CN104270475A - System and method for achieving intercommunication between IPv4 network and IPv6 network based on NAT64 - Google Patents
System and method for achieving intercommunication between IPv4 network and IPv6 network based on NAT64 Download PDFInfo
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- CN104270475A CN104270475A CN201410444590.7A CN201410444590A CN104270475A CN 104270475 A CN104270475 A CN 104270475A CN 201410444590 A CN201410444590 A CN 201410444590A CN 104270475 A CN104270475 A CN 104270475A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/251—Translation of Internet protocol [IP] addresses between different IP versions
Abstract
The present invention discloses a system and method for achieving intercommunication between an IPv4 network and an IPv6 network based on an NAT64, and relates to the field of an IPv6 transitory technology. The method includes the following steps: ensuring that an NAT64 module is connected to the IPv4 network and the IPv6 network to achieve global enabling and interface enabling of functions of the NAT64; receiving, by the NAT64 module, a data message sent from a network side, updating a dynamic table, establishing address mapping information which maintains a sub-module, and obtaining an address 5-tuple flow after translation according to the protocol version of the data message; performing, by the NAT64 module, protocol translation on an IPv4 message head and an IPv6 message head; and forwarding, by an IPv4/IPv6 message forwarding sub-module, a new data message completing the translation of address and the translation of a protocol to a target address. Relevant functions of the NAT64 can be fully achieved on a conventional digital communication product, the performance consumption of equipment and the usage of system resources are effectively reduced, and the working efficiency is increased.
Description
Technical field
The present invention relates to IPv6 transitional technology field, specifically relate to a kind of system and method realizing IPv4 network and IPv6 network interworking based on NAT64.
Background technology
IPv6 (Internet Protocol Version 6, IPv 6) be solve IPv4 (Internet Protocol Version 4, internet protocol version four) the basic solution of address exhaustion problem, but because existing IPv4 user's storage is very large, and most existing network does not support that IPv6 applies, therefore make existing network larger to the difficulty of IPv6 evolution from IPv4.
In order to ensure the smooth transition of user and business, estimate that whole evolution cycle will be a long-term process, that is IPv6 will with IPv4 long-term co-existence.Therefore, IPv6 transition scheme seems particularly important.We are generally divided into three major types at usually said IPv6 transitional technology: two stack, tunnel, NAT-PT (Network Address Translation-Protocol Translation, the network address translation of subsidiary protocol conversion) technology.But often kind of mechanism is not blanket, is all only applicable to a certain or several specific network condition, and usually need to combinationally use with other technologies.
IETF (Internet Engineering Task Force in 2011, Internet engineering duty group) issue RFC (Request For Comments, request for comments) 6146 and RFC6147, redesign a new solution NAT64 (Network Address and Protocol Translation from IPv6Clients to IPv4Servers, by the network address translation of IPv6 client to the subsidiary protocol conversion of IPv4 server) and DNS64 (DNS Extensions for Network Address Translation from IPv6Clients to IPv4Servers, be suitable for the expansion domain name system of NAT64) technology.
Current, IPv6 and IPv4 technology co-existence is in the Internet, and the most contents in the Internet only can be used IPv4, but IPv6 user needs access IPv4 content equally, and this is realized by NAT64 and correlation technique.
NAT64 is a kind of network address and protocol conversion technology of having state, and general only support IPv6 network side user initiates connected reference IPv4 side Internet resources.But NAT64 also supports manual configuration static mappings relation, realize IPv4 network and initiatively initiate connected reference IPv6 network.NAT64 technology achieve IPv6 bag and IPv4 wrap between mutual conversion.NAT64 can realize TCP (Transmission Control Protocol, transmission control protocol), UDP (User Data Protocol, User Datagram Protoco (UDP)), IPv6 and the IPv4 network address under ICMP (Internet Control Message Protocol, Internet Control Message Protocol) agreement and protocol conversion.General and the DNS64 collaborative work of NAT64, does not need to make any amendment in IPv6 client or IPv4 server end.
The shortcoming of tunneling technique needs extra tunnel configuration, inefficiency; The resource consumption of NAT-PT is comparatively large, has a strong impact on the runnability of equipment.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of system and method realizing IPv4 network and IPv6 network interworking based on NAT64 is provided, can lead on product at existing number and intactly realize NAT64 correlation function, effectively reduce the loss of equipment performance and the use of system resource simultaneously, increase work efficiency, harmful effect is not caused to equipment runnability or network environment.
The invention provides a kind of system realizing IPv4 network and IPv6 network interworking based on NAT64, comprise NAT64 module, network management interface, bottom data transceiver interface and configuration data sync cap, described NAT64 module respectively with network management interface, bottom data transceiver interface is connected with configuration data sync cap, described NAT64 module comprises NAT64 and configures submodule, dynamic table is set up and is safeguarded submodule and IPv4/IPv6 message repeating submodule, NAT64 configuration submodule is set up with dynamic table and is safeguarded that submodule is connected, dynamic table is set up and is safeguarded that submodule is connected with IPv4/IPv6 message repeating submodule, NAT64 configures submodule, dynamic table is set up and safeguarded that submodule is all connected with network management interface, dynamic table is set up and is safeguarded that submodule is also connected with configuration data sync cap, and IPv4/IPv6 message repeating submodule, configuration data sync cap are all connected with bottom data transceiver interface,
Described NAT64 configures submodule and is used for: global configuration and the interface configuration of carrying out NAT64 function;
Described dynamic table is set up and is safeguarded that submodule is used for: set up and safeguard dynamic address mapping table, creating and mapping, safeguarding mapping in a session, deleting mapping after the session is completed when producing new session;
Described IPv4/IPv6 message repeating submodule is used for: the address translation and the protocol translation that the message received are carried out to NAT64, then is forwarded from correct interface by the message after the address translation and protocol translation of NAT64.
On the basis of technique scheme, described NAT64 configures submodule and carries out the global configuration of NAT64 function and interface configuration comprises: NAT64 function is enable, IPv6 changes prefix, static address mapping table, IPv4 address pool and enable, max-session number thereof.
On the basis of technique scheme, described NAT64 module possesses an IPv6 address pool and an IPv4 address pool, and IPv6 address pool is used for representing IPv4 address in IPv6 network, and IPv4 address pool is used for representing IPv6 address in IPv4 network; In IPv6 network, represent that the IPv6 address of IPv4 address is made up of three parts: IPv6 prefix, the IPv4 address be embedded into and variable-length suffix.
On the basis of technique scheme, described IPv6 address pool comprises one or more IPv6 prefix.
On the basis of technique scheme, described IPv6 prefix mainly comprises three characteristics:
(1) prefix index value: data type is 16bit unsigned int, carries out choice for use when address translation by prefix index value;
(2) prefix: with array form storing IP v6 prefix;
(3) prefix length: variable prefix length.
On the basis of technique scheme, described prefix length is 32,40,48,56,64 or 96.
On the basis of technique scheme, described IPv4 address pool is made up of the continuous IP v4 address under same subnet section, except the situation of static manual configuration, address maps is all dynamic, and takes IPv6 transport address to the mapping of IPv4 transport address in actual applications; Described IPv4 address pool mainly comprises: (1) address pool index value; (2) IP v4 address, termination IPv4 address and subnet mask; (3) single IPv4 address is common to the quantity of session simultaneously; (4) port numbers of TCP, UDP session and the identifier of ICMP.
On the basis of technique scheme, the structure of the various heads of described IPv4/IPv6 message repeating submodule in dual stack stack needed for definition translation, mainly comprises following several:
Struct ip6_hdr: represent IPv6 head;
Struct ip6_frag: represent IPv6 burst head;
Struct icmp6_hdr: represent ICMPv6 head;
Struct ip: represent IPv4 head;
Struct ippseudo: represent the pseudo-head of the IPv4 being used for Transmission Control Protocol;
Struct icmp2_hdr: represent ICMPv4 head.
The present invention also provides a kind of method realizing IPv4 network and IPv6 network interworking based on NAT64 being applicable to said system, comprises the following steps:
A, guarantee NAT64 model calling IPv4 network and IPv6 network, realize the enable and interface enable of the overall situation of NAT64 function;
B, NAT64 module receives the data message that network side is sent, according to the protocol version of data message, the address mapping information safeguarding submodule set up by Regeneration dynamics table, obtain the address five-tuple after translation: IPv4/IPv6 message repeating submodule judges whether the data message received is new session, if data message is the new session of IPv4 protocol version and maps existence without static address, IPv4/IPv6 message repeating submodule directly abandons this data message; If data message is the new session of IPv6 protocol version, dynamic table is set up and is safeguarded that submodule creates a new address maps; When data message is non-new session, the transport address, source and object transport address that receive data message, according to already present address mapping table, are converted to the form of another protocol version corresponding in mapping table by IPv4/IPv6 message repeating submodule;
C, NAT64 module carries out protocol translation to IPv4 header and IPv6 header:
When IPv4/IPv6 message repeating submodule receives a packet by IPv4 network destined IPv6 network, IPv4 head can be translated as IPv6 head by IPv4/IPv6 message repeating submodule, and initial IP v4 head is removed and replaces to an IPv6 head; Supporting if the transport layer protocol of message is this IPv4/IPv6 message repeating submodule, the School Affairs of transport layer carries out re-computation, and the data field of bag need not be revised;
When IPv4/IPv6 message repeating submodule receive be a destination be the IPv6 packet of IPv4 network time, IPv4/IPv6 message repeating submodule needs IPv6 head to be translated as IPv4 head, and initial IP v6 head will be removed and replaces to a new IPv4 head; ICMPv6, TCP, UDP and datagram congestion control protocol DCCP head all include School Affairs, if mapping address algorithm is not School Affairs neutrality, then before translation, calculate the value of School Affairs, and upgrade ICMP and transport layer header;
For TCP and UDP message, only translation IP head; To icmp packet, translation IP head and ICMP head; If the non-School Affairs of address translation algorithm is neutral, be not then that the transport layer header of the UDP message of 0 carries out re-computation and renewal to the TCP containing pseudo-head, icmp packet and School Affairs; If message is fragment message, then carry out the respective handling of fragment message;
The new data message completing address translation and protocol translation forwards according to destination address by D, IPv4/IPv6 message repeating submodule.
On the basis of technique scheme, steps A comprises the following steps: NAT64 configures global configuration and the interface configuration that submodule carries out NAT64 function: NAT64 function is enable, IPv6 changes prefix, static address mapping table, IPv4 address pool and enable, max-session number thereof.
Compared with prior art, advantage of the present invention is as follows:
The present invention leads to hardware platform resource situation and the software platform characteristic of product in conjunction with existing number, can lead on product at existing number and intactly realize NAT64 correlation function, effectively reduce the loss of equipment performance and the use of system resource simultaneously, increase work efficiency, harmful effect is not caused to equipment runnability or network environment.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the system realizing IPv4 network and IPv6 network interworking in the embodiment of the present invention based on NAT64.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of system realizing IPv4 network and IPv6 network interworking based on NAT64, comprise NAT64 module, network management interface, bottom data transceiver interface and configuration data sync cap, NAT64 module is connected with configuration data sync cap with network management interface, bottom data transceiver interface respectively, NAT64 module and network management interface, bottom data transceiver interface and the collaborative work of configuration data sync cap, could realize complete NAT64 function on datacom device.
NAT64 module comprises NAT64 configuration submodule, dynamic table is set up and safeguarded submodule and IPv4/IPv6 message repeating submodule, NAT64 configuration submodule is set up with dynamic table and is safeguarded that submodule is connected, and dynamic table is set up and safeguarded that submodule is connected with IPv4/IPv6 message repeating submodule.NAT64 configures submodule, dynamic table is set up and safeguarded that submodule is all connected with network management interface, dynamic table is set up and is safeguarded that submodule is also connected with configuration data sync cap, and IPv4/IPv6 message repeating submodule, configuration data sync cap are all connected with bottom data transceiver interface.
NAT64 configures submodule and is used for: global configuration and the interface configuration of carrying out NAT64 function: NAT64 function is enable, IPv6 changes prefix, static address mapping table, IPv4 address pool and enable, max-session number thereof etc., and NAT64 function all needs enable under the overall situation and under interface.
Dynamic table is set up and is safeguarded that submodule is used for: set up and safeguard dynamic address mapping table, creating and mapping, safeguarding mapping in a session, deleting mapping after the session is completed when producing new session.
IPv4/IPv6 message repeating submodule is used for: the address translation and the protocol translation that the message received are carried out to NAT64, then is forwarded from correct interface by the message after the address translation and protocol translation of NAT64.IPv4/IPv6 message repeating submodule is the key components realizing IPv4 network and IPv6 network service.
In order to create address maps, NAT64 module must possess an IPv6 address pool (for representing IPv4 address in IPv6 network) and an IPv4 address pool (for representing IPv6 address in IPv4 network).
In IPv6 network, represent that the IPv6 address of IPv4 address is made up of three parts: IPv6 prefix, the IPv4 address be embedded into and variable-length suffix (suffix is generally set to 0).
IPv6 address pool comprises one or more IPv6 prefix.
IPv6 prefix mainly comprises three characteristics:
(1) prefix index value: data type is 16bit unsigned int, and prefix index value may have multiple, carries out choice for use when address translation by prefix index value;
(2) prefix: with array form storing IP v6 prefix, prefix is the longest is 96;
(3) prefix length: variable prefix length, prefix length can be 32,40,48,56,64 or 96.
IPv4 address pool is made up of the continuous IP v4 address under same subnet section usually.Because IPv4 address space falls sharply, IPv4 address pool is very little, cannot set up the mapping one to one with IPv6 address.Therefore, except the situation of static manual configuration, address maps is all dynamic, and takes IPv6 transport address to the mapping of IPv4 transport address in actual applications, and that is, IP address and port numbers all will participate in translation.
IPv4 address pool mainly comprises: (1) address pool index value; (2) IP v4 address, termination IPv4 address and subnet mask; (3) single IPv4 address is common to the quantity of session simultaneously; (4) port numbers of TCP, UDP session and the identifier of ICMP.
The structure of the various heads of IPv4/IPv6 message repeating submodule in dual stack stack needed for definition translation, mainly comprises following several:
Struct ip6_hdr: represent IPv6 head;
Struct ip6_frag: represent IPv6 burst head;
Struct icmp6_hdr: represent ICMPv6 head;
Struct ip: represent IPv4 head;
Struct ippseudo: represent the pseudo-head of the IPv4 being used for Transmission Control Protocol;
Struct icmp2_hdr: represent ICMPv4 head.
The embodiment of the present invention provides a kind of method realizing IPv4 network and IPv6 network interworking based on NAT64 being applicable to said system, comprises the following steps:
A, guarantee NAT64 model calling IPv4 network and IPv6 network, realize the enable and interface enable of the overall situation of NAT64 function.NAT64 model calling IPv4 or IPv6 network, not only need in the enable NAT64 function of the overall situation, also needs in the interface enable NAT64 function running NAT64 function.NAT64 configures submodule and carries out global configuration and the interface configuration of NAT64 function: NAT64 function is enable, IPv6 changes prefix, static address mapping table, IPv4 address pool and enable, max-session number thereof etc.
B, NAT64 module receives the data message that network side is sent, and according to the protocol version of data message, the address mapping information safeguarding submodule set up by Regeneration dynamics table, obtains the address five-tuple after translation.
IPv4/IPv6 message repeating submodule judges whether the data message received is new session, if data message is the new session of IPv4 protocol version and maps existence without static address, IPv4/IPv6 message repeating submodule directly abandons this data message; If data message is the new session of IPv6 protocol version, dynamic table is set up and is safeguarded that submodule creates a new address maps; When data message is non-new session, the transport address, source (source IP address and source port number) and object transport address (object IP address and destination slogan) that receive data message, according to already present address mapping table, are converted to the form of another protocol version corresponding in mapping table by IPv4/IPv6 message repeating submodule.
C, NAT64 module carries out protocol translation to IPv4 header and IPv6 header.
At present, NAT64 module supports that clean culture UDP, TCP communicate with icmp packet.
When IPv4/IPv6 message repeating submodule receives a packet by IPv4 network destined IPv6 network, IPv4 head can be translated as IPv6 head by IPv4/IPv6 message repeating submodule.Initial IP v4 head is removed and replaces to an IPv6 head.Supporting if the transport layer protocol of message is this IPv4/IPv6 message repeating submodule, so the School Affairs of transport layer may need re-computation.The data field of bag need not be revised.
When IPv4/IPv6 message repeating submodule receive be a destination be the IPv6 packet of IPv4 network time, IPv4/IPv6 message repeating submodule needs IPv6 head to be translated as IPv4 head.Initial IP v6 head will be removed and replaces to a new IPv4 head.Due to ICMPv6 (Internet Control Message Protocol Version 6, sixth version ICMP), TCP, UDP and DCCP (Datagram Congestion Control Protocol, datagram congestion control protocol) head all includes School Affairs, therefore, if mapping address algorithm is not School Affairs neutrality, then must calculate the value of School Affairs before translation, and ICMP and transport layer header are upgraded.
Ordinary circumstance, only need translate IP head for TCP and UDP message, to icmp packet, not only needs translation IP head, also should translate ICMP head simultaneously.
In addition, if the non-School Affairs of address translation algorithm is neutral, be not then that the transport layer header of the UDP message of 0 carries out re-computation and renewal to the TCP containing pseudo-head, icmp packet and School Affairs.
If message is fragment message, then carry out the respective handling of fragment message.
The new data message completing address translation and protocol translation forwards according to destination address by D, IPv4/IPv6 message repeating submodule.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these amendments and modification are within the scope of the claims in the present invention and equivalent technologies thereof, then these revise and modification also within protection scope of the present invention.
The prior art that the content do not described in detail in specification is known to the skilled person.
Claims (10)
1. one kind realizes the system of IPv4 network and IPv6 network interworking based on NAT64, comprise NAT64 module, network management interface, bottom data transceiver interface and configuration data sync cap, described NAT64 module respectively with network management interface, bottom data transceiver interface is connected with configuration data sync cap, it is characterized in that: described NAT64 module comprises NAT64 and configures submodule, dynamic table is set up and is safeguarded submodule and IPv4/IPv6 message repeating submodule, NAT64 configuration submodule is set up with dynamic table and is safeguarded that submodule is connected, dynamic table is set up and is safeguarded that submodule is connected with IPv4/IPv6 message repeating submodule, NAT64 configures submodule, dynamic table is set up and safeguarded that submodule is all connected with network management interface, dynamic table is set up and is safeguarded that submodule is also connected with configuration data sync cap, and IPv4/IPv6 message repeating submodule, configuration data sync cap are all connected with bottom data transceiver interface,
Described NAT64 configures submodule and is used for: global configuration and the interface configuration of carrying out NAT64 function;
Described dynamic table is set up and is safeguarded that submodule is used for: set up and safeguard dynamic address mapping table, creating and mapping, safeguarding mapping in a session, deleting mapping after the session is completed when producing new session;
Described IPv4/IPv6 message repeating submodule is used for: the address translation and the protocol translation that the message received are carried out to NAT64, then is forwarded from correct interface by the message after the address translation and protocol translation of NAT64.
2. the as claimed in claim 1 system realizing IPv4 network and IPv6 network interworking based on NAT64, is characterized in that: described NAT64 configuration submodule carries out the global configuration of NAT64 function and interface configuration comprises: NAT64 function is enable, IPv6 changes prefix, static address mapping table, IPv4 address pool and enable, max-session number thereof.
3. the system realizing IPv4 network and IPv6 network interworking based on NAT64 as claimed in claim 1, it is characterized in that: described NAT64 module possesses an IPv6 address pool and an IPv4 address pool, IPv6 address pool is used for representing IPv4 address in IPv6 network, and IPv4 address pool is used for representing IPv6 address in IPv4 network; In IPv6 network, represent that the IPv6 address of IPv4 address is made up of three parts: IPv6 prefix, the IPv4 address be embedded into and variable-length suffix.
4. the system realizing IPv4 network and IPv6 network interworking based on NAT64 as claimed in claim 3, is characterized in that: described IPv6 address pool comprises one or more IPv6 prefix.
5. the system realizing IPv4 network and IPv6 network interworking based on NAT64 as claimed in claim 3, is characterized in that: described IPv6 prefix mainly comprises three characteristics:
(1) prefix index value: data type is 16bit unsigned int, carries out choice for use when address translation by prefix index value;
(2) prefix: with array form storing IP v6 prefix;
(3) prefix length: variable prefix length.
6. the system realizing IPv4 network and IPv6 network interworking based on NAT64 as claimed in claim 5, is characterized in that: described prefix length is 32,40,48,56,64 or 96.
7. the system realizing IPv4 network and IPv6 network interworking based on NAT64 as claimed in claim 3, it is characterized in that: described IPv4 address pool is made up of the continuous IP v4 address under same subnet section, except the situation of static manual configuration, address maps is all dynamic, and takes IPv6 transport address to the mapping of IPv4 transport address in actual applications; Described IPv4 address pool mainly comprises: (1) address pool index value; (2) IP v4 address, termination IPv4 address and subnet mask; (3) single IPv4 address is common to the quantity of session simultaneously; (4) port numbers of TCP, UDP session and the identifier of ICMP.
8. the system realizing IPv4 network and IPv6 network interworking based on NAT64 according to any one of claim 1 to 7, it is characterized in that: the structure of the various heads of described IPv4/IPv6 message repeating submodule in dual stack stack needed for definition translation, mainly comprises following several:
Struct ip6_hdr: represent IPv6 head;
Struct ip6_frag: represent IPv6 burst head;
Struct icmp6_hdr: represent ICMPv6 head;
Struct ip: represent IPv4 head;
Struct ippseudo: represent the pseudo-head of the IPv4 being used for Transmission Control Protocol;
Struct icmp2_hdr: represent ICMPv4 head.
9. be applicable to the method realizing IPv4 network and IPv6 network interworking based on NAT64 of system according to any one of claim 1 to 8, it is characterized in that, comprise the following steps:
A, guarantee NAT64 model calling IPv4 network and IPv6 network, realize the enable and interface enable of the overall situation of NAT64 function;
B, NAT64 module receives the data message that network side is sent, according to the protocol version of data message, the address mapping information safeguarding submodule set up by Regeneration dynamics table, obtain the address five-tuple after translation: IPv4/IPv6 message repeating submodule judges whether the data message received is new session, if data message is the new session of IPv4 protocol version and maps existence without static address, IPv4/IPv6 message repeating submodule directly abandons this data message; If data message is the new session of IPv6 protocol version, dynamic table is set up and is safeguarded that submodule creates a new address maps; When data message is non-new session, the transport address, source and object transport address that receive data message, according to already present address mapping table, are converted to the form of another protocol version corresponding in mapping table by IPv4/IPv6 message repeating submodule;
C, NAT64 module carries out protocol translation to IPv4 header and IPv6 header:
When IPv4/IPv6 message repeating submodule receives a packet by IPv4 network destined IPv6 network, IPv4 head can be translated as IPv6 head by IPv4/IPv6 message repeating submodule, and initial IP v4 head is removed and replaces to an IPv6 head; Supporting if the transport layer protocol of message is this IPv4/IPv6 message repeating submodule, the School Affairs of transport layer carries out re-computation, and the data field of bag need not be revised;
When IPv4/IPv6 message repeating submodule receive be a destination be the IPv6 packet of IPv4 network time, IPv4/IPv6 message repeating submodule needs IPv6 head to be translated as IPv4 head, and initial IP v6 head will be removed and replaces to a new IPv4 head; ICMPv6, TCP, UDP and datagram congestion control protocol DCCP head all include School Affairs, if mapping address algorithm is not School Affairs neutrality, then before translation, calculate the value of School Affairs, and upgrade ICMP and transport layer header;
For TCP and UDP message, only translation IP head; To icmp packet, translation IP head and ICMP head; If the non-School Affairs of address translation algorithm is neutral, be not then that the transport layer header of the UDP message of 0 carries out re-computation and renewal to the TCP containing pseudo-head, icmp packet and School Affairs; If message is fragment message, then carry out the respective handling of fragment message;
The new data message completing address translation and protocol translation forwards according to destination address by D, IPv4/IPv6 message repeating submodule.
10. the method realizing IPv4 network and IPv6 network interworking based on NAT64 as claimed in claim 9, is characterized in that: steps A comprises the following steps: NAT64 configures global configuration and the interface configuration that submodule carries out NAT64 function: NAT64 function is enable, IPv6 changes prefix, static address mapping table, IPv4 address pool and enable, max-session number thereof.
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