CN106713528B - A kind of method of home gateway and IPv6 host access network server - Google Patents
A kind of method of home gateway and IPv6 host access network server Download PDFInfo
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- CN106713528B CN106713528B CN201710154697.1A CN201710154697A CN106713528B CN 106713528 B CN106713528 B CN 106713528B CN 201710154697 A CN201710154697 A CN 201710154697A CN 106713528 B CN106713528 B CN 106713528B
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- connection request
- address
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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
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
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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 invention discloses a kind of methods of home gateway and IPv6 host access network server, are related to network communication technology field.Home gateway includes DNS64 module, routing module and NAT module；DNS64 module is used to the analysis request for the network server domain name that IPv6 host issues being transmitted to dns server, when the corresponding IP address of domain name that dns server returns is the address IPv4, the corresponding IP address of domain name is synthesized into the address IPv6 and is sent to IPv6 host；Routing module is used to for the second connection request that NAT module carries out network address translation acquisition to the first connection request being forwarded to network server, and the response message for the second connection request that network server returns is forwarded to IPv6 host after NAT module is converted into the response message of the first connection request.The present invention realizes IPv6 host access IPv6 Internet resources and IPv4 Internet resources.
Description
The present invention relates to network communication technology field, it is specifically related to a kind of home gateway and IPv6 host access network clothes
The method of business device.
Background technique
Home gateway (Residential Gateway) be in-home network information equipment and Smart Broadband Access Network it
Between intelligent gateway, home gateway includes network side and user side, and network side is from Internet Service Provider (Internet
Service Provider, ISP) internet address is obtained, and available network address is distributed for user side.With internet protocol
The exhaustion and personal device for discussing edition 4 (Internet Protocol Version 4, IPv4) available address access network demand
Sharp increase, more and more personal devices start to support to dispose pure IPv6 (Internet in the user side of home gateway
Protocol Version 6) local area network, personal device become only support IPv6 protocol stack IPv6 host, can directly access
Support the IPv6 network server of IPv6 protocol stack.But current more IPv4 network server still uses the address IPv4
IPv4 protocol stack is only supported in access, since IPv6 host and IPv4 network server run different internet protocol versions
It cannot be directly connected to, relative to network side IPv4 network server abundant, Customer Premises Network is isolated IPv6 site.
In order to realize that IPv6 host accesses IPv4 Internet resources, a kind of scheme generallyd use at present is by IPv6
IPv4/IPv6 dual stack is run on host to solve, the two multiple operation is non-interference, and this scheme requires IPv6 host
Also it supports IPv4 protocol stack, is not suitable for the network deployment request of user, therefore, also develops based on IPv6 to IPv4 at present
Network address translation (Network Address Translation IPv6-IPv4, NAT64) and IPv6 and IPv4 domain name system
The NAT64/DNS64 technical solution of (Domain Name System IPv6-IPv4, the DNS64) technology of system, wherein DNS64 root
The address IPv6 that IPv6 host uses is synthesized according to the address IPv4 of IPv4 network server, IPv6 of the NAT64 based on synthesis
Location executes address conversion and protocol conversion, and this scheme often relies on ISP and supports NAT64, and need to home gateway with
Outer other facilities are modified, and network upgrade difficulty and increased costs are caused.
Summary of the invention
In view of the deficiencies in the prior art, the main purpose of the present invention is to provide a kind of home gateway, the present invention
Another object be to provide the method for IPv6 host access network server a kind of, can be realized home gateway user side
IPv6 host can access IPv6 Internet resources, can also access IPv4 Internet resources, without to its other than home gateway
Its facility carries out any modification.
The present invention provides a kind of home gateway, and home gateway includes DNS64 module, routing module and NAT module；
DNS64 module is used to send routing module for the analysis request for the network server domain name that IPv6 host issues,
And the response message for the analysis request that dns server returns is received from routing module, when the corresponding IP address of domain name
When for the address IPv4, the corresponding IP address of domain name is synthesized into the address IPv6 and is sent to IPv6 host；
Routing module is used to forward the analysis request and its response message between DNS64 module and dns server；When
When determining IPv6 address of the purpose IP address for the first connection request that IPv6 host issues for synthesis, by NAT module to described
The second connection request that first connection request carries out network address translation acquisition is forwarded to network server, and by network server
The response message of second connection request returned is after NAT module is converted into the response message of first connection request
It is forwarded to IPv6 host；
NAT module is used for according to preset network address translation NAT rule, with carrying out network to first connection request
The second connection request is obtained after the conversion of location, obtains institute after carrying out network address translation to the response message of second connection request
State the response message of the first connection request, the network address of second connection request be include the corresponding IP address of domain name
The publicly-owned address IPv4.
Based on the above technical solution, the NAT module includes NAT64 unit and NAT44 unit；
NAT64 unit is used to be sent to NAT44 unit after first connection request is converted to privately owned connection request, with
And routing mould is forwarded to after the response message of the privately owned connection request to be converted to the response message of first connection request
Block, wherein the network address in the privately owned connection request is the address IPv6 host corresponding private ip v4；
NAT44 unit is for being forwarded to routing mould after the privately owned connection request is converted to second connection request
Block, and be sent to after the response message of second connection request to be converted to the response message of the privately owned connection request
NAT64 unit.
Based on the above technical solution, when the corresponding IP address of domain name is the address IPv6, routing module is also
For forwarding first connection request and its response message between IPv6 host and network server.
Based on the above technical solution, the preset network address translation NAT rule includes before converting and converting
The corresponding relationship and conversion direction of network address afterwards, the network address of the pre- and post-conversion include IP address and
Port numbers.
The method for the IPv6 host access network server that the present invention also provides a kind of based on the home gateway comprising
Following steps:
The analysis request for the network server domain name that IPv6 host issues is transmitted to dns server by DNS64 module, when
When the corresponding IP address of domain name that dns server returns is the address IPv4, the corresponding IP address of domain name is synthesized
The address IPv6 is simultaneously sent to IPv6 host；
When the purpose IP address for the first connection request that IPv6 host issues is the address IPv6 of synthesis, routing module will
The second connection request that NAT module carries out network address translation acquisition to first connection request is forwarded to network server,
And the response message for second connection request that network server returns is converted into first connection by NAT module and is asked
Be forwarded to IPv6 host after the response message asked, the network address of second connection request be include the corresponding IP of domain name
The publicly-owned address IPv4 of address.
Based on the above technical solution, NAT module is carried out network to first connection request by routing module
The second connection request that location conversion obtains is forwarded to network server, and second connection request that network server is returned
Response message be forwarded to IPv6 host after NAT module is converted into the response message of first connection request and include:
Routing module receives the first connection request that IPv6 host issues；
When determining IPv6 address of the purpose IP address of first connection request for synthesis, first connection is asked
It asks and is sent to NAT module；
NAT module is sent to routing module after first connection request is converted to the second connection request；
Second connection request is forwarded to network server by routing module；
The response message for second connection request that network server returns is sent back NAT module by routing module；
After the response message of second connection request is converted to the response message of first connection request by NAT module
It is sent to routing module；
The response message of first connection request is forwarded to IPv6 host by routing module.
Based on the above technical solution, the method also includes: when the corresponding IP address of domain name for IPv6
When location, routing module forwards first connection request and its response message between IPv6 host and network server.
Based on the above technical solution, the preset network address translation NAT rule includes before converting and converting
The corresponding relationship and conversion direction of network address afterwards, the network address of the pre- and post-conversion include IP address and
Port numbers.
Based on the above technical solution, the preset network address translation NAT rule includes first network address
NAT rule and the second network address translation NAT rule are converted,
First connection request is converted to privately owned connection request by the first network address conversion NAT rule, and
The response message of the privately owned connection request is converted to the response message of second connection request, wherein the privately owned company
The network address for connecing request is the address IPv6 host corresponding private ip v4；
The privately owned connection request is converted to second connection request by the second network address translation NAT rule,
And the response message of second connection request is converted to the response message of the privately owned connection request.
Based on the above technical solution, the NAT module includes NAT64 unit and NAT44 unit；
NAT64 unit is sent to NAT44 unit after first connection request is converted to privately owned connection request, and will
The response message of the privately owned connection request is forwarded to routing module after being converted to the response message of first connection request；
NAT44 unit is forwarded to routing module after the privately owned connection request is converted to second connection request, with
And the response message of second connection request is converted to to be sent to NAT64 after the response message of the privately owned connection request mono-
Member.
Compared with prior art, advantages of the present invention is as follows:
(1) realize that the IPv6 host of home gateway user side can access IPv6 Internet resources, it is mutual also to access IPv4
Networked resources reduce complexity, the upgrading difficulty of network side without carrying out any modification to other facilities other than home gateway
And cost, also reduce network operation difficulty and workload.
(2) on the basis of the routing module of original home gateway and NAT44 unit, by increase DNS64 module and
The function of access IPv6 and IPv4 Internet resources can be realized in the software upgrading mode of NAT64 unit, and is convenient for switching
Control, reduces the complexity, upgrading difficulty and cost of routing, and simplifies network fault diagnosis.
(3) in the case where realizing access IPv4 network server, it is ensured that IPv6 host accesses IPv6 network server
Transmission speed promotes user experience.
Detailed description of the invention
Fig. 1 is the system schematic of home gateway of the embodiment of the present invention；
Fig. 2 is the method flow diagram of IPv6 host of embodiment of the present invention access network server；
Fig. 3 is the flow chart of step S4 in Fig. 2；
Fig. 4 is the message interaction schematic diagram of the IPv6 host access IPv4 network server of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of home gateway, IPv6 host by home gateway respectively with
The network server that IPv6 host requests access to is connected with dns server, and dns server sends network server to home gateway
The address IPv6 IPv4.Home gateway includes DNS64 module, routing module and NAT module.
DNS64 module is used to send routing module for the analysis request for the network server domain name that IPv6 host issues,
And from routing module receive dns server return analysis request response message, when the corresponding IP address of domain name for IPv4
When location, for example, it includes that A is recorded that the corresponding IP address of domain name, which is in A:example.com, the corresponding IP address of domain name is synthesized
The address IPv6 is simultaneously sent to IPv6 host.
Domain name mapping request includes the domain address for the network server that IPv6 host requests access to, according to analysis request
Response message, obtains IP address corresponding with the domain name, which is the address IPv6 or the address IPv4.DNS64 module
The address IPv6 is synthesized based on the address IPv4 and scheduled IPv6 prefix, such as scheduled IPv6 prefix is 2001:db8:ffff.
Routing module is used to forward the analysis request and its response message between DNS64 module and dns server；Work as judgement
When the purpose IP address for the first connection request that IPv6 host issues is the address IPv6 of synthesis, NAT module is connected to first
The second connection request that request carries out network address translation acquisition is forwarded to network server, and that network server is returned
The response message of two connection requests is forwarded to IPv6 host after NAT module is converted into the response message of the first connection request.
Routing module determines that IPv6 host issues according to the scheduled IPv6 prefix that DNS64 module is used to synthesize the address IPv6
The first connection request purpose IP address be synthesis the address IPv6.
When the corresponding IP address of domain name is the address IPv6, for example, the corresponding IP address of domain name is AAAA:
It include that AAAA is recorded in example.com, routing module is also used to forward first between IPv6 host and network server to connect
Connect request and its response message.The embodiment of the present invention can be in the case where realizing access IPv4 network server, it is ensured that IPv6
Host accesses the transmission speed of IPv6 network server, promotes user experience.
When the purpose IP address of first connection request is the address IPv6 of synthesis, NAT module is used for according to preset network
Address conversion NAT rule, obtains the second connection request after carrying out network address translation to the first connection request, asks to the second connection
The response message asked carries out the response message that the first connection request is obtained after network address translation, the network of the second connection request
Location is the publicly-owned address IPv4 for including the corresponding IP address of domain name.
NAT module includes NAT64 unit and NAT44 unit, and NAT64 unit is privately owned for being converted to the first connection request
It is sent to NAT44 unit after connection request, and the response message of privately owned connection request is converted to the sound of the first connection request
Routing module is forwarded to after answering message, wherein the network address in privately owned connection request is the corresponding private ip v4 of IPv6 host
Address.NAT44 unit, which is used to be converted to privately owned connection request, is forwarded to routing module after the second connection request, and by second
The response message of connection request is sent to NAT64 unit after being converted to the response message of privately owned connection request.
The embodiment of the present invention is on the basis of the routing module of original home gateway and NAT44 unit, by increasing DNS64
Module and the software upgrading mode of NAT64 unit can be realized access IPv6 and IPv4 Internet resources function, and convenient for into
Row switch control, reduces the complexity, upgrading difficulty and cost of routing, and simplifies network fault diagnosis.
The IPv6 host that the embodiment of the present invention can be realized home gateway user side can access IPv6 Internet resources,
IPv4 Internet resources can be accessed, without carrying out any modification to other facilities other than home gateway, reduce the complexity of network
Property, upgrading difficulty and cost, also reduce network operation difficulty and workload.
Shown in Figure 2, the embodiment of the present invention provides a kind of method of IPv6 host access network server comprising with
Lower step:
The analysis request for the network server domain name that IPv6 host issues is transmitted to dns server by S1.DNS64 module,
When the corresponding IP address of domain name that dns server returns is the address IPv4, with synthesizing IPv6 by the corresponding IP address of domain name
Location is simultaneously sent to IPv6 host.
Domain name mapping request includes the domain address for the network server that IPv6 host requests access to, according to analysis request
Response message, obtains IP address corresponding with the domain name, which is the address IPv6 or the address IPv4.DNS64 module
The address IPv6 is synthesized based on the address IPv4 and scheduled IPv6 prefix.
Step S1 is specifically included:
The analysis request for the network server domain name that IPv6 host issues is sent routing module by DNS64 module, routing
Analysis request is transmitted to dns server by module, and the corresponding IP address of domain name that dns server returns is sent back DNS64
The response message of module, the analysis request that DNS64 module is returned according to dns server judged, as the corresponding IP of domain name
When location is the address IPv4, the corresponding IP address of domain name is synthesized into the address IPv6 and is sent to IPv6 host.
S2. routing module receives the first connection request that IPv6 host issues；
S3. routing module judges whether the purpose IP address for the first connection request that IPv6 host issues is the IPv6 synthesized
Address, if so, into S4；If it is not, into S5.
S4. NAT module is carried out the second connection request of network address translation acquisition by routing module to the first connection request
It is forwarded to network server, and the response message for the second connection request that network server returns is converted by NAT module
Be forwarded to IPv6 host after the response message of first connection request, the network address of the second connection request be include that domain name is corresponding
The publicly-owned address IPv4 of IP address.
Specifically, the corresponding IP address of purpose IP address, that is, domain name of the second connection request, the source IP of the second connection request
Address, that is, home gateway IP address, the purpose IP address and source IP address of the second connection request are the address IPv4, i.e. IPv6
When host accesses IPv4 network server, the network side of home gateway is based on IPv4 agreement.
Preset network address translation NAT rule includes the corresponding relationship of the network address of pre- and post-conversion and turns
Direction is changed, the network address of pre- and post-conversion includes IP address and port numbers.
Preset network address translation NAT rule includes that first network address conversion NAT rule and the second network address turn
NAT rule is changed, the first connection request is converted to privately owned connection request by first network address conversion NAT rule, and will be privately owned
The response message of connection request is converted to the response message of the first connection request, wherein the network address of privately owned connection request is
The address IPv6 host corresponding private ip v4.Privately owned connection request is converted to the second company by the second network address translation NAT rule
Request is connect, and the response message of the second connection request is converted to the response message of privately owned connection request.
First network address conversion NAT rule includes a private ip v4 is selected from specified private ip v4 address field
Network address of the location as the corresponding privately owned connection request of IPv6 host, the address private ip v4 with have scheduled IPv6 prefix
The first connection request and its network address of response message there are mapping relations one by one.Second network address translation NAT rule
The network address of network address and the second connection request and its response message including privately owned connection request and its response message it
Between mapping relations.
Table 1 is illustrated to first network address conversion NAT rule and the second network address translation NAT rule.
After privately owned connection request and its response message and conversion after 1: the first connection request of table and its response message, conversion
The second connection request and its response message network address corresponding relationship and conversion direction.
Wherein, for the purpose of network address 1 perhaps source address when network address 2 be corresponding source or destination address, Fig. 4
The message interaction schematic diagram that IPv4 network server is accessed for the IPv6 host of the embodiment of the present invention turns according to first network address
When changing NAT rule the first connection request being converted to privately owned connection request, the destination address of the first connection request includes destination IP
Address and destination slogan: [2001:db8:ffff::10.25.9.10]: 80, wherein according to the corresponding IP address of domain name
10.25.9.10 the synthesized address IPv6 is 2001:db8:ffff::10.25.9.10, the source address packet of the first connection request
Include source IP address and source port number: [2001:db8::2]: 10697.The destination address of privately owned connection request after conversion includes mesh
IP address and destination slogan: 10.25.9.10:80, the source address of the privately owned connection request after conversion include source IP address and
Source port number: 192.168.255.2:20139.The destination address for the connection request that conversion direction is received according to NAT module and source
Address determines, for example, the destination address and source address of the first connection request received according to NAT module, judge that the first connection is asked
Seeking Truth is then converted to the purpose IP address of the first connection request and destination slogan privately owned from IPv6 host-to-network server
The purpose IP address and destination slogan of connection request, the source IP address and source port number of the first connection request are converted to privately owned company
Connect the source IP address and source port number of request.
The destination address of the response message of first connection request includes purpose IP address and destination slogan: [2001:
Db8::2]: 10697, the source address of the first connection request includes source IP address and source port number: [2001:db8:ffff::
10.25.9.10]:80；The destination address of the response message of privately owned connection request after conversion includes purpose IP address and destination
Slogan: 192.168.255.2:20139, the source address of the response message of the privately owned connection request after conversion include source IP address and
Source port number: 10.25.9.10:80.
NAT module includes NAT64 unit and NAT44 unit.NAT64 unit is according to first network address conversion NAT rule
First connection request is converted to and is sent to NAT44 unit after privately owned connection request, and by the response report of privately owned connection request
Text is forwarded to routing module after being converted to the response message of the first connection request.NAT44 unit is according to the second network address translation
Privately owned connection request is converted to and is forwarded to routing module after the second connection request by NAT rule, and by the second connection request
Response message is sent to NAT64 unit after being converted to the response message of privately owned connection request.
NAT64 unit selects an address private ip v4 from specified private ip v4 address field, passes through what is mapped one by one
Mode, will with scheduled IPv6 prefix the first connection request mapping network addresses to the address private ip v4 of selection on,
And mapping relations are saved in mapped file, NAT64 unit carries out the first connection request according to mapped file and its response is reported
The literary network address translation between privately owned connection request and its response message.
The embodiment of the present invention is on the basis of the routing module of original home gateway and NAT44 unit, by increasing DNS64
Module and the software upgrading mode of NAT64 unit can be realized access IPv6 and IPv4 Internet resources function, and convenient for into
Row switch control, reduces the complexity, upgrading difficulty and cost of routing, and simplifies network fault diagnosis.
Shown in Figure 3, step S4 is specifically included:
The first connection request is sent NAT64 unit by S4.1 routing module.
S4.2NAT64 unit is sent to NAT44 unit after the first connection request is converted to privately owned connection request.
S4.3NAT44 unit is forwarded to routing module after privately owned connection request is converted to the second connection request.
Second connection request is forwarded to network server by S4.4 routing module.
The response message for the second connection request that network server returns is sent back NAT44 unit by S4.5 routing module.
S4.6NAT44 unit is sent out after the response message of the second connection request to be converted to the response message of privately owned connection request
It is sent to NAT64 unit.
S4.7NAT64 unit turns after the response message of privately owned connection request to be converted to the response message of the first connection request
It is dealt into routing module.
The response message of first connection request is forwarded to IPv6 host by S4.8 routing module.
S5. the first connection request and its response message between routing module forwarding IPv6 host and network server.
The first connection request that routing module issues IPv6 host is sent to network server, and network server is returned
The response message of the first connection request returned is sent to IPv6 host, when IPv6 host accesses IPv6 network server, home network
The network side of pass is based on IPv6 agreement.
The embodiment of the present invention can be in the case where realizing access IPv4 network server, it is ensured that IPv6 host accesses IPv6
The transmission speed of network server promotes user experience.
The IPv6 host that the embodiment of the present invention can be realized home gateway user side can access IPv6 Internet resources,
IPv4 Internet resources can be accessed, without carrying out any modification to other facilities other than home gateway, reduce the complexity of network
Property, upgrading difficulty and cost, also reduce network operation difficulty and workload.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of home gateway, it is characterised in that: home gateway includes DNS64 module, routing module and NAT module；
DNS64 module is used to send routing module for the analysis request for the network server domain name that IPv6 host issues, and from
Routing module receives the response message for the analysis request that dns server returns, when the corresponding IP address of domain name is
When the address IPv4, the corresponding IP address of domain name is synthesized into the address IPv6 and is sent to IPv6 host；
Routing module is used to forward the analysis request and its response message between DNS64 module and dns server；Work as judgement
When the purpose IP address for the first connection request that IPv6 host issues is the address IPv6 of synthesis, by NAT module to described first
The second connection request that connection request carries out network address translation acquisition is forwarded to network server, and network server is returned
The response message of second connection request forwarded after NAT module is converted into the response message of first connection request
To IPv6 host；
NAT module is used to carry out network address according to preset network address translation NAT rule to first connection request and turn
The second connection request is obtained after changing, and obtain after network address translation described the to the response message of second connection request
The response message of one connection request, the network address of second connection request are the public affairs for including the corresponding IP address of domain name
There is the address IPv4.
2. home gateway as described in claim 1, it is characterised in that: the NAT module includes NAT64 unit and NAT44 mono-
Member；
NAT64 unit is sent to NAT44 unit after being used to be converted to first connection request privately owned connection request, and will
The response message of the privately owned connection request is forwarded to routing module after being converted to the response message of first connection request,
In, the network address in the privately owned connection request is the address IPv6 host corresponding private ip v4；
NAT44 unit is used to be forwarded to routing module after the privately owned connection request is converted to second connection request, with
And the response message of second connection request is converted to to be sent to NAT64 after the response message of the privately owned connection request mono-
Member.
3. home gateway as described in claim 1, it is characterised in that: when the corresponding IP address of domain name is the address IPv6
When, routing module is also used to forward first connection request and its response message between IPv6 host and network server.
4. home gateway as described in any one of claims 1 to 3, it is characterised in that: the preset network address translation NAT
Rule includes the corresponding relationship and conversion direction of the network address of pre- and post-conversion, the net of the pre- and post-conversion
Network address includes IP address and port numbers.
5. a kind of method of the IPv6 host access network server based on home gateway described in claim 1, which is characterized in that
Itself the following steps are included:
The analysis request for the network server domain name that IPv6 host issues is sent routing module, routing module by DNS64 module
The analysis request is transmitted to dns server, when dns server return the corresponding IP address of domain name for IPv4
When location, the corresponding IP address of domain name is synthesized into the address IPv6 and is sent to IPv6 host；
When the purpose IP address for the first connection request that IPv6 host issues be the address IPv6 synthesized, routing module is by NAT
The second connection request that module carries out network address translation acquisition to first connection request is forwarded to network server, and will
The response message for second connection request that network server returns is converted into first connection request by NAT module
Be forwarded to IPv6 host after response message, the network address of second connection request be include the corresponding IP address of domain name
The publicly-owned address IPv4.
6. the method for IPv6 host as claimed in claim 5 access network server, which is characterized in that routing module is by NAT
The second connection request that module carries out network address translation acquisition to first connection request is forwarded to network server, and will
The response message for second connection request that network server returns is converted into first connection request by NAT module
IPv6 host is forwarded to after response message includes:
Routing module receives the first connection request that IPv6 host issues；
When determining IPv6 address of the purpose IP address of first connection request for synthesis, first connection request is sent out
It is sent to NAT module；
NAT module is sent to routing module after first connection request is converted to the second connection request；
Second connection request is forwarded to network server by routing module；
The response message for second connection request that network server returns is sent back NAT module by routing module；
NAT module is sent after the response message of second connection request to be converted to the response message of first connection request
To routing module；
The response message of first connection request is forwarded to IPv6 host by routing module.
7. the method for IPv6 host access network server as claimed in claim 5, which is characterized in that the method is also wrapped
Include: when the corresponding IP address of domain name is the address IPv6, routing module is forwarded between IPv6 host and network server
First connection request and its response message.
8. such as the method for the described in any item IPv6 host access network servers of claim 5 to 7, it is characterised in that: described
Preset network address translation NAT rule includes the corresponding relationship and conversion direction of the network address of pre- and post-conversion,
The network address of the pre- and post-conversion includes IP address and port numbers.
9. the method for IPv6 host access network server as claimed in claim 8, it is characterised in that: the preset network
Address conversion NAT rule includes first network address conversion NAT rule and the second network address translation NAT rule,
First connection request is converted to privately owned connection request by the first network address conversion NAT rule, and by institute
The response message for stating privately owned connection request is converted to the response message of first connection request, wherein the privately owned connection is asked
The network address asked is the address IPv6 host corresponding private ip v4；
The privately owned connection request is converted to second connection request by the second network address translation NAT rule, and
The response message of second connection request is converted to the response message of the privately owned connection request.
10. the method for IPv6 host access network server as claimed in claim 9, it is characterised in that: the NAT module packet
Include NAT64 unit and NAT44 unit；
NAT64 unit is sent to NAT44 unit after first connection request is converted to privately owned connection request, and will be described
The response message of privately owned connection request is forwarded to routing module after being converted to the response message of first connection request；
NAT44 unit is forwarded to routing module after the privately owned connection request is converted to second connection request, and will
The response message of second connection request is sent to NAT64 unit after being converted to the response message of the privately owned connection request.
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