv4-over-DHCPv6 server application IPv4 address；The configured IPv6 of described 4over6 tunnel convergent point TC downstream interface
Address, upstream Interface configured IPv4 address；DHCPv4-over-DHCPv6 server receives 4over6 tunnel initiate point TI
After IPv4 address request, issue IPv4 address and segment port for it, simultaneously by the IPv6 ground of 4over6 tunnel initiate point TI
Location and the IPv4 address that issues and port segment information send to 4over6 tunnel convergent point TC, 4over6 tunnel convergent point TC according to
The information configuration mapping table receiving.
Described DHCPv4-over-DHCPv6 server includes DHCPv6 server, is responsible for 4over6 tunnel initiate point TI
Issue IPv6 address and IPv4 address and segment port, IPv4 address lease and IPv6 address lease time are consistent.
Described DHCPv4-over-DHCPv6 redundant server was led to DHCPv4-over-DHCPv6 server every 10 seconds
Letter is to confirm whether it is online.
During described DHCPv4-over-DHCPv6 server normal work, 4over6 tunnel initiate point TI exceeded in the rental period
Send DHCP new information when 50%, the current rental period is renewed a contract；When receive IP address lease request, re-rent and discharge please
When seeking message, carry out first issuing address to 4over6 tunnel initiate point TI, renew the lease and deleting lease operation, Ran Houxiang
DHCPv4-over-DHCPv6 redundant server send new information, if IP address releasing request message, then need to
4over6 tunnel convergent point TC sends message, deletes the corresponding map entry of 4over6 tunnel convergent point TC；If IP address is
IPv4 address, then send IPv4-UPDATE message；If IPv6 address, then send IPv6-UPDATE message；DHCPv4-
Over-DHCPv6 redundant server updates the lease storehouse of oneself according to the new information receiving, and keeps and DHCPv4-over-
DHCPv6 server lease information is consistent.
Under described DHCPv4-over-DHCPv6 redundant server normal mode：
When there being user equipment to re-rent, 4over6 tunnel initiate point TI sends the RENEW of unicast when the rental period is more than 50%
Message, if DHCPv4-over-DHCPv6 server is no responded, user equipment sends multicast when the rental period is more than 87.5%
The REBIND message of type, now DHCPv4-over-DHCPv6 redundant server receive REBIND message, responded, to this place
Location is re-rented；
When there being new user equipment to need access network, DHCPv4-over-DHCPv6 redundant server uses described extra
IPv6 address pool and IPv4 address pool be the new user device configuration tunnel accessing, enable user equipment to use network.
When DHCPv4-over-DHCPv6 server recovers to restart from malfunction, to DHCPv4-over-
DHCPv6 redundant server sends RECOVER message, and DHCPv4-over-DHCPv6 redundant server receives RECOVER message,
Set up TCP with DHCPv4-over-DHCPv6 server to be connected, one by one to DHCPv4-over-DHCPv6 server transport lease
Information, after all of lease information transfer is finished, DHCPv4-over-DHCPv6 redundant server is changed into from normal mode
Silent mode.
Physical cord between DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 redundant server
After road is unimpeded, DHCPv4-over-DHCPv6 server sends new information to DHCPv4-over-DHCPv6 redundant server,
Mutually send out lease synchronizing information, the side receiving lease synchronizing information searches local lease information, if locally not having this simultaneously
Lease information, then by this lease information insert lease information bank, if lease information bank has this lease, check local this
Whether bar lease information is up-to-date；If up-to-date, then keep lease storehouse constant, if it is not, then using the rent receiving
About information is updated to lease information bank；After the local lease information of oneself is sent by both sides to other side, both sides rent
About information bank is consistent, and now DHCPv4-over-DHCPv6 redundant server is changed into silent mode from normal mode.
Described lease synchronization message is IPv4-SYN or IPv6-SYN.
Compared with prior art, application claims DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6
Redundant server disposition is in a piece of network, and needs to determine whether other side is online within a certain period of time.It is right that this technology does not need
User equipment is modified, and between DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 redundant server
Communication mechanism simple, DHCPv4-over-DHCPv6 redundant server only has two states：Silent status and normal condition.
When DHCPv4-over-DHCPv6 server fail, the service of user equipment can seamlessly switch to DHCPv4-over-
On DHCPv6 redundant server, and DHCPv4-over-DHCPv6 redundant server is in the event of DHCPv4-over-DHCPv6 server
Still the user equipment newly reached the standard grade can be serviced during barrier, have good autgmentability.It can be avoided that because network failure or
Person's DHCPv4-over-DHCPv6 server failure leads to the user offline in network, prevents DNS frequent switching, improves user full
Meaning degree.
Brief description
Fig. 1 is the network structure of DHCPv4-over-DHCPv6 server failure redundant of the present invention.
Fig. 2 is address of the present invention lease update method flow chart.
Fig. 3 is DHCPv4-over-DHCPv6 redundant server after DHCPv4-over-DHCPv6 server of the present invention recovers
Patten transformation flow chart.
Fig. 4 is DHCPv4-over-DHCPv6 server of the present invention and DHCPv4-over-DHCPv6 redundant server lease
Information synchronization method flow chart.
Specific embodiment
Describe embodiments of the present invention with reference to the accompanying drawings and examples in detail.
The present invention proposes a kind of 4over6 dynamic address allocation server failure backup method, and basic thought is,
DHCPv4-over-DHCPv6 server keeps the lease with DHCPv4-over-DHCPv6 redundant server under normal circumstances
Information is consistent, and redundant server keeps silent status.When redundant server finds the connection failure and master server between,
Redundant server is changed into normal mode, and supports to provide, to master server, the function of recovering lease information.
For realizing the method, first have to set up Lightweight4over6 tunnel.As shown in figure 1, the inventive method is related to
Network include 4over6 tunnel convergent point TC, DHCPv4-over-DHCPv6 server, DHCPv6 server and 4over6 tunnel
Road initiate point TI.In order to mechanism more safety is easy, in the present invention, DHCPv6 server disposition is in DHCPv4-over-
In DHCPv6 server, 4over6 tunnel initiate point TI, as customer access equipment, is carried out with numerous IPv4 subscriber's main stations downwards
Connect, be connected with 4over6 tunnel convergent point TC upwardly through IPv6 network.Before tunnel configuration generates, 4over6 tunnel initiate point
The IPv6 address of TI is issuing IPv6 address to DHCPv6 server application, DHCPv6 server for 4over6 tunnel initiate point TI
While, the option of carrying package server ip containing DHCPv4-over-DHCPv6 v6 address in DHCPv6 message.4over6
Tunnel initiate point TI upstream Interface behind configuration of IP v6 address, to DHCPv4-over-DHCPv6 server application IPv4 address.
The configured IPv6 address of 4over6 tunnel convergent point TC downstream interface, upstream Interface configured IPv4 address.DHCPv4-over-
After DHCPv6 server receives the IPv4 address request of 4over6 tunnel initiate point, strategically issue IPv4 address for it
And segment port, the IPv4 address simultaneously by the IPv6 address of 4over6 tunnel initiate point TI and issuing and the transmission of port segment information
To 4over6 tunnel convergent point TC, 4over6 tunnel convergent point TC is according to the information configuration mapping table receiving.Now
Lightweight4over6 tunnel building completes.During afterwards, DHCPv4-over-DHCPv6 server maintenance
The IPv4 lease information of 4over6 tunnel initiate point.
Based on above-mentioned network, in the present invention, DHCPv4-over-DHCPv6 server can process normal DHCPv6 and disappear
Breath is it is also possible to process DHCPv4-over-DHCPv6 message.DHCPv4-over-DHCPv6 server and DHCPv4-over-
DHCPv6 redundant server disposition interconnects in a piece of IPv6 network, and configures same multicast address domain.The present invention
In, IPv4 address lease and IPv6 address lease time are consistent.4over6 tunnel initiate point TI is first from DHCPv4-over-
DHCPv6 server uses DHCPv6 agreement to obtain IPv6 address, recycles DHCPv4-over-DHCPv6 message application IPv4 ground
Location and segment port.Under DHCPv4-over-DHCPv6 server normal operation, DHCPv4-over-DHCPv6 redundant takes
Business device keeps silent status, and the address lease request receiving is ignored.
DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 redundant server are shared with a piece of IPv6
Address pool and IPv4 address pool.Additionally, the little IPv6 of extra is configured on DHCPv4-over-DHCPv6 redundant server
Address pool and IPv4 address pool, for processing new lease information after DHCPv4-over-DHCPv6 server failure.Two
Platform server determines interconnection testing mechanism and confirms whether message detection other side is online, often it is necessary to sending one every 10 seconds and connecting
Individual server receives this kind of message, replys an ACK message to other side.
When DHCPv4-over-DHCPv6 server receives new IPv6 address and DHCPv4-over-DHCPv6 lease
Request is re-rented in request, address, issues IP address first, then sends renewal to DHCPv4-over-DHCPv6 redundant server and disappears
Breath.If issuing IPv6 address, send IPv6-UPDATE message；If issuing IPv4 address, send IPv4-UPDATE
Message.After DHCPv4-over-DHCPv6 redundant server receives IPv6-UPDATE and IPv4-UPDATE message, update
DHCPv6 lease storehouse and DHCPv4-over-DHCPv6 lease storehouse.When DHCPv4-over-DHCPv6 server receive DHCPv6,
DHCPv4-over-DHCPv6 lease releasing request, deletes the corresponding information in lease storehouse, first then to DHCPv4-over-
DHCPv6 redundant server sends lease release message.If IPv6 address discharges, send IPv6-RELEASE message；If
Release IPv4 address, then send IPv4-RELEASE message.That is, two servers will ensure lease synchronizing information under normal circumstances,
Its detailed process comprises the steps：
(1) IPv6 address lease updates
Step 1：4over6 tunnel converges TI to DHCPv6 server application IPv6 address, or address lease updates, releases
Put (DHCPv6 server is in DHCPv4-over-DHCPv6 server).
Step 2：DHCPv6 server issues IPv6 address to 4over6 tunnel convergent point TI, or the renewal of address lease,
Release；Send IPv6-UPDATE message to DHCPv4-over-DHCPv6 redundant server simultaneously.
Step 3：After DHCPv4-over-DHCPv6 redundant server receives this IPv6-UPDATE message, to local
DHCPv6 lease storehouse is updated, and sends IPv6-CONFIRM message to DHCPv4-over-DHCPv6 server simultaneously.
(2) IPv4 address lease updates
Step 1：4over6 tunnel initiate point TI sends IPv4 address to DHCPv4-over-DHCPv6 server and adds port
Section request, or the renewal of address lease, release.
Step 2：DHCPv4-over-DHCPv6 server issues IPv4 address and segment port to 4over6 tunnel initiate point,
Or IPv4 address lease updates, release；Send IPv4-UPDATE to DHCPv4-over-DHCPv6 redundant server to disappear simultaneously
Breath.
Step 3：DHCPv4-over-DHCPv6 redundant server receives IPv4-UPDATE message, to local DHCPv4-
Over-DHCPv6 lease is updated, and sends IPv4-CONFIRM message to DHCPv4-over-DHCPv6 server simultaneously.
When DHCPv4-over-DHCPv6 server fail, DHCPv4-over-DHCPv6 redundant server periodically connects
Can not receive the response of DHCPv4-over-DHCPv6 server, then state can be changed into normal mode from silent mode.
In DHCPv4-over-DHCPv6 server under normal circumstances, 4over6 tunnel initiate point TI in the rental period more than 50%
When send DHCP new information, the current rental period is renewed a contract.
If DHCPv4-over-DHCPv6 server fail is it is impossible to work on.DHCPv4-over-DHCPv6
Redundant server passes through interconnection testing mechanism and cannot receive DHCPv4-over-DHCPv6 server to the response connecting confirmation
During message, start normal mode of operation, safeguard existing 4over6 tunnel lease information, utilize simultaneously independent IPv6 address pool and
IPv4 address pool is user's distribution address of newly reaching the standard grade.When 4over6 tunnel initiate point TI sends unicast when the rental period is more than 50%
RENEW message, and DHCPv4-over-DHCPv6 server is not responded due to fault, then start in rental period 87.5%
REBIND message, is now to send to DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 redundant server
Multicast message, after DHCPv4-over-DHCPv6 redundant server receives REBIND message, to 4over6 tunnel initiate point TI
Rental period is updated.
The detailed process that address above mentioned lease updates is as shown in Fig. 2 comprise the steps：
Step 1：When IPv6 address (or IPv4 address) the lease phase of 4over6 Sui road initiate point TI crosses 50%, to
DHCPv4-over-DHCPv6 server update lease information, if receive DHCPv4-over-DHCPv6 clothes within the designated time
The response of business device, then turn to step 4, otherwise turns to step 2.
Step 2：4over6 tunnel initiate point TI when IPv6 address (or IPv4 address) the lease phase is more than 87.5%, to
The REBIND of DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 redundant server transmission multiast types disappears
Breath.
Step 3：DHCPv4-over-DHCPv6 redundant server receives REBIND message, to 4over6 tunnel initiate point TI
Re-rent request-reply, renew the lease information, turn to step 5.
Step 4：DHCPv4-over-DHCPv6 server receives lease new information, then to 4over6 tunnel initiate point TI
Re-rent request-reply, renew the lease information.
Step 5：The process of renewing the lease terminates.
When DHCPv4-over-DHCPv6 server recovers from fault, need to DHCPv4-over-DHCPv6 redundant
Server sends IPv4-RECOVER message and IPv6-RECOVER message, will from DHCPv4-over-DHCPv6 redundant server
Lease information is updated.After DHCPv4-over-DHCPv6 redundant server receives RECOVER message, with DHCPv4-over-
DHCPv6 server sets up TCP link, updates DHCPv4-over-DHCPv6 server lease information.After the completion of this process,
DHCPv4-over-DHCPv6 server has recovered current lease information, simultaneously DHCPv4-over-DHCPv6 redundant server
Enter silent status.Its detailed process is as shown in figure 3, comprise the steps：
Step 1：DHCPv4-over-DHCPv6 server sends to DHCPv4-over-DHCPv6 redundant server
RECOVER message.
Step 2：After DHCPv4-over-DHCPv6 redundant server receives RECOVER message, set up TCP connect start by
Bar transmits lease information.
Step 3：DHCPv4-over-DHCPv6 server according to the lease information update receiving local lease information bank, to
DHCPv4-over-DHCPv6 redundant server sends ACK message.
Step 4：After all lease information transfers are finished by DHCPv4-over-DHCPv6 redundant server, proceed to mould of mourning in silence
Formula.
There is a kind of situation under this scene, DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 are standby
Help server normal operation, but due to two servers between connection interrupted (as routeing due to the problem of physical equipment in network
Device, cable etc.).A now original network is possible to become two networks it is also possible to other main frames of network can be mutually
Communication, the only connection between DHCPv4-over-DHCPv6 server and redundant server goes wrong.In this case,
DHCPv4-over-DHCPv6 redundant server is changed into normal mode of operation from silent mode provides service for main frame.If there are
New user reaches the standard grade, then distribute address using the individual small address pool of DHCPv4-over-DHCPv6 redundant server configures, protect
Demonstrate,proving new user being capable of normal access network.
When occurring in that above-mentioned situation in network, i.e. disconnecting between two-server, but two-server is all
Normal work.Now two machines provide the user service in the network each being responsible for.When network recovery is normal,
If DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 redundant server lease information are inconsistent, need
Synchronize.The method of synchronization is as follows：
Two-server mutually sends out lease synchronization message IPv4-SYN or IPv6-SYN.When server receives synchronization message
Afterwards, the lease receiving information and the lease information bank of oneself are compared, if the lease information receiving is believed in local lease
Breath does not have in storehouse, then this lease information is added lease information bank, if this lease information exists local, compares the time
Stamp, up-to-date being retained in data base of timestamp value.Meanwhile, often process an IPv4-SYN message, return an IPv4-ACK,
Often process an IPv6-SYN message, return an IPv6-ACK.After the completion of data syn-chronization, DHCPv4-over-DHCPv6 is standby
Help server and enter silent status.
As shown in figure 4, being a server and another server sync lease information process, comprise the steps：
Step 1：Server 1 sends a lease information to server 2.
Step 2：After server 2 receives this lease information, local lease storehouse is found the lease related to this IP address.
If it is found, turning to step 3, otherwise turn to step 4.
Step 3：The timestamp of the timestamp of lease information middle in local lease storehouse and the lease receiving is carried out by server 2
Compare, if local time stamp is up-to-date, abandon the lease receiving, otherwise this local lease is updated to the lease receiving
Information.
Step 4：This lease information is added local lease storehouse.
Step 5：Whether server 1 also has next lease to be sent, and is, goes to step 1, otherwise terminates.
If the synchronization of data to be completed, two-server is needed each to execute said process one time.
The above, be presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.
Claims (9)
1. a kind of 4over6 dynamic address allocation server failure backup method is it is characterised in that initially set up
Lightweight4over6 tunnel, tunneled network includes DHCPv4-over-DHCPv6 server, DHCPv4-over-
DHCPv6 redundant server, 4over6 tunnel initiate point TI and 4over6 tunnel convergent point TC, wherein DHCPv4-over-
DHCPv6 server and DHCPv4-over-DHCPv6 redundant server configures interconnect in same multicast domain, and shared
With a piece of IPv6 address pool and IPv4 address pool, and configuration one is extra on DHCPv4-over-DHCPv6 redundant server
IPv6 address pool and IPv4 address pool, for the new lease information of DHCPv4-over-DHCPv6 server failure post processing；
DHCPv4-over-DHCPv6 redundant server keeps when determining DHCPv4-over-DHCPv6 server normal work mourning in silence
State, does not respond to dhcp message；When DHCPv4-over-DHCPv6 server failure or DHCPv4-over-DHCPv6 are standby
Help server cannot with DHCPv4-over-DHCPv6 server keep connect when, DHCPv4-over-DHCPv6 redundant server
Switch to normal mode from silent mode, dhcp message is processed.
2. 4over6 dynamic address allocation server failure backup method according to claim 1 is it is characterised in that described
The process of setting up in Lightweight4over6 tunnel is：
By DHCPv6 server disposition in DHCPv4-over-DHCPv6 server, 4over6 tunnel initiate point TI connects for user
Enter equipment, be attached with some IPv4 subscriber's main stations downwards, upwardly through IPv6 network with 4over6 tunnel convergent point TC even
Connect, before tunnel configuration generates, the IPv6 address of described 4over6 tunnel initiate point TI is to DHCPv6 server application, DHCPv6
Server while issuing IPv6 address for it, carrying package server containing DHCPv4-over-DHCPv6 in DHCPv6 message
The option of IPv6 address；Described 4over6 tunnel initiate point TI upstream Interface behind configuration of IP v6 address, to DHCPv4-
Over-DHCPv6 server application IPv4 address；The configured IPv6 address of described 4over6 tunnel convergent point TC downstream interface, on
Line interface configured IPv4 address；DHCPv4-over-DHCPv6 server receives the IPv4 address of 4over6 tunnel initiate point TI
After request message, issue IPv4 address and segment port for it, simultaneously by the IPv6 address of 4over6 tunnel initiate point TI and issuing
IPv4 address and port segment information send to 4over6 tunnel convergent point TC, 4over6 tunnel convergent point TC is according to the letter receiving
Breath configuration mapping table.
3. 4over6 dynamic address allocation server failure backup method according to claim 1 is it is characterised in that described
DHCPv4-over-DHCPv6 server includes DHCPv6 server, is responsible for 4over6 tunnel initiate point TI and issues IPv6 address
With IPv4 address and segment port, IPv4 address lease and IPv6 address lease time are consistent.
4. 4over6 dynamic address allocation server failure backup method according to claim 1 is it is characterised in that described
DHCPv4-over-DHCPv6 redundant server every 10 seconds with DHCPv4-over-DHCPv6 server communication to confirm it was
No online.
5. 4over6 dynamic address allocation server failure backup method according to claim 1 is it is characterised in that described
During DHCPv4-over-DHCPv6 server normal work, 4over6 tunnel initiate point TI sends DHCP when the rental period is more than 50%
New information, renewed a contract to the current rental period；When receiving the request of IP address lease, re-rent and during releasing request message, first
Carry out issuing address to 4over6 tunnel initiate point TI, renew the lease and deleting lease operation, then to DHCPv4-over-
DHCPv6 redundant server sends new information, if IP address releasing request message, then needs to 4over6 tunnel convergent point
TC sends message, deletes the corresponding map entry of 4over6 tunnel convergent point TC；If IP address is IPv4 address, send
IPv4-UPDATE message；If IPv6 address, then send IPv6-UPDATE message；DHCPv4-over-DHCPv6 redundant takes
Business device updates the lease storehouse of oneself according to the new information receiving, and keeps and DHCPv4-over-DHCPv6 server lease letter
Breath is consistent.
6. 4over6 dynamic address allocation server failure backup method according to claim 1 is it is characterised in that described
Under DHCPv4-over-DHCPv6 redundant server normal mode：
When there being user equipment to re-rent, 4over6 tunnel initiate point TI sends the RENEW message of unicast when the rental period is more than 50%,
If DHCPv4-over-DHCPv6 server is no responded, user equipment sends multiast types when the rental period is more than 87.5%
REBIND message, now DHCPv4-over-DHCPv6 redundant server receive REBIND message, responded, this address entered
Row is re-rented；
When there being new user equipment to need access network, DHCPv4-over-DHCPv6 redundant server uses described extra
IPv6 address pool and IPv4 address pool are the new user device configuration tunnel accessing, and enable user equipment to use network.
7. 4over6 dynamic address allocation server failure backup method according to claim 1 is it is characterised in that work as
DHCPv4-over-DHCPv6 server, when malfunction is recovered to restart, services to DHCPv4-over-DHCPv6 redundant
Device sends RECOVER message, and DHCPv4-over-DHCPv6 redundant server receives RECOVER message, with DHCPv4-over-
DHCPv6 server is set up TCP and is connected, one by one to DHCPv4-over-DHCPv6 server transport lease information, by all of rent
After about information transfer finishes, DHCPv4-over-DHCPv6 redundant server is changed into silent mode from normal mode.
8. 4over6 dynamic address allocation server failure backup method according to claim 1 is it is characterised in that work as
After physical circuit between DHCPv4-over-DHCPv6 server and DHCPv4-over-DHCPv6 redundant server is unimpeded,
DHCPv4-over-DHCPv6 server sends new information to DHCPv4-over-DHCPv6 redundant server, mutually sends out simultaneously and rents
About synchronizing information, the side receiving lease synchronizing information searches local lease information, if locally there is no this lease information,
This lease information is inserted lease information bank, if lease information bank has this lease, checks this lease information local
Whether it is up-to-date；If up-to-date, then keep lease storehouse constant, if it is not, then using the lease information receiving to rent
About information bank is updated；After the local lease information of oneself is sent by both sides to other side, both sides' lease information bank is protected
Hold consistent, now DHCPv4-over-DHCPv6 redundant server is changed into silent mode from normal mode.
9. 4over6 dynamic address allocation server failure backup method according to claim 8 is it is characterised in that described
Lease synchronization message is IPv4-SYN or IPv6-SYN, wherein IPv4-SYN synchronization IPv4 address, IPv6-SYN synchronization IPv6
Address.
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