CN103888554B - IPv4 and the domain name analytic method and system of IPv6 intercommunications - Google Patents
IPv4 and the domain name analytic method and system of IPv6 intercommunications Download PDFInfo
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- CN103888554B CN103888554B CN201410112244.9A CN201410112244A CN103888554B CN 103888554 B CN103888554 B CN 103888554B CN 201410112244 A CN201410112244 A CN 201410112244A CN 103888554 B CN103888554 B CN 103888554B
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Abstract
The present invention provides a kind of IPv4 and the domain name analytic method of IPv6 intercommunications, comprises the following steps：The query message that the dns server of source host is sent is received, the query message is sent to the dns server of destination host；The dns server of the destination host is received according to the error message returned after the response message or domain name mapping failure returned after query message progress domain name mapping success；If receiving the error message, by the resource record types of the query message according to the dns server that the destination host is sent to after procotol progress form modifying, wherein, the procotol includes IPv4 agreements and IPv6 agreements.Present invention system also corresponding to offer, can significantly improve network communication efficiency.
Description
Technical field
The present invention relates to Internet technical field, more particularly to a kind of IPv4 and the domain name analytic method of IPv6 intercommunications,
A kind of and IPv4（Internet Protocol4, Internet protocol fourth edition）With IPv6（Internet Protocol6, mutually
Networking protocol sixth version）The domain name analysis system of intercommunication.
Background technology
At present, it is leading using IPv4 technologies in data network, with the expansion of network size, IPv6 technologies are huge with its
The advantages such as address space will gradually substitute current IPv4 technologies.However, this thoroughly substitution needs long-term process.At this
It is individual for a long time from IPv4 to during IPv6 evolution, in order to share Internet resources, it is necessary to solve IPv4 networks and IPv6 networks
The problem of intercommunication.Therefore, IETF（Internet Engineering Task Force, Internet Engineering Task group）Propose
A series of transitional technologies, wherein just including NAT-PT（network address translation-protocol
Translation, the network address translater of subsidiary protocol converter）Technology, it is SIIT（stateless IP/ICMP
Translation, stateless IP/ICMP translation technologies）Dynamic address translation technology in protocol conversion technology and IPv4 networks
（NAT, Network Address Translation）A kind of technology being combined, positioned at the intersection of IPv6 and IPv4 networks,
The intercommunication between pure IPv6 main frames and pure IPv4 main frames can be realized.
With DNS-ALG（Domain Name System-Application Level Gateway, the application of domain name system
Layer gateway）Important role is play during NAT-PT agreements are run for the domain name mapping module of core, it makees substantially
Be network edge monitor come in and go out network DNS query and respond and it is modified, so as to ensure communication one end energy
Enough obtain the address that gateway is other end distribution.In actual use, it is not only to ensure the elder generation of NAT-PT gateway two-way communications
Certainly condition, and be the important guarantee that NAT-PT possesses practicality.
Under interim network environment, if the node in IPv6 networks will establish connection or anti-mistake with IPv4 network nodes
Connection will be established with IPv6 nodes by carrying out IPv4 network nodes, all need first to obtain other side's IP address by DNS query, then by DNS-
ALG is converted into the form of node understanding.
In conventional art after the DNS query that IPv4 nodes are sent is received, the website corresponding to not knowing the domain name is
IPv4 websites or IPv6 websites, DNS-ALG can send two and different types of look on the basis of address conversion is carried out to it
Ask message.If the node being queried is dual stack node, you can also be visited by IPv4 protocol access by IPv6 agreements
Ask, then return response message can record simultaneously node former IPv4 addresses and former IPv6 addresses by NAT-PT gateways translation
IPv4 addresses.Namely one request, obtain two replies.Although it can find what request accessed by the two addresses
Dual stack node, but if IPv4 addresses of the selection IPv6 after gateway is translated, it is meant that each data transfer to double stacks
Node, primary address translation will be carried out.And select the IPv4 addresses of dual stack node that this problem is just not present.This selection
As a result so that two the node of direct communication can have to carry out by NAT-PT gateways under same protocol environment originally
Communication, as a result not only reduces communication efficiency, also wastes the precious resources of NAT-PT gateways.
The content of the invention
Based on this, the present invention provides a kind of IPv4 and the domain name analytic method and system of IPv6 intercommunications, can significantly improve net
Network communication efficiency.
A kind of IPv4 and the domain name analytic method of IPv6 intercommunications, comprise the following steps：
The query message that the dns server of source host is sent is received, the query message is sent to the DNS of destination host
Server；
The dns server for receiving the destination host is answered according to what the query message returned after domain name mapping is successful
Answer the error message returned after information or domain name mapping failure；
If receiving the error message, the resource record types of the query message are subjected to lattice according to procotol
The dns server of the destination host is sent to after formula modification, wherein, the procotol includes IPv4 agreements and IPv6 is assisted
View.
A kind of IPv4 and the domain name analysis system of IPv6 intercommunications, NAT-PT gateways include DNS-ALG, the DNS-ALG bags
Include：
Sending module, the query message that the dns server for receiving source host is sent, the query message is sent to
The dns server of destination host；
Receiving module, the dns server for receiving the destination host carry out domain name mapping according to the query message
The response message returned after success or the error message returned after domain name mapping failure；
Modified module, if for receiving the error message, by the resource record types of the query message according to
The dns server of the destination host is sent to after procotol progress form modifying, wherein, the procotol includes IPv4
Agreement and IPv6 agreements.
Above-mentioned IPv4 and the domain name analytic method and system of IPv6 intercommunications, can avoid the purpose master being queried in conventional art
The address choice problem that machine occurs when being double stack main frames；It is turn of two kinds of different record types for the problem, in conventional art
Change rear message to be simultaneously emitted by, sending for message is adjusted the present invention on opportunity after conversion, is obtained suitably to reach preferential
The purpose of address.DNS-ALG receives the dns server that destination host is issued after query message, if dual stack node can then return
An IP address with source host procotol same format is returned, the IP address is not the IP address after gateway translation, then source master
Communication efficiency can be significantly improved after machine with double stack main frame direct communications.
Brief description of the drawings
Schematic flow sheets of the Fig. 1 for IPv4 of the present invention and the domain name analytic method of IPv6 intercommunications in one embodiment.
Structural representations of the Fig. 2 for IPv4 of the present invention and the domain name analysis system of IPv6 intercommunications in one embodiment.
Embodiment
The present invention is described in further detail with reference to embodiment and accompanying drawing, but embodiments of the present invention are not limited to
This.
As shown in figure 1, the flow for being IPv4 of the present invention with the domain name analytic method of IPv6 intercommunications in a preferred embodiment
Schematic diagram, comprise the following steps：
S11, DNS-ALG receive the query message that the dns server of source host is sent, and the query message is sent into mesh
Main frame dns server；
Under interim network environment, if the node in IPv6 networks will establish connection or anti-mistake with IPv4 network nodes
Connection will be established with IPv6 nodes by carrying out IPv4 network nodes, all need first to obtain other side's IP address by DNS query, then by DNS-
ALG is converted into the form of node understanding；
When some node, i.e. source host access certain domain name, if source host inquiry is less than the domain name and IP recorded
The mapping relations of address, then inquiry request need to be sent from its dns server to NAT-PT gateways, the request is sent in the form of message
To the DNS-ALG in NAT-PT gateways.
S12, DNS-ALG receive the response message that the dns server of the destination host returns；The response message includes
The response message that the dns server of the destination host according to the query message return after domain name mapping success, or
The error message that domain name mapping unsuccessfully returns；
In the present embodiment, when DNS-ALG receives the query message, by address corresponding with looked into domain name is IPv4 addresses
Or IPv6 addresses are still uncertain；Therefore, query message is sent to the dns server of destination host by DNS-ALG；
Destination host can carry out domain name mapping according to the query message；In the present embodiment, the main frame on network has three
Kind situation：IPv4 main frames, IPv6 main frames and double stack main frames；Dual stack node by IPv4 protocol access or can pass through
IPv6 protocol access；Inquired about because the dns server of source host needs to be submitted to DNS-ALG, then destination host has two
Kind situation, it is different from the procotol of source host, or double stack main frames；
If double stack main frames, then after the query message is sent to the dns server of destination host by DNS-ALG, it can connect
Receive the response message that destination host according to the query message return after domain name mapping success；
Specifically, the domain name that the source host is to be checked is included in the query message；The response message includes described
The IP address of domain name.
If S13, DNS-ALG receive the error message, by the resource record types of the query message according to net
The dns server of the destination host is sent to after network agreement progress form modifying, wherein, the procotol includes IPv4 and assisted
Negotiation IPv6 agreements；
If different from the procotol of source host, the DNS that the query message is sent to destination host by DNS-ALG takes
It is engaged in after device, then the dns server of destination host occurs that domain name mapping fails, and returns to error message；
If DNS-ALG receives the error message, you can know that destination host is different from the procotol of source host, can
The resource record types of the query message are subjected to form modifying according to procotol, are modified as the DNS service of destination host
The supported form of device, the dns server of destination host receive rear domain name successfully resolved, can return to correct response message.
In a preferred embodiment, before the step of query message is sent to the dns server of destination host,
Also include the step that address conversion is carried out to the procotol that the query message is supported according to the dns server of destination host
Suddenly；During DNS-ALG forwarding inquiries messages, address conversion need to be carried out to query message, to be accurately sent to destination host
Dns server.
Here address conversion, when referring to the address format difference when source host and destination host, done at Interworking gateway
Address conversion.If IPv4 main frames are by gateway access IPv6 main frames, need to be converted to former IPv4 address formats in gateway
IPv6 address formats, it could be identified by the dns server of network where IPv6 main frames.Purpose IPv6 main frames receive request message
Afterwards, a response message is returned, is sent to gateway, the source address in response message and destination address are converted to IPv4 by gateway again
Form, it is sent to requesting host.
In a preferred embodiment, because IPv4 agreements are different from the address format of IPv6 agreements, it is necessary to change inquiry report
Text, the resource record types by the query message include according to the step of procotol progress form modifying：
If the resource record types of the query message are A, according to the IPv6 agreements, by the money of the query message
Source record type is AAAA；
If the resource record types of the query message are AAAA, according to the IPv4 agreements, by the query message
Resource record types be A.
The address choice that the destination host that the present embodiment can avoid being queried in conventional art occurs when being double stack main frames is asked
Topic；Address choice when being communicated for DNS-ALG with dual stack node be present, be two kinds of different record types in conventional art
Message is simultaneously emitted by after conversion, and to this present embodiment, sending for message is adjusted on opportunity after conversion, to reach preferential
Obtain the purpose of proper address.DNS-ALG receives the dns server that destination host is issued after query message, if double stack sections
Point then can return to an IP address with source host procotol same format, and the IP address is not the IP after gateway is translated
Location, then it can significantly improve communication efficiency with double stack main frame direct communications after source host.
For example, when IPv6 main frames send query message, when DNS AAAA query messages are by NAT-PT gateways, DNS-ALG
The dns server that will be forwarded to behind query message conversion address in gateway opposite side network, and DNS-ALG wouldn't generate A notes
Record the query message of type.If dns server does not understand AAAA inquiries or the AAAA without interdependent node is recorded, one is returned to
Individual error message.If the DNS-ALG of gateway receives this error message, retransmit an A on the node and inquire about.Such as
This inquiry of fruit returns an IPv4 address, then generates the response message of AAAA records according to the return by DNS-ALG, then
IPv6 main frames corresponding to forwarding it to.
When IPv4 main frames send query message, when DNS A query messages are by NAT-PT gateways, DNS-ALG inquires about this
The dns server being forwarded to behind message conversion address in gateway opposite side network, and DNS-ALG wouldn't generate AAAA record types
Query message.If dns server does not understand A inquiries or the A without interdependent node is recorded, an error message is also returned to.
When the DNS-ALG of gateway receives this error message, then retransmit an AAAA on the node and inquire about.If this is inquired about
An IPv6 address is returned, then the response message that A records is generated according to the return by DNS-ALG, is then forwarded to pair
The IPv4 main frames answered.
It may know that by two above example, the DNS responses that NAT-PT gateways return to first success are transmitted to terminal
Main frame, if unsuccessful, then return to mistake；, so can be obvious so as to which node has to a suitable return address
Improve the efficiency of domain name mapping.
Wherein, in order to improve the efficiency of domain name mapping module, in site configuration, DNS-ALG can be according to NAT-PT nets
The particular condition in use of IPv6 websites carries out the default DNS server setting of node inside the Pass.If Intra-site node is to access
Based on IPv6 networks, simply need to access IPv4 networks once in a while, then will be local when setting node dns server address
IPv6DNS servers are set to primary dns server, and the dns server uses the root dns server that can be accessed by IPv6；Will
Prefix_ipv4_dns is set to auxiliary dns server, and so, usually most DNS query message is able to pass in IPv6 environment
Broadcast without passing through NAT-PT gateways again.When domain name mapping can not obtain IPv6 addresses corresponding to domain name, then auxiliary DNS clothes are enabled
Device be engaged in by being inquired about on NAT-PT gateways to IPv4DNS servers.When Intra-site node to access the node in IPv4 networks
For it is main when, then exchange the address of major-minor dns server, can reach the purpose for improving search efficiency.
Next of the invention by embodiment explanation again, source host is IPv4 main frames in the present embodiment, and destination host is
IPv6 main frames；
IPv4 main frames send DNS query, the address of the entitled www.A.com of interrogation field IPv6 main frames, because source host makes
With IPv4 agreements, thus the type of domain name is A in the DNS query (record type of corresponding IPv6 agreements is AAAA).
IPv4 dns server checks the record of oneself after receiving DNS request, if the not record, IPv4DNS will turn
Send out this DNS request.
The DNS-ALG of NAT-PT gateways receives DNS query request, by corresponding with looked into domain name address is IPv4
Location or IPv6 addresses are still uncertain, therefore DNS-ALG is just directly emitted to purpose only making address conversion to former query message
The dns server of main frame.
The dns server of destination host receives query message, and because the resource record types of the query message are A, DNS takes
The domain name mapping failure of business device, returns to error message；
DNS-ALG receives error message, and the resource record types of query message are revised as into AAAA from A, again to
IPv6DNS is forwarded.
IPv6DNS searches the record of oneself after receiving this inquiry, obtains IPv6 addresses 1 corresponding to domain name www.a.com::
3.Then this address is inserted to the answer field of DNS response messages, now the type of DNS response messages is AAAA.Then return
Again to DNS-ALG.
After DNS-ALG receives response message, DNS response parts therein are modified, " AAAA " class is changed into " A " class
Response.
NAT-PT gateways distribute an address 1.4.2.6 from IPv4 address pools, replace the IPv6 addresses 1 in response::3,
And record map information therebetween.
For IPv4 main frames after this DNS response is received, the IPv4 addresses for being known that main frame www.a.com are 1.4.2.6.
So far, DNS-ALG end-of-jobs.
IPv4 main frames send message, SRC=1.2.2.9, DST=1.4.2.6 to NAT-PT gateways.
IPv4 messages are routed to NAT-PT gateways, due to have recorded in NAT-PT IPv4 addresses 1.4.2.6 with
IPv6 addresses 1::Map information between 3, just replaces with 1 by address::3.The prefix defined in addition using gateway is to source address
Modify, forming IPv6 addresses is：Prefix::1.2.2.9, and E-Packet to address be 1::3 IPv6 main frames.
As shown in Fig. 2 Pv4 and the domain name analysis system of IPv6 intercommunications, NAT-PT gateway bags of the invention also corresponding to offer
DNS-ALG is included, the DNS-ALG includes：
Sending module 21, the query message that the dns server for receiving source host is sent, the query message is sent
Dns server to destination host；
Under interim network environment, if the node in IPv6 networks will establish connection or anti-mistake with IPv4 network nodes
Connection will be established with IPv6 nodes by carrying out IPv4 network nodes, all need first to obtain other side's IP address by DNS query, then by DNS-
ALG is converted into the form of node understanding；
When some node, i.e. source host access certain domain name, if source host inquiry is less than the domain name and IP recorded
The mapping relations of address, then inquiry request need to be sent from its dns server to NAT-PT gateways, the request is sent in the form of message
To the DNS-ALG in NAT-PT gateways.
Receiving module 22, the dns server for receiving the destination host carry out domain name solution according to the query message
The response message returned after analysing successfully or the error message returned after domain name mapping failure；
In the present embodiment, when DNS-ALG receives the query message, by address corresponding with looked into domain name is IPv4 addresses
Or IPv6 addresses are still uncertain；Therefore, query message is sent to the dns server of destination host by DNS-ALG；
Destination host can carry out domain name mapping according to the query message；In the present embodiment, the main frame on network has three
Kind situation：IPv4 main frames, IPv6 main frames and double stack main frames；Dual stack node by IPv4 protocol access or can pass through
IPv6 protocol access；Inquired about because the dns server of source host needs to be submitted to DNS-ALG, then destination host has two
Kind situation, it is different from the procotol of source host, or double stack main frames；
If double stack main frames, then after the query message is sent to the dns server of destination host by DNS-ALG, it can connect
Receive the response message that destination host according to the query message return after domain name mapping success；
Specifically, the domain name that the source host is to be checked is included in the query message；The response message includes described
The IP address of domain name.
Modified module 23, if for receiving the error message, by the resource record types root of the query message
According to the dns server that the destination host is sent to after procotol progress form modifying, wherein, the procotol includes
IPv4 agreements and IPv6 agreements；
If different from the procotol of source host, the DNS that the query message is sent to destination host by DNS-ALG takes
It is engaged in after device, then the dns server of destination host occurs that domain name mapping fails, then returns to error message；
If DNS-ALG receives the error message, you can know that destination host is different from the procotol of source host, can
The resource record types of the query message are subjected to form modifying according to procotol, are modified as the DNS service of destination host
The supported form of device, the dns server of destination host receive rear domain name successfully resolved, can return to correct response message.
In a preferred embodiment, modular converter is may also include, for the DNS to the query message according to destination host
The procotol that server is supported carries out address conversion；During DNS-ALG forwarding inquiries messages, row address need to be entered to query message
Conversion, to be accurately sent to the dns server of destination host.
In a preferred embodiment, because IPv4 agreements are different from the address format of IPv6 agreements, it is necessary to change inquiry report
Text, the modified module are additionally operable to：If the resource record types of the query message are A, according to the IPv6 agreements, by institute
The resource record types for stating query message are revised as AAAA；If the resource record types of the query message are AAAA, basis
The IPv4 agreements, the resource record types of the query message are revised as A.
IPv4 of the present invention and the domain name analytic method and system of IPv6 intercommunications, can avoid the purpose being queried in conventional art
The address choice problem that main frame occurs when being double stack main frames；It is two kinds of different record types for the problem, in conventional art
Message is simultaneously emitted by after conversion, and to this present invention, sending for message is adjusted on opportunity after conversion, is preferentially obtained with reaching
Take the purpose of proper address.DNS-ALG receives the dns server that destination host is issued after query message, if dual stack node
An IP address with source host procotol same format is then can return to, the IP address is not the IP address after gateway translation,
Then communication efficiency can be significantly improved after source host with double stack main frame direct communications.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of IPv4 and the domain name analytic method of IPv6 intercommunications, it is characterised in that comprise the following steps：
The query message sent by the dns server of DNS-ALG reception source hosts, and the query message is sent to purpose
The dns server of main frame；
Received by DNS-ALG after the dns server of the destination host carries out domain name mapping success according to the query message
The error message returned after the response message of return or domain name mapping failure；
If receiving the error message, i.e., the procotol difference of destination host and source host when, then by DNS-ALG by institute
The resource record types of query message are stated according to the DNS service that the destination host is sent to after procotol progress form modifying
Device, the dns server of destination host receive rear domain name successfully resolved, can return to correct response message, wherein, the network
Agreement includes IPv4 agreements and IPv6 agreements.
2. the domain name analytic method of IPv4 according to claim 1 and IPv6 intercommunications, it is characterised in that by the inquiry
Message was sent to before the step of dns server of destination host, in addition to the DNS to the query message according to destination host
The procotol that server is supported carries out the step of address conversion.
3. IPv4 according to claim 1 and the domain name analytic method of IPv6 intercommunications, it is characterised in that described to be looked into described
Ask the resource record types of message includes according to the step of procotol progress form modifying：
If the resource record types of the query message are A, according to the IPv6 agreements, the resource of the query message is remembered
Record type is revised as AAAA；
If the resource record types of the query message are AAAA, according to the IPv4 agreements, by the money of the query message
Source record type is revised as A.
4. IPv4 and the domain name analytic method of IPv6 intercommunications according to any one of claims 1 to 3, it is characterised in that institute
State in query message comprising the domain name that the source host is to be checked；The response message includes the IP address of domain name.
5. a kind of IPv4 and the domain name analysis system of IPv6 intercommunications, NAT-PT gateways include DNS-ALG, it is characterised in that described
DNS-ALG includes：
Sending module, for receiving the query message that sends of dns server of source host by DNS-ALG, and by the inquiry
Message is sent to the dns server of destination host；
Receiving module, the dns server for receiving the destination host by DNS-ALG carry out domain according to the query message
The response message returned after name successfully resolved or the error message returned after domain name mapping failure；
Modified module, if during procotol difference for receiving the error message, i.e. destination host and source host, then lead to
Cross after the resource record types of the query message are carried out form modifying by DNS-ALG according to procotol and be sent to the purpose
The dns server of main frame, the dns server of destination host receive rear domain name successfully resolved, can return to correct response message,
Wherein, the procotol includes IPv4 agreements and IPv6 agreements.
6. IPv4 according to claim 5 and the domain name analysis system of IPv6 intercommunications, it is characterised in that also including modulus of conversion
Block, the procotol for being supported according to the dns server of destination host the query message carry out address conversion.
7. IPv4 according to claim 5 and the domain name analysis system of IPv6 intercommunications, it is characterised in that the modified module
It is additionally operable to：If the resource record types of the query message are A, according to the IPv6 agreements, by the money of the query message
Source record type is revised as AAAA；, will according to the IPv4 agreements if the resource record types of the query message are AAAA
The resource record types of the query message are revised as A.
8. IPv4 and the domain name analysis system of IPv6 intercommunications according to any one of claim 5 to 7, it is characterised in that institute
State in query message comprising the domain name that the source host is to be checked；The response message includes the IP address of domain name.
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| WO2016015206A1 (en) * | 2014-07-28 | 2016-02-04 | 华为技术有限公司 | Method for activating internet protocol (ip) and terminal device |
| CN106559505A (en) * | 2015-09-25 | 2017-04-05 | 中兴通讯股份有限公司 | IP method for parameter configuration, network address processing method and processing device |
| CN109981595B (en) * | 2019-03-05 | 2022-04-12 | 网宿科技股份有限公司 | Resource acquisition method, resource return method, server and storage medium |
| CN111262958B (en) * | 2020-01-09 | 2023-02-03 | 深信服科技股份有限公司 | Internal and external website interaction method, device, equipment and computer readable storage medium |
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| CN1585376A (en) * | 2003-08-20 | 2005-02-23 | 华为技术有限公司 | Addressing converting method and mixed addressing converting router for realizing it |
| US7472201B1 (en) * | 2002-09-12 | 2008-12-30 | Cisco Technology, Inc. | Method and system for resolving domain name system queries in a multiprotocol communications network |
| CN101917491A (en) * | 2010-05-20 | 2010-12-15 | 中兴通讯股份有限公司 | Method and terminal for improving domain name resolution efficiency |
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| US7472201B1 (en) * | 2002-09-12 | 2008-12-30 | Cisco Technology, Inc. | Method and system for resolving domain name system queries in a multiprotocol communications network |
| CN1585376A (en) * | 2003-08-20 | 2005-02-23 | 华为技术有限公司 | Addressing converting method and mixed addressing converting router for realizing it |
| CN101917491A (en) * | 2010-05-20 | 2010-12-15 | 中兴通讯股份有限公司 | Method and terminal for improving domain name resolution efficiency |
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