CN103905312A - IPv6/IPv4 protocol translation gateway and data message processing method - Google Patents
IPv6/IPv4 protocol translation gateway and data message processing method Download PDFInfo
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Abstract
The invention relates to an IPv6/IPv4 protocol translation gateway and a data message processing method. The IPv6/IPv4 protocol translation gateway comprises a virtual machine migration manager which is used for tracking state change of virtual machine server migration, and a communication interface is arranged between the virtual machine migration manager and a cloud computing integrated scheduling platform of an IPv4 cloud service; a mapping table saving unit which is used for saving and updating a local state table, a migration state table and a home state table according to state change information of the virtual machine server migration acquired by the virtual machine migration manager; a network address conversion unit which is used for performing network address conversion of an IPv6/IPv4 protocol on a data message according to the local state table; a synthetic prefix conversion unit which is used for performing conversion of an IPv6 synthetic prefix after virtual machine migration or before migration on the IPv6 data message according to the migration state table or the home state table; and a routing forwarding unit which is used for forwarding the data message in a routing way. Data communication between an IPv6 user and the IPv4 cloud computing service can be realized in an application environment of cloud computing distributed flexible scheduling.
Description
Technical field
The present invention relates to telecommunications and IT application technology, relate in particular to a kind of IPv6/IPv4 protocol translation gateway and data message processing method.
Background technology
The day of running out along with IPv4 address closes on day by day, and the development of Next Generation Internet is faced with stern challenge, and IPv4 has become common recognition and unique effective solution of industry to IPv6 transition.Meanwhile, cloud computing, as application model of new generation, also just surges forward, and will more and more have a deep effect on people's life.
But, IPv6 user's development and cloud computing service application can not ensure in full accord to the migration of IPv6, the IPv6ization of each business platform of cloud computing and application system immature at present, therefore, after IPv6 user development, also exist and the scene demand of IPv4 cloud computing business platform intercommunication, this is supported with regard to the assistance that needs business conversion platform.
Conventionally, present business conversion platform is to design towards single server or single Internet data center (Internet Data Center is called for short IDC) machine room.Business conversion platform can Adoption Network layer protocol the mode of translation IPv6 protocol data message is converted to IPv4 protocol data message, like this, in the time that business platform does not carry out IPv6 upgrading, can realize the access support to IPv6 user.This implementation pattern can promote the flow of addressable business tine and IPv6 network in IPv6 network greatly, reduce the migration threshold of ICP to IPv6, but owing to conventionally needing the state mapping relation of in store IPv6 and IPv4 address transition in this class platform, therefore the business migration system that, this class is single can there are the following problems in the applied environment of the distributed flexible dispatching of cloud computing:
1) single business migration system cannot be known the state transition situation of virtual machine, therefore can not realize for the real-time response under the empty machine migration of cloud computing scene.
2) single business migration system cannot forward operation to the flow after empty machine migration, and adopts the large double layer network of IDC to forward the flow fail safe hidden danger mixed with user's effluent amount between presence server.
3) single business migration system cannot realize integrated dispatch, and the address prefix that cannot realize between multiple gateway is unified configuration management.
Summary of the invention
The object of the invention is to propose a kind of IPv6/IPv4 protocol translation gateway and data message processing method, can in the applied environment of the distributed flexible dispatching of cloud computing, realize the data communication between IPv6 user and IPv4 cloud computing service.
For achieving the above object, the invention provides a kind of IPv6/IPv4 protocol translation gateway, comprising:
Virtual machine (vm) migration manager, and there is communication interface between the cloud computing integrated dispatch platform of IPv4 cloud service, for following the tracks of the state variation of virtual machine server migration;
Mapping table storage unit, for the state change information of the virtual machine server migration that obtains according to described virtual machine (vm) migration manager, preserves and upgrades local state table, transition state table and local state table;
Network address translation unit, for carrying out the network address translation of IPv6/IPv4 agreement to data message according to the local state table of described mapping table storage unit;
Synthetic prefix converting unit, for the conversion of the synthetic prefix of IPv6 after IPv6 data message being carried out to virtual machine (vm) migration according to the transition state table of described mapping table storage unit or local state table or before migration;
Routing forwarding unit, for carrying out routing forwarding to data message.
Further, also comprise:
Synthetic prefix dispensing unit, is used to described IPv6/IPv4 protocol translation gateway configuration public network IP v6 to synthesize prefix;
IPv4 address pool management unit is the user configured IPv4 address pool of IPv6 for management.
Further, described local state table comprises the synthetic prefix of IPv4 address, IPv6 of virtual machine server and the mapping relations record of expired time, described mapping table storage unit, specifically for when obtain the state change information that virtual machine server moves out from described virtual machine (vm) migration manager, is deleted mapping relations record corresponding in described local IP access table; When obtain the state change information that virtual machine server moves into from described virtual machine (vm) migration manager, newly-increased corresponding mapping relations record in described local IP access table.
Further, described transition state table comprises that the IPv6 after IPv4 address, the migration of moving virtual machine server synthesizes the mapping relations record of prefix and transit time, described mapping table storage unit is specifically in the time obtaining the state change information of virtual machine server migration from described virtual machine (vm) migration manager, the IPv6 in described transition state table after newly-increased migration synthesizes mapping relations record corresponding to prefix.
Further, described local state table comprises that the IPv6 before IPv4 address, the migration of moving virtual machine server synthesizes the mapping relations record of prefix and transit time, described mapping table storage unit is specifically in the time obtaining the state change information of virtual machine server migration from described virtual machine (vm) migration manager, the IPv6 in the state table of described local before newly-increased migration synthesizes mapping relations record corresponding to prefix.
Further, described mapping table storage unit is also when carrying out the network address translation of IPv6/IPv4 agreement in described network address translation unit to data message, for mapping status record is set up in each user or each connection, described mapping status record comprises the mapping relations of the source port number before the User IP v6 address before IPv4 address, the conversion of virtual machine server, User IP v4 address, the conversion after conversion and the source port number after conversion.
For achieving the above object, the invention provides a kind of uplink data messages processing method based on aforementioned IPv6/IPv4 protocol translation gateway, comprising:
When described IPv6/IPv4 protocol translation gateway receives up IPv6 data message, whether the destination address that judges described IPv6 data message is present in the local local state table of preserving, if be present in described local state table, according to described local state table, described IPv6 data message is carried out to the network address translation of IPv6 agreement to IPv4 agreement, be converted to IPv4 data message, and carry out routing forwarding, otherwise whether the destination address that continues the described IPv6 data message of inquiry is present in the local transition state table of preserving, if be present in described transition state table, according to the matched record in described transition state table, described IPv6 data message is carried out the conversion of the synthetic prefix of IPv6 after virtual machine (vm) migration, then carry out routing forwarding, otherwise abandon described IPv6 data message,
Another IPv6/IPv4 protocol translation gateway that receives the new IPv6 data message after the synthetic prefix conversion of IPv6 after virtual machine (vm) migration judges whether the destination address of described new IPv6 data message is present in the local local state table of preserving, if be present in described local state table, according to described local state table, described new IPv6 data message is carried out to the network address translation of IPv6 agreement to IPv4 agreement, be converted to IPv4 data message, and carry out routing forwarding.
For achieving the above object, the invention provides a kind of method for processing downlink data message based on aforementioned IPv6/IPv4 protocol translation gateway, comprising:
When described IPv6/IPv4 protocol translation gateway receives descending IPv4 data message, the local state table of preserving according to this locality carries out the network address translation of IPv4 agreement to IPv6 agreement to described IPv4 data message, is converted to IPv6 data message;
Whether the source address that described IPv6/IPv4 protocol translation gateway is inquired about described IPv6 data message is present in the local local state table of preserving, if be present in the state table of described local, according to the matched record in the state table of described local, described IPv6 data message is carried out the conversion of the synthetic prefix of IPv6 before virtual machine (vm) migration, then carry out routing forwarding, otherwise directly described IPv6 data message is carried out to routing forwarding.
Based on technique scheme, the present invention realizes network address translation and the business migration of the data message between IPv6 user and IPv4 cloud service by IPv6/IPv4 protocol translation gateway, can provide cloud computing service to service request person Correspondent Node across IPv4/IPv6 network, realize in cloud computing and initiate to move online from host virtual machine according to resource focus, and can cross over IPv4/IPv6 network and realize virtual machine and move online, and can coordinate the network evolution Gradually Deploy of IPv6, there is good exploitativeness.
Than existing single business migration system, the present invention has the following advantages:
1, in IPv6/IPv4 protocol translation gateway of the present invention, be provided with virtual machine (vm) migration manager, can follow the tracks of from the communication interface of the cloud computing integrated dispatch platform of IPv4 cloud service the state variation of virtual machine server migration, thereby the situation of virtual machine server migration effectively detected, obtain the correlation behavior information of virtual machine server migration, than existing single business migration system, IPv6/IPv4 protocol translation gateway of the present invention can be realized for the real-time response under the empty machine migration of cloud computing scene.
2, cannot forward operation to the flow after empty machine migration than existing single business migration system, and adopt the large double layer network of IDC to forward the flow fail safe hidden danger mixed with user's effluent amount between presence server, IPv6/IPv4 protocol translation gateway of the present invention can an effectively user-isolated flow and cloud computing server between flow, ensure better that customer flow forwards and cloud computing server between the fail safe transmitted.
3, cannot realize integrated dispatch than existing single business migration system, the address prefix that cannot realize between multiple gateway is unified the problem of configuration management, IPv6/IPv4 protocol translation gateway of the present invention can effectively be processed mapping and the conversion of the address prefix between multiple gateway, the collaborative distributed migration of the whole network.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of an embodiment of IPv6/IPv4 protocol translation gateway of the present invention.
Fig. 2 is the example schematic diagram of local state table in IPv6/IPv4 protocol translation gateway embodiment of the present invention.
Fig. 3 is the example schematic diagram of transition state table in IPv6/IPv4 protocol translation gateway embodiment of the present invention.
Fig. 4 is the example schematic diagram of local state table in IPv6/IPv4 protocol translation gateway embodiment of the present invention.
Fig. 5 is the example schematic diagram of mapping status table in IPv6/IPv4 protocol translation gateway embodiment of the present invention.
Fig. 6 is the communication schematic diagram that adopts IPv6/IPv4 protocol translation gateway embodiment of the present invention to carry out data message processing.
Fig. 7 is the schematic flow sheet of an embodiment of uplink data messages processing method of the present invention.
Fig. 8 is the schematic flow sheet of an embodiment of method for processing downlink data message of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
As shown in Figure 1, be the structural representation of an embodiment of IPv6/IPv4 protocol translation gateway of the present invention.In the present embodiment, IPv6/IPv4 protocol translation gateway comprises: virtual machine (vm) migration manager 1, mapping table storage unit 2, network address translation unit 3, synthetic prefix converting unit 4 and routing forwarding unit 5.
Between the cloud computing integrated dispatch platform of virtual machine (vm) migration manager 1 and IPv4 cloud service, there is communication interface, can follow the tracks of the state variation of virtual machine server migration.Having obtained after the state change information of virtual machine server migration, can notify in time to mapping table storage unit 2 mapping table of preserving is upgraded.
The state change information of virtual machine server that mapping table storage unit 2 can obtain according to virtual machine (vm) migration manager 1 migration, preserves and upgrades local state table, transition state table and local state table.Local state table, transition state table and local state table be respectively referring to the example in Fig. 2-4, after will be described in detail, wouldn't describe in detail here.
The network address translation of IPv6/IPv4 agreement is responsible for according to the local state table in mapping table storage unit 2, data message being carried out in network address translation unit 3.
The conversion of the synthetic prefix of IPv6 after synthetic prefix converting unit 4 is responsible for, according to the transition state table in mapping table storage unit 2 or local state table, IPv6 data message is carried out to virtual machine (vm) migration or before migration.
Routing forwarding unit 5 is responsible for data message after treatment to carry out corresponding routing forwarding.
In reality is implemented, IPv6/IPv4 protocol translation gateway can adopt by region and dispose, and distributed earth is deployed in different IDC outlet sides, can adopt the mode of dual-machine redundancy backup to improve reliability.
IPv6/IPv4 protocol translation gateway need to complete the function such as cloud computing business migration and the translation of IPv6/IPv4 data message simultaneously, therefore IPv6/IPv4 protocol translation gateway can also comprise synthetic prefix dispensing unit and IPv4 address pool management unit, wherein synthetic prefix dispensing unit is responsible for the synthetic prefix of IPv6/IPv4 protocol translation gateway configuration whole world routable public network IP v6, and IPv4 address pool management unit is in order to make IPv6 user can access the IPv4 address pool that IPv4 cloud computing resources configures for management.
The virtual machine server of each IPv4 cloud computing has all configured a publicly-owned address of global routable IPv4, by can synthesize the destination address of a corresponding IPv6 address as IPv6 user access in conjunction with IPv6 prefix, and IPv6 user also can obtaining an IPv4 address in IPv4 address pool after the conversion of IPv6/IPv4 protocol translation gateway.
Due to the particularity of cloud computing applied environment, in the time that service is provided for IPv6 user, may there is the situations such as migration in virtual machine server, same IPv6 user can carry out Transformation Service by different IPv6/IPv4 protocol translation gateways in the time carrying out procotol conversion, therefore, need address pool and the mapping scheme of the multiple IPv6/IPv4 protocol translation of unified planning gateway, thereby guarantee that the IPv4 address of same IPv6 user after conversion is unique constant.
In the environment of cloud computing; first each virtual machine server can register an initialized positional information conventionally; for guaranteeing that the synthetic IPv6 address of server and communication identifier that IPv6 user obtains remain unchanged; address in AAAA that virtual machine server obtains record should be the synthetic IPv6 address of the initial IDC prefix of this server institute correspondence, does not change with the migration of virtual machine server.
Respectively the local state table in IPv6/IPv4 protocol translation gateway, transition state table and local state table are described below.
1, local state table
Referring to the example of Fig. 2, in local state table, can comprise the synthetic prefix of IPv4 address, IPv6 of many virtual machine server and the mapping relations record of expired time, this mapping relations record shifts to an earlier date pre-configured, can adopt the mode of polymerization to reduce the quantity of list item.
Mapping table storage unit is in the time obtaining the state change information that virtual machine server moves out from virtual machine (vm) migration manager, should delete mapping relations record corresponding in local IP access table, and when obtain the state change information that virtual machine server moves into from virtual machine (vm) migration manager, should in local IP access table, increase corresponding mapping relations record newly.
2, transition state table
Referring to the example of Fig. 3, in transition state table, can comprise that the IPv6 after IPv4 address, the migration that the virtual machine server (moving virtual machine server) of moving occurs synthesizes the mapping relations record of prefix (expression positional information) and transit time.Mapping table storage unit is in the time obtaining the state change information of virtual machine server migration from virtual machine (vm) migration manager, the IPv6 in transition state table after newly-increased migration synthesizes mapping relations record corresponding to prefix.
3, local state table
Referring to the example of Fig. 4, in the state table of local, can comprise that the IPv6 before IPv4 address, the migration that the virtual machine server (moving virtual machine server) of moving occurs synthesizes the mapping relations record of prefix (expression positional information) and transit time, mapping table storage unit is in the time obtaining the state change information of virtual machine server migration from virtual machine (vm) migration manager, the IPv6 in the state table of local before newly-increased migration synthesizes mapping relations record corresponding to prefix.
In mapping table storage unit except preserving above-mentioned three tables, can also safeguard mapping state table, it is the example of Fig. 5, when mapping table storage unit is carried out the network address translation of IPv6/IPv4 agreement in network address translation unit to data message, for mapping status record is set up in each user or each connection, mapping status record comprises the mapping relations of the source port number before the User IP v6 address before IPv4 address, the conversion of virtual machine server, User IP v4 address, the conversion after conversion and the source port number after conversion.
For the migration scene of the virtual machine server under cloud computing environment, the mapping table storage unit of IPv6/IPv4 protocol translation gateway has recorded state and the prefix corresponding relation of virtual machine server before and after migration.Utilize these mapping tables, the prefix conversion (also claiming NAT66) that IPv6/IPv4 protocol translation gateway just can be realized carrying out IPv6 between the virtual machine server after IPv6 user and migration is processed, and has realized the Operational Visit continuity after empty machine migration.
The communication situation of the up-downgoing data message processing after Fig. 6 shows virtual machine server and moves.Wherein for providing the virtual machine server of cloud service, IPv6 user is first registered in initialized IPv6/IPv4 protocol translation gateway (being protocol translation gateway-H), through migration, virtual machine server moves to new IPv6/IPv4 protocol translation gateway (being protocol translation gateway-V), and protocol translation gateway-H and protocol translation gateway-V are respectively corresponding IPv6/IPv4 protocol translation gateways before and after virtual machine server migration so.
The uplink traffic of sending for IPv6 user, because the IPv6 address that IPv6 user obtains is constant, therefore first this uplink traffic still can be routed to protocol translation gateway-H, and the replacement of the synthetic prefix after migration, routes to protocol translation gateway-V by this uplink traffic.Protocol translation gateway-V carries out the protocol translation operation of IPv6 to IPv4 to this uplink traffic, then forwards.Can find out, uplink traffic exists route to rotate.
The downlink traffic of receiving for protocol translation gateway-V, protocol translation gateway-V can carry out the protocol translation operation of IPv4 to IPv6 to this downlink traffic, and continues the replacement of the synthetic prefix before migration, then forwards.Can find out, downlink traffic does not exist route to rotate.
By the structure to the each embodiment of IPv6/IPv4 protocol translation gateway of the present invention and the explanation of function above, the processing of respectively how IPv6/IPv4 protocol translation gateway being carried out to uplink and downlink data message below by Fig. 7 and Fig. 8 describes.
As shown in Figure 7, be the schematic flow sheet of an embodiment of uplink data messages processing method of the present invention.In the present embodiment, uplink data messages processing method comprises:
Whether the destination address that step 104, IPv6/IPv4 protocol translation gateway continue the described IPv6 data message of inquiry is present in the local transition state table of preserving, if be present in described transition state table, perform step 105, otherwise abandon described IPv6 data message;
Step 107, this another IPv6/IPv4 protocol translation gateway judge whether the destination address of new IPv6 data message is present in the local local state table of preserving, if be present in described local state table, according to described local state table, described new IPv6 data message is carried out to the network address translation of IPv6 agreement to IPv4 agreement, be converted to IPv4 data message, and perform step 108;
As shown in Figure 8, be the schematic flow sheet of an embodiment of method for processing downlink data message of the present invention.In the present embodiment, method for processing downlink data message comprises:
Step 201, IPv6/IPv4 protocol translation gateway receive descending IPv4 data message;
The local state table that step 202, IPv6/IPv4 protocol translation gateway are preserved according to this locality carries out the network address translation of IPv4 agreement to IPv6 agreement to described IPv4 data message, is converted to IPv6 data message;
Whether the source address that step 203, IPv6/IPv4 protocol translation gateway are inquired about described IPv6 data message is present in the local local state table of preserving, if be present in the state table of described local, performs step 204, otherwise execution step 205;
Step 204, IPv6/IPv4 protocol translation gateway carry out the conversion of the synthetic prefix of IPv6 before virtual machine (vm) migration to described IPv6 data message according to the matched record in the state table of described local, then carry out routing forwarding;
Step 205, IPv6/IPv4 protocol translation gateway directly carry out routing forwarding to described IPv6 data message.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characterictic is equal to replacement the specific embodiment of the present invention; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request protection of the present invention.
Claims (8)
1. an IPv6/IPv4 protocol translation gateway, comprising:
Virtual machine (vm) migration manager, and there is communication interface between the cloud computing integrated dispatch platform of IPv4 cloud service, for following the tracks of the state variation of virtual machine server migration;
Mapping table storage unit, for the state change information of the virtual machine server migration that obtains according to described virtual machine (vm) migration manager, preserves and upgrades local state table, transition state table and local state table;
Network address translation unit, for carrying out the network address translation of IPv6/IPv4 agreement to data message according to the local state table of described mapping table storage unit;
Synthetic prefix converting unit, for the conversion of the synthetic prefix of IPv6 after IPv6 data message being carried out to virtual machine (vm) migration according to the transition state table of described mapping table storage unit or local state table or before migration;
Routing forwarding unit, for carrying out routing forwarding to data message.
2. IPv6/IPv4 protocol translation gateway according to claim 1, wherein also comprises:
Synthetic prefix dispensing unit, is used to described IPv6/IPv4 protocol translation gateway configuration public network IP v6 to synthesize prefix;
IPv4 address pool management unit is the user configured IPv4 address pool of IPv6 for management.
3. IPv6/IPv4 protocol translation gateway according to claim 2, wherein said local state table comprises the synthetic prefix of IPv4 address, IPv6 of virtual machine server and the mapping relations record of expired time, described mapping table storage unit, specifically for when obtain the state change information that virtual machine server moves out from described virtual machine (vm) migration manager, is deleted mapping relations record corresponding in described local IP access table; When obtain the state change information that virtual machine server moves into from described virtual machine (vm) migration manager, newly-increased corresponding mapping relations record in described local IP access table.
4. IPv6/IPv4 protocol translation gateway according to claim 2, wherein said transition state table comprises that the IPv6 after IPv4 address, the migration of moving virtual machine server synthesizes the mapping relations record of prefix and transit time, described mapping table storage unit is specifically in the time obtaining the state change information of virtual machine server migration from described virtual machine (vm) migration manager, the IPv6 in described transition state table after newly-increased migration synthesizes mapping relations record corresponding to prefix.
5. IPv6/IPv4 protocol translation gateway according to claim 2, wherein said local state table comprises that the IPv6 before IPv4 address, the migration of moving virtual machine server synthesizes the mapping relations record of prefix and transit time, described mapping table storage unit is specifically in the time obtaining the state change information of virtual machine server migration from described virtual machine (vm) migration manager, the IPv6 in the state table of described local before newly-increased migration synthesizes mapping relations record corresponding to prefix.
6. according to the arbitrary described IPv6/IPv4 protocol translation gateway of claim 3 ~ 5, wherein said mapping table storage unit is also when carrying out the network address translation of IPv6/IPv4 agreement in described network address translation unit to data message, for mapping status record is set up in each user or each connection, described mapping status record comprises the mapping relations of the source port number before the User IP v6 address before IPv4 address, the conversion of virtual machine server, User IP v4 address, the conversion after conversion and the source port number after conversion.
7. the uplink data messages processing method based on the arbitrary described IPv6/IPv4 protocol translation gateway of claim 1 ~ 6, comprising:
When described IPv6/IPv4 protocol translation gateway receives up IPv6 data message, whether the destination address that judges described IPv6 data message is present in the local local state table of preserving, if be present in described local state table, according to described local state table, described IPv6 data message is carried out to the network address translation of IPv6 agreement to IPv4 agreement, be converted to IPv4 data message, and carry out routing forwarding, otherwise whether the destination address that continues the described IPv6 data message of inquiry is present in the local transition state table of preserving, if be present in described transition state table, according to the matched record in described transition state table, described IPv6 data message is carried out the conversion of the synthetic prefix of IPv6 after virtual machine (vm) migration, then carry out routing forwarding, otherwise abandon described IPv6 data message,
Another IPv6/IPv4 protocol translation gateway that receives the new IPv6 data message after the synthetic prefix conversion of IPv6 after virtual machine (vm) migration judges whether the destination address of described new IPv6 data message is present in the local local state table of preserving, if be present in described local state table, according to described local state table, described new IPv6 data message is carried out to the network address translation of IPv6 agreement to IPv4 agreement, be converted to IPv4 data message, and carry out routing forwarding.
8. the method for processing downlink data message based on the arbitrary described IPv6/IPv4 protocol translation gateway of claim 1 ~ 6, comprising:
When described IPv6/IPv4 protocol translation gateway receives descending IPv4 data message, the local state table of preserving according to this locality carries out the network address translation of IPv4 agreement to IPv6 agreement to described IPv4 data message, is converted to IPv6 data message;
Whether the source address that described IPv6/IPv4 protocol translation gateway is inquired about described IPv6 data message is present in the local local state table of preserving, if be present in the state table of described local, according to the matched record in the state table of described local, described IPv6 data message is carried out the conversion of the synthetic prefix of IPv6 before virtual machine (vm) migration, then carry out routing forwarding, otherwise directly described IPv6 data message is carried out to routing forwarding.
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