CN104270475B - The system and method for IPv4 networks and IPv6 network interworkings is realized based on NAT64 - Google Patents
The system and method for IPv4 networks and IPv6 network interworkings is realized based on NAT64 Download PDFInfo
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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
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Abstract
The invention discloses a kind of system and method that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is related to IPv6 transitional technologies field, this method comprises the following steps：Ensure NAT64 modules connection IPv4 networks and IPv6 networks, realize that the global of NAT64 functions is enabled and interface enable；NAT64 modules receive the data message that network side is sent, according to the protocol version of data message, update dynamic table and set up the address mapping information for safeguarding submodule, obtain the address five-tuple after translation；NAT64 modules carry out protocol translation to IPv4 headers and IPv6 headers；IPv4/IPv6 messages forward submodule to forward the new data message for completing address translation and protocol translation according to destination address.The present invention can lead on product in existing number intactly realizes NAT64 correlation functions, effectively reduces the loss of equipment performance and the use of system resource, improves operating efficiency.
Description
Technical field
The present invention relates to IPv6 transitional technologies field, it is specifically related to one kind and IPv4 networks and IPv6 is realized based on NAT64
The system and method for network interworking.
Background technology
IPv6 (Internet Protocol Version 6, IPv 6) is to solve IPv4 (Internet
Protocol Version 4, internet protocol version four) address exhaustion problem basic solution, but be due to existing
IPv4 user's storage is very big, and most existing networks do not support IPv6 to apply, hence in so that existing network is from IPv4 to IPv6 evolution
Difficulty it is larger.
In order to ensure the smooth transition of user and business, it is contemplated that whole evolution cycle will be a long-term process, that is,
Say that IPv6 will be with IPv4 long-term co-existence.Therefore, IPv6 transition schemes are particularly important.Our usually said IPv6 transition
Technology is generally divided into three major types：Double stacks, tunnel, NAT-PT (Network Address Translation-Protocol
Translation, the network address translation of subsidiary protocol conversion) technology.But every kind of mechanism be not it is blanket, all only
Suitable for a certain or several specific network conditions, and usually need to be applied in combination with other technologies.
IETF (Internet Engineering Task Force, Internet engineering task force) issue RFC in 2011
(Request For Comments, request for comments) 6146 and RFC6147, redesigns a new solution NAT64
(Network Address and Protocol Translation from IPv6Clients to IPv4Servers, by
Network address translation of the IPv6 clients to the subsidiary protocol conversion of IPv4 servers) and DNS64 (DNS Extensions for
Network Address Translation from IPv6Clients to IPv4Servers, are applicable NAT64 extension field
Name system) technology.
Currently, IPv6 and IPv4 technology co-existences are in internet, and the most contents in internet only can to IPv4
With, but IPv6 user needs also exist for access IPv4 contents, and this is realized by NAT64 and correlation technique.
NAT64 is a kind of stateful network address and protocol conversion technology, general only support IPv6 network side user hairs
Play connected reference IPv4 sides Internet resources.But NAT64 also supports manual configuration static mappings relation, IPv4 networks actively hair is realized
Play connected reference IPv6 networks.NAT64 technologies realize the mutual phase transformation between IPv6 bags and IPv4 bags.NAT64 can realize TCP
(Transmission Control Protocol, transmission control protocol), UDP (User Data Protocol, user data
Datagram protocol), under ICMP (Internet Control Message Protocol, Internet Control Message Protocol) agreement
IPv6 and the IPv4 network address and protocol conversion.NAT64 typically cooperates with DNS64, it is not necessary in IPv6 clients or
IPv4 server ends make any modification.
The shortcoming of tunneling technique is to need extra tunnel configuration, inefficiency；NAT-PT resource consumption is larger, seriously
Influence the runnability of equipment.
The content of the invention
The invention aims to overcome the shortcomings of above-mentioned background technology there is provided one kind based on NAT64 to realize IPv4 nets
Network and the system and method for IPv6 network interworkings, can lead on product in existing number and intactly realize NAT64 correlation functions, have simultaneously
Effect reduces the loss of equipment performance and the use of system resource, improves operating efficiency, to equipment runnability or network environment not
Have undesirable effect.
The present invention provides a kind of system that IPv4 networks and IPv6 network interworkings are realized based on NAT64, including NAT64 moulds
Block, network management interface, bottom data transceiver interface and configuration data sync cap, the NAT64 modules respectively with network management interface, bottom
Layer data transceiver interface is connected with configuration data sync cap, and the NAT64 modules include NAT64 configurations submodule, dynamic table
Submodule and IPv4/IPv6 messages forwarding submodule are safeguarded in foundation, and NAT64 configuration submodules are set up with dynamic table safeguards submodule
It is connected, dynamic table, which is set up, safeguards that submodule is connected with IPv4/IPv6 messages forwarding submodule；NAT64 configurations submodule, dynamic table
Foundation safeguards that submodule is connected with network management interface, and dynamic table is set up and safeguards that submodule is also connected with configuration data sync cap,
IPv4/IPv6 messages forwarding submodule, configuration data sync cap are connected with bottom data transceiver interface；
The NAT64 configurations submodule is used for：Carry out global configuration and the interface configuration of NAT64 functions；
The dynamic table is set up and safeguards that submodule is used for：Dynamic address mapping table is set up and safeguards, when producing new session
Mapping is created, mapping is safeguarded in a session, mapping is deleted after the session is completed；
The IPv4/IPv6 messages forwarding submodule is used for：NAT64 address translation and association is carried out to the message received
View translation, then the message after NAT64 address translation and protocol translation is forwarded from correct interface.
On the basis of above-mentioned technical proposal, the NAT64 configurations submodule carries out the global configuration of NAT64 functions and connect
Mouth configuration includes：NAT64 functions are enabled, IPv6 changes prefix, static address mapping table, IPv4 address pools and its enable, maximum
Session number.
On the basis of above-mentioned technical proposal, the NAT64 modules possess an IPv6 address pool and an IPv4 address
Pond, IPv6 address pools are used in IPv6 networks represent IPv4 addresses, and IPv4 address pools are used to represent IPv6 in IPv4 networks
Address；Represent that the IPv6 addresses of IPv4 addresses are made up of three parts in IPv6 networks：IPv6 prefixes, the IPv4 being embedded into
Location and variable-length suffix.
On the basis of above-mentioned technical proposal, the IPv6 address pools include one or more IPv6 prefixes.
On the basis of above-mentioned technical proposal, the IPv6 prefixes mainly include three characteristics：
(1) prefix index value：Data type is 16bit unsigned ints, is entered in address translation by prefix index value
Row selection is used；
(2) prefix：IPv6 prefixes are stored with array form；
(3) prefix length：Variable prefix length.
On the basis of above-mentioned technical proposal, the prefix length is 32,40,48,56,64 or 96.
On the basis of above-mentioned technical proposal, the IPv4 address pools are by the continuous IP v4 addresses structure under same subnet section
Into except the situation of static manual configuration, address of cache is all dynamic, and takes IPv6 transmission ground in actual applications
The mapping of address is transmitted to IPv4 in location；The IPv4 address pools mainly include：(1) address pool index value；(2) starting ip v4
Location, termination IPv4 addresses and subnet mask；(3) single IPv4 addresses are common to the quantity of session simultaneously；(4) TCP, UDP meeting
The port numbers of words and ICMP identifier.
On the basis of above-mentioned technical proposal, the IPv4/IPv6 messages forward submodule defined in dual stack stack
The structure on the various heads needed for translation, mainly including following several：
struct ip6_hdr：Represent IPv6 heads；
struct ip6_frag：Represent IPv6 bursts head；
struct icmp6_hdr：Represent ICMPv6 heads；
struct ip：Represent IPv4 heads；
struct ippseudo：Represent the pseudo- heads of IPv4 for Transmission Control Protocol；
struct icmp2_hdr：Represent ICMPv4 heads.
The present invention is also provided a kind of realizes IPv4 networks and IPv6 network interworkings suitable for said system based on NAT64
Method, comprises the following steps：
A, ensure NAT64 modules connection IPv4 networks and IPv6 networks, realize that the global of NAT64 functions is enabled and interface makes
Energy；
B, NAT64 module receive the data message that network side is sent, according to the protocol version of data message, update dynamic table
The address mapping information for safeguarding submodule is set up, the address five-tuple after translation is obtained：IPv4/IPv6 messages forwarding submodule is sentenced
Whether the data message that disconnecting is received is new session, if data message is the new session of IPv4 protocol versions and reflected without static address
Presence is penetrated, IPv4/IPv6 messages forwarding submodule directly abandons the data message；If data message is new for IPv6 protocol versions
Session, dynamic table, which is set up, safeguards that submodule creates a new address of cache；When data message is non-new session, IPv4/
IPv6 messages forward submodule according to already present address mapping table, and the source for receiving data message is transmitted into address and purpose is transmitted
Form of the address conversion into corresponding another protocol version in mapping table；
C, NAT64 module carry out protocol translation to IPv4 headers and IPv6 headers：
When IPv4/IPv6 messages forwarding submodule receives one by the packet of IPv4 network destined IPv6 networks,
IPv4 heads can be translated as IPv6 heads by IPv4/IPv6 messages forwarding submodule, and initial IP v4 heads are removed and replaced into
One IPv6 head；If the transport layer protocol of message is the IPv4/IPv6 messages, forwarding submodule is supported, the school of transport layer
Re-computation is tested and carries out, the data field of bag is without modification；
When IPv4/IPv6 messages forward submodule receive be a destination be IPv4 networks IPv6 packets when,
IPv4/IPv6 messages forwarding submodule needs IPv6 heads being translated as IPv4 heads, and initial IP v6 heads will be removed and replace
Change a new IPv4 head into；ICMPv6, TCP, UDP and datagram congestion control protocol DCCP heads all include verification
With, if mapping address algorithm is not verification and neutral, the value of verification sum is calculated before translation, and to ICMP and transmission
Layer head is updated；
For TCP and UDP messages, IP heads are only translated；To icmp packet, translation IP and ICMP heads；If address translation is calculated
The non-verification of method and neutrality, then be the transport layer header of 0 UDP messages to the TCP containing pseudo- head, icmp packet and verification and not
Portion carries out re-computation and renewal；If message is fragment message, the respective handling of fragment message is carried out；
D, IPv4/IPv6 message forward submodule to complete the new data message of address translation and protocol translation according to purpose
Address is forwarded.
On the basis of above-mentioned technical proposal, step A comprises the following steps：NAT64 configuration submodules carry out NAT64 functions
Global configuration and interface configuration：NAT64 functions enable, IPv6 conversion prefix, static address mapping table, IPv4 address pools and its
Enable, max-session number.
Compared with prior art, advantages of the present invention is as follows：
The present invention combines the hardware platform resource situation and software platform characteristic that existing number leads to product, can be in the logical production of existing number
NAT64 correlation functions are intactly realized on product, while effectively reducing the loss of equipment performance and the use of system resource, work are improved
Make efficiency, equipment runnability or network environment are not had undesirable effect.
Brief description of the drawings
Fig. 1 is based on NAT64 to realize IPv4 networks and the structural frames of the system of IPv6 network interworkings in the embodiment of the present invention
Figure.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
Shown in Figure 1, offer of the embodiment of the present invention is a kind of to realize IPv4 networks and IPv6 network interworkings based on NAT64
System, including NAT64 modules, network management interface, bottom data transceiver interface and configuration data sync cap, NAT64 modules difference
It is connected with network management interface, bottom data transceiver interface and configuration data sync cap, NAT64 modules and network management interface, bottom number
Cooperated according to transceiver interface and configuration data sync cap, complete NAT64 functions could be realized on datacom device.
NAT64 modules include NAT64 configurations submodule, dynamic table foundation and safeguard submodule and the forwarding of IPv4/IPv6 messages
Submodule, NAT64 configures submodule and safeguards that submodule is connected with dynamic table foundation, and dynamic table is set up and safeguards submodule and IPv4/
IPv6 messages forwarding submodule is connected.NAT64 configurations submodule, dynamic table are set up and safeguard that submodule is connected with network management interface,
Dynamic table is set up and safeguards that submodule is also connected with configuration data sync cap, IPv4/IPv6 messages forwarding submodule, configuration data
Sync cap is connected with bottom data transceiver interface.
NAT64 configuration submodules are used for：Carry out global configuration and the interface configuration of NAT64 functions：NAT64 functions enable,
IPv6 conversions prefix, static address mapping table, IPv4 address pools and its enable, max-session number etc., NAT64 functions are in the overall situation
It is required for enabling under lower and interface.
Dynamic table is set up and safeguards that submodule is used for：Dynamic address mapping table is set up and safeguarded, is created when producing new session
Mapping, safeguards mapping in a session, and mapping is deleted after the session is completed.
IPv4/IPv6 messages forwarding submodule is used for：The address translation and agreement that the message received carries out NAT64 are turned over
Translate, then the message after NAT64 address translation and protocol translation is forwarded from correct interface.IPv4/IPv6 messages are forwarded
Submodule is the key components for realizing IPv4 networks and IPv6 network services.
In order to create address of cache, NAT64 modules, which must possess an IPv6 address pool, (to be used to represent in IPv6 networks
IPv4 addresses) and an IPv4 address pool (being used to represent IPv6 addresses in IPv4 networks).
Represent that the IPv6 addresses of IPv4 addresses are made up of three parts in IPv6 networks：IPv6 prefixes, it is embedded into
IPv4 addresses and variable-length suffix (suffix is typically set to 0).
IPv6 address pools include one or more IPv6 prefixes.
IPv6 prefixes mainly include three characteristics：
(1) prefix index value：Data type is 16bit unsigned ints, and prefix index value may have multiple, be turned in address
Selection is carried out when translating by prefix index value to use；
(2) prefix：IPv6 prefixes, prefix up to 96 are stored with array form；
(3) prefix length：Variable prefix length, prefix length can for 32,40,48,56,64 or 96.
IPv4 address pools are generally made up of the continuous IP v4 addresses under same subnet section.Because IPv4 address spaces are sharp
Subtract, IPv4 address pool very littles, it is impossible to set up the one-to-one mapping with IPv6 addresses.Therefore, except the situation of static manual configuration,
Address of cache is all dynamic, and takes IPv6 to transmit the mapping that address transmits address to IPv4 in actual applications,
That is, IP address and port numbers will participate in translation.
IPv4 address pools mainly include：(1) address pool index value；(2) starting ip v4 addresses, termination IPv4 addresses and son
Net mask；(3) single IPv4 addresses are common to the quantity of session simultaneously；(4) port numbers of TCP, UDP session and ICMP mark
Symbol.
IPv4/IPv6 messages forwarding submodule translates the structure on required various heads defined in dual stack stack,
Mainly include following several：
struct ip6_hdr：Represent IPv6 heads；
struct ip6_frag：Represent IPv6 bursts head；
struct icmp6_hdr：Represent ICMPv6 heads；
struct ip：Represent IPv4 heads；
struct ippseudo：Represent the pseudo- heads of IPv4 for Transmission Control Protocol；
struct icmp2_hdr：Represent ICMPv4 heads.
Offer of the embodiment of the present invention is a kind of to realize that IPv4 networks and IPv6 networks are mutual suitable for said system based on NAT64
Logical method, comprises the following steps：
A, ensure NAT64 modules connection IPv4 networks and IPv6 networks, realize that the global of NAT64 functions is enabled and interface makes
Energy.NAT64 modules connect IPv4 or IPv6 networks, not only need to enable NAT64 functions in the overall situation, in addition it is also necessary in operation NAT64
The interface of function enables NAT64 functions.NAT64 configuration submodules carry out global configuration and the interface configuration of NAT64 functions：
NAT64 functions are enabled, IPv6 conversions prefix, static address mapping table, IPv4 address pools and its enable, max-session number etc..
B, NAT64 module receive the data message that network side is sent, according to the protocol version of data message, update dynamic table
The address mapping information for safeguarding submodule is set up, the address five-tuple after translation is obtained.
IPv4/IPv6 messages forwarding submodule judges whether the data message received is new session, if data message is
The new session of IPv4 protocol versions and without static address map exist, IPv4/IPv6 messages forwarding submodule directly abandon the number
According to message；If data message is the new session of IPv6 protocol versions, dynamic table, which is set up, safeguards that submodule creates a new address
Mapping；When data message is non-new session, IPv4/IPv6 messages forward submodule according to already present address mapping table, will
Receive source transmission address (source IP address and source port number) and purpose transmission address (purpose IP address and the destination of data message
Slogan) it is converted into the form of corresponding another protocol version in mapping table.
C, NAT64 module carry out protocol translation to IPv4 headers and IPv6 headers.
At present, NAT64 modules support unicast UDP, TCP and icmp packet communication.
When IPv4/IPv6 messages forwarding submodule receives one by the packet of IPv4 network destined IPv6 networks,
IPv4 heads can be translated as IPv6 heads by IPv4/IPv6 messages forwarding submodule.Initial IP v4 heads are removed and replaced into
One IPv6 head.If the transport layer protocol of message is the IPv4/IPv6 messages, forwarding submodule is supported, then transport layer
Verification and re-computation may be needed.The data field of bag is without modification.
When IPv4/IPv6 messages forward submodule receive be a destination be IPv4 networks IPv6 packets when,
IPv4/IPv6 messages forwarding submodule needs IPv6 heads being translated as IPv4 heads.Initial IP v6 heads will be removed and replace
Change a new IPv4 head into.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 include verification and, therefore, if mapping address algorithm be not verification and neutrality,
The value of verification sum must be calculated before translation, and ICMP and transport layer header are updated.
Ordinary circumstance, IP need to be only translated for TCP and UDP messages, to icmp packet, not only need to translate IP
Head, while should also translate ICMP heads.
If in addition, the non-verification of address translation algorithm and neutrality, to the TCP containing pseudo- head, icmp packet and verification
The transport layer header for 0 UDP messages does not carry out re-computation and renewal.
If message is fragment message, the respective handling of fragment message is carried out.
D, IPv4/IPv6 message forward submodule to complete the new data message of address translation and protocol translation according to purpose
Address is forwarded.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these modifications and change
Type is within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content not being described in detail in specification is known to the skilled person.
Claims (10)
1. a kind of system that IPv4 networks and IPv6 network interworkings are realized based on NAT64, including NAT64 modules, network management interface, bottom
Layer data transceiver interface and configuration data sync cap, the NAT64 modules respectively with network management interface, bottom data transceiver interface
It is connected with configuration data sync cap, it is characterised in that：The NAT64 modules include NAT64 configurations submodule, dynamic table and set up
Submodule and IPv4/IPv6 messages forwarding submodule are safeguarded, NAT64 configures submodule and safeguards submodule phase with dynamic table foundation
Even, dynamic table, which is set up, safeguards that submodule is connected with IPv4/IPv6 messages forwarding submodule；NAT64 configurations submodule, dynamic table are built
Vertical to safeguard that submodule is connected with network management interface, dynamic table is set up and safeguards that submodule is also connected with configuration data sync cap,
IPv4/IPv6 messages forwarding submodule, configuration data sync cap are connected with bottom data transceiver interface；
The NAT64 configurations submodule is used for：Carry out global configuration and the interface configuration of NAT64 functions；
The dynamic table is set up and safeguards that submodule is used for：Dynamic address mapping table is set up and safeguarded, is created when producing new session
Mapping, safeguards mapping in a session, and mapping is deleted after the session is completed；
The IPv4/IPv6 messages forwarding submodule is used for：NAT64 address translation and association is carried out to the data message received
View translation, then the data message after NAT64 address translation and protocol translation is forwarded from correct interface；
When the system is based on realizing IPv4 networks with IPv6 network interworkings, it is used for：
Ensure NAT64 modules connection IPv4 networks and IPv6 networks, realize that the global of NAT64 functions is enabled and interface enable；
NAT64 modules receive the data message that network side is sent, according to the protocol version of data message, update dynamic table and set up dimension
The address mapping information of submodule is protected, the address five-tuple after translation is obtained：IPv4/IPv6 messages forwarding submodule judges to receive
To data message whether be new session, if data message for IPv4 protocol versions new session and without static address mapping deposit
The data message is directly abandoned in, IPv4/IPv6 messages forwarding submodule；If data message is the new meeting of IPv6 protocol versions
Words, dynamic table, which is set up, safeguards that submodule creates a new address of cache；When data message is non-new session, IPv4/IPv6
Message forwards submodule according to already present address mapping table, and the source for receiving data message is transmitted into address and purpose transmits address
It is converted into the form of corresponding another protocol version in mapping table；
NAT64 modules carry out protocol translation to IPv4 headers and IPv6 headers：
When IPv4/IPv6 messages forwarding submodule receives one by the data message of IPv4 network destined IPv6 networks, IPv4/
IPv4 heads can be translated as IPv6 heads by IPv6 messages forwarding submodule, and initial IP v4 heads are removed and replaced into one
IPv6 heads；If the transport layer protocol of data message is the IPv4/IPv6 messages, forwarding submodule is supported, the school of transport layer
Re-computation is tested and carries out, the data field of data message is without modification；
When IPv4/IPv6 messages forward submodule receive be a destination be IPv4 networks IPv6 data messages when,
IPv4/IPv6 messages forwarding submodule needs IPv6 heads being translated as IPv4 heads, and initial IP v6 heads will be removed and replace
Change a new IPv4 head into；ICMPv6, TCP, UDP and datagram congestion control protocol DCCP heads all include verification
With, if mapping address algorithm is not verification and neutral, the value of verification sum is calculated before translation, and to ICMP and transmission
Layer head is updated；
For TCP and UDP message message, IP heads are only translated；To ICMP data messages, translation IP and ICMP heads；If address is turned over
The non-verification of algorithm and neutrality are translated, then is 0 UDP datagram to TCP, ICMP data message containing pseudo- head and verification and not
The transport layer header of text carries out re-computation and renewal；If data message is fragment data message, fragment data message is carried out
Respective handling；
IPv4/IPv6 messages forward submodule to turn the new data message for completing address translation and protocol translation according to destination address
Send out.
2. the system as claimed in claim 1 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
The global configuration and interface configuration that the NAT64 configurations submodule carries out NAT64 functions are included：NAT64 functions are enabled, IPv6 turns
Change prefix, static address mapping table, IPv4 address pools and its enable, max-session number.
3. the system as claimed in claim 1 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
The NAT64 modules possess an IPv6 address pool and an IPv4 address pool, and IPv6 address pools are used for the table in IPv6 networks
Show IPv4 addresses, IPv4 address pools are used to represent IPv6 addresses in IPv4 networks；IPv4 addresses are represented in IPv6 networks
IPv6 addresses are made up of three parts：IPv6 prefixes, the IPv4 addresses being embedded into and variable-length suffix.
4. the system as claimed in claim 3 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
The IPv6 address pools include one or more IPv6 prefixes.
5. the system as claimed in claim 3 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
The IPv6 prefixes include three characteristics：
(1) prefix index value：Data type is 16bit unsigned ints, is selected in address translation by prefix index value
Select and use；
(2) prefix：IPv6 prefixes are stored with array form；
(3) prefix length：Variable prefix length.
6. the system as claimed in claim 5 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
The prefix length is 32,40,48,56,64 or 96.
7. the system as claimed in claim 3 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
The IPv4 address pools are made up of the continuous IP v4 addresses under same subnet section, except the situation of static manual configuration, address
Mapping is all dynamic, and takes IPv6 to transmit the mapping that address transmits address to IPv4 in actual applications；It is described
IPv4 address pools include：(1) address pool index value；(2) starting ip v4 addresses, termination IPv4 addresses and subnet mask；(3) it is single
Individual IPv4 addresses are common to the quantity of session simultaneously；(4) port numbers of TCP, UDP session and ICMP identifier.
8. the system as claimed in claim 1 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
The IPv4/IPv6 messages forwarding submodule translates the structure on required various heads defined in dual stack stack, including
It is several below：
struct ip6_hdr：Represent IPv6 heads；
struct ip6_frag：Represent IPv6 bursts head；
struct icmp6_hdr：Represent ICMPv6 heads；
struct ip：Represent IPv4 heads；
struct ippseudo：Represent the pseudo- heads of IPv4 for Transmission Control Protocol；
struct icmp2_hdr：Represent ICMPv4 heads.
9. IPv4 networks and IPv6 network interworkings are realized based on NAT64 suitable for system any one of claim 1 to 8
Method, it is characterised in that comprise the following steps：
A, ensure NAT64 modules connection IPv4 networks and IPv6 networks, realize that the global of NAT64 functions is enabled and interface is enabled；
B, NAT64 module receive the data message that network side is sent, according to the protocol version of data message, update dynamic table and set up
The address mapping information of submodule is safeguarded, the address five-tuple after translation is obtained：IPv4/IPv6 messages forwarding submodule judges to connect
Whether the data message received is new session, if data message is the new session of IPv4 protocol versions and deposited without static address mapping
The data message is directly abandoned in, IPv4/IPv6 messages forwarding submodule；If data message is the new meeting of IPv6 protocol versions
Words, dynamic table, which is set up, safeguards that submodule creates a new address of cache；When data message is non-new session, IPv4/IPv6
Message forwards submodule according to already present address mapping table, and the source for receiving data message is transmitted into address and purpose transmits address
It is converted into the form of corresponding another protocol version in mapping table；
C, NAT64 module carry out protocol translation to IPv4 headers and IPv6 headers：
When IPv4/IPv6 messages forwarding submodule receives one by the data message of IPv4 network destined IPv6 networks, IPv4/
IPv4 heads can be translated as IPv6 heads by IPv6 messages forwarding submodule, and initial IP v4 heads are removed and replaced into one
IPv6 heads；If the transport layer protocol of data message is the IPv4/IPv6 messages, forwarding submodule is supported, the school of transport layer
Re-computation is tested and carries out, the data field of data message is without modification；
When IPv4/IPv6 messages forward submodule receive be a destination be IPv4 networks IPv6 data messages when,
IPv4/IPv6 messages forwarding submodule needs IPv6 heads being translated as IPv4 heads, and initial IP v6 heads will be removed and replace
Change a new IPv4 head into；ICMPv6, TCP, UDP and datagram congestion control protocol DCCP heads all include verification
With, if mapping address algorithm is not verification and neutral, the value of verification sum is calculated before translation, and to ICMP and transmission
Layer head is updated；
For TCP and UDP message message, IP heads are only translated；To ICMP data messages, translation IP and ICMP heads；If address is turned over
The non-verification of algorithm and neutrality are translated, then is 0 UDP datagram to TCP, ICMP data message containing pseudo- head and verification and not
The transport layer header of text carries out re-computation and renewal；If data message is fragment data message, fragment data message is carried out
Respective handling；
D, IPv4/IPv6 message forward submodule to complete the new data message of address translation and protocol translation according to destination address
Forward.
10. the method as claimed in claim 9 that IPv4 networks and IPv6 network interworkings are realized based on NAT64, it is characterised in that：
Step A comprises the following steps：NAT64 configuration submodules carry out global configuration and the interface configuration of NAT64 functions：NAT64 functions
Enable, IPv6 changes prefix, static address mapping table, IPv4 address pools and its enable, max-session number.
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| CN201410444590.7A CN104270475B (en) | 2014-09-03 | 2014-09-03 | The system and method for IPv4 networks and IPv6 network interworkings is realized based on NAT64 |
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| CN107682472A (en) * | 2017-10-24 | 2018-02-09 | 睿哲科技股份有限公司 | IPv4 and IPv6 interoperability methods, apparatus and system based on RTSP reverse proxys |
| CN107835198B (en) * | 2017-12-13 | 2020-11-24 | 睿哲科技股份有限公司 | Method and device for PPTP traversal in IPv4-IPv6 intercommunication scene and electronic equipment |
| CN109218219A (en) * | 2018-10-15 | 2019-01-15 | 迈普通信技术股份有限公司 | A kind of load-balancing method, device, the network equipment and storage medium |
| CN109688240A (en) * | 2018-12-24 | 2019-04-26 | 睿哲科技股份有限公司 | IPv4 multicast and the mutual phase changing device of IPv6 multicast and equipment |
| CN112261054B (en) * | 2020-10-23 | 2022-07-15 | 重庆邮电大学 | Ethernet/IP and IPv6 protocol conversion system and method based on application service quality of service |
| CN112532641B (en) * | 2020-12-07 | 2023-04-28 | 四川光慧新能源科技有限公司 | Communication method for connecting internal modules of charging pile |
| CN113630378B (en) * | 2021-06-29 | 2022-08-19 | 清华大学 | IPv6 network access source address verification deployment measurement method and device based on ICMP speed limit |
| CN113783974B (en) * | 2021-09-09 | 2023-06-13 | 烽火通信科技股份有限公司 | Method and device for dynamically issuing MAP domain rule |
| CN113746954B (en) * | 2021-09-22 | 2023-06-13 | 烽火通信科技股份有限公司 | Method and device for quickly recovering NAT address block through secondary allocation |
| CN113923188B (en) * | 2021-12-08 | 2022-03-08 | 北京英迪瑞讯网络科技有限公司 | Stateless flexible mapping algorithm for IPv6/IPv4 access |
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