CN102148882B - Dynamic domain name analytic method and system after deployment of NAT - Google Patents
Dynamic domain name analytic method and system after deployment of NAT Download PDFInfo
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- 238000000034 method Methods 0.000 claims description 21
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Abstract
The invention provides a dynamic domain name analytic method and system after deployment of NAT (Network Address Translation). The dynamic domain name analytic method comprises the steps: DDNS (Dynamic Domain Name System) subscriber equipment sends a network access request to access equipment of an operator; the access equipment of the operator forwards the network access request to NAT equipmentso as to obtain a public network IP address and a private network IP address from the NAT equipment for DDNS subscriber equipment allocation, and sends the public network IP address and the domain name address of the DDNS subscriber equipment to a DDNS server; the DDNS server correlatively saves the received domain name address and the public network IP address; and when receiving a domain name analytic request from guest user equipment, the DDNS server performs domain name analysis according to the correlatively saved public network IP address and the domain name address. The invention realizes the dynamic domain name analysis under the condition of deployment of NAT by a telecom operator.
Description
Technical field
(Network Address Translation, be called for short: the dynamic territory analyzing method and system NAT) belong to the domain name mapping technical field to the present invention relates to a kind of on-premise network address translation.
Background technology
Dynamic territory analyzing service (Dynamic Domain Name System, be called for short: DDNS) be a kind of can be with fixing internet domain name and dynamic IP addressing corresponding service of resolving in real time.For traditional static DNS, it can be resolved to a fixed domain name a dynamic IP address, briefly, no matter what kind of IP address when the user surf the Net, surf the Net in which way, obtain, whether the IP address can change, and can both guarantee that other users can just can have access to user's computer by a fixed domain name.
Fast development along with the Internet; the IP address has become scarce resource gradually; for this reason; telecom operators will probably dispose the NAT solution; wherein; NAT be a kind of be the switch technology of legal public network IP address with privately owned (reservation) address spaces; it is widely used in all kinds interconnection network access mode and the various types of network; solved the problem of 1P address shortage to a certain extent; but also can avoid attack from network-external effectively, hide and the computer of protecting network inside.
Yet there are the following problems at least in the prior art:
After disposing NAT, dynamic acquisition IP address is not only in user's online, and what obtain is private IP address, because this private network IP address can not overall route, makes that traditional DDNS can't operate as normal.
Summary of the invention
The invention provides the dynamic territory analyzing method and system behind a kind of NAT of deployment, in order to after disposing NAT, still can realize dynamic territory analyzing.
One aspect of the present invention provides the method for the dynamic territory analyzing behind a kind of NAT of deployment, comprising:
The DDNS subscriber equipment sends the network insertion request to access equipment of operators;
Described access equipment of operators is transmitted to NAT device with described network insertion request, obtain to be the public network IP address of this DDNS user equipment allocation and private network IP address from described NAT device, and the domain name addresses of this public network IP address and described DDNS subscriber equipment is sent to the DDNS server jointly;
Described DDNS server carries out related preservation with the domain name address that receives with described public network IP address;
When described DDNS server receives the domain name mapping request that comes from visiting subscriber equipment, carry out domain name mapping according to related described public network IP address and domain name addresses of preserving.
The present invention provides a kind of dynamic territory analyzing system on the other hand, comprising DDNS subscriber equipment, access equipment of operators, NAT device and DDNS server, described DDNS subscriber equipment is arranged in private network, described NAT device and DDNS server are arranged in public network, described access equipment of operators connects described private network and described public network, wherein:
Described DDNS subscriber equipment is used for sending the network insertion request to described access equipment of operators;
Described access equipment of operators comprises:
Forwarding module is transmitted to described NAT device for the described network insertion request that will come from the DDNS subscriber equipment;
Acquisition module is used for obtaining to be the public network IP address of this DDNS user equipment allocation and private network IP address from described NAT device, and the domain name addresses of this public network IP address and described DDNS subscriber equipment is sent to described DDNS server jointly;
The network insertion request that described NAT device is used for sending according to described DDNS subscriber equipment is this DDNS user equipment allocation public network IP address and private network IP address;
Described DDNS server comprises:
Relating module is used for related preservation is carried out with described public network IP address in the domain name address that receives;
Parsing module is used for when receiving the domain name mapping request of the visiting subscriber equipment that comes from public network, carries out domain name mapping according to related public network IP address and the domain name addresses of preserving of relating module.
The present invention replaces the DDNS subscriber equipment to realize the dynamic territory analyzing function by using access equipment of operators, thereby has realized the dynamic territory analyzing under the deployment NAT of telecom operators condition.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the dynamic territory analyzing method embodiment behind the deployment NAT of the present invention;
Fig. 2 is the structural representation of dynamic territory analyzing system embodiment of the present invention;
Fig. 3 is the internal structure schematic diagram of access equipment of operators 20 in the system shown in Figure 2;
Fig. 4 is the internal structure schematic diagram of DDNS server 40 in the system shown in Figure 2.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is the flow chart of the dynamic territory analyzing method embodiment behind the deployment NAT of the present invention, and as shown in the figure, this method comprises the steps:
Wherein, described DDNS subscriber equipment refers to wish provide by the DDNS server the employed equipment of user of dynamic territory analyzing service, for example the server of a website etc.Particularly, this DDNS subscriber equipment can be by point-to-point protocol (the Point-to-Point Protocol over Ethernet based on Ethernet, be called for short: PPPoE) mode or based on the Internet protocol of Ethernet (Internet Protocol over Ethernet, be called for short: IPoE) mode is sent the network insertion request to access equipment of operators.
Wherein, described access equipment of operators can for Broadband Remote Access Server (Broadband Remote Access Server, be called for short: BRAS), in order to long-range broadband inserting service to be provided.If authentification failure then finishes whole flow process; Described user name and password are that the user obtains when professional to operator's application.
Need to prove herein, if access equipment of operators can adopt other modes to determine the legitimacy of this DDNS subscriber equipment, then can omit this step.
Particularly, the process that described access equipment of operators obtains described public network IP address and private network IP address comprises: described access equipment of operators can be transmitted to described NAT device with described network insertion request earlier, and then be described DDNS user equipment allocation public network IP address and private network IP address by described NAT device, and the described public network IP address that will distribute and private network IP address return to described access equipment of operators.
Wherein, described NAT device refers to possess the equipment of nat feature; Described distribution public network IP address and private network IP address refer to for the public network IP address of same DDNS user equipment allocation and private network IP address be not changeless, when sending the network insertion request again behind this DDNS subscriber equipment broken string, NAT device might distribute different public network IP address and private network IP address for it; The domain name addresses of described DDNS subscriber equipment is that the user submits to when professional to operator's application.
Wherein, described visiting subscriber equipment refers to visit the user terminal of described DDNS subscriber equipment.Particularly, described DDNS server can be searched corresponding public network IP address according to the domain name addresses of carrying in the domain name analysis request and return to described visiting subscriber equipment from the related described public network IP address of preserving and domain name addresses, to realize domain name mapping.
After this, described visiting subscriber equipment can communicate by this public network IP and described DDNS subscriber equipment, specifically can comprise the steps:
Particularly, described access equipment of operators can be searched the address with the corresponding private network IP of described public network IP address according to the address mapping table of the public network IP address of preserving in the described NAT device and private network IP address, generates when the address mapping table of this moment is described DDNS user equipment allocation public network IP address and private network IP address by described NAT device in step 130 and is kept in this NAT device;
Perhaps, described access equipment of operators also can be searched the address with the corresponding private network IP of described public network IP address according to the public network IP address of this access equipment of operators self preservation and the address mapping table of private network IP address, the address mapping table of this moment is that basis is generated from public network IP address and the private network IP address that NAT device obtains by described access equipment of operators in step 130, and is kept in this access equipment of operators.
The described method of present embodiment replaces the DDNS subscriber equipment to realize the dynamic territory analyzing function by using access equipment of operators, thereby has realized the dynamic territory analyzing under the deployment NAT of telecom operators condition.
Fig. 2 is the structural representation of dynamic territory analyzing system embodiment of the present invention, as shown in the figure, this system comprises: DDNS subscriber equipment 10, access equipment of operators 20, NAT device 30 and DDNS server 40, described DDNS subscriber equipment 10 is arranged in private network, described NAT device 30 and DDNS server 40 are arranged in public network, described access equipment of operators 20 connects described private network and described public network, and its operation principle is as follows:
Described DDNS subscriber equipment 10 sends described network insertion request to described access equipment of operators 20, wherein, described DDNS subscriber equipment 10 refers to wish provide by DDNS server 40 the employed equipment of user of dynamic territory analyzing service, for example the server of a website etc.Particularly, this DDNS subscriber equipment 10 can be by sending the network insertion request based on PPP over Ethernet or based on the IPoE mode to access equipment of operators 20.
After this, as shown in Figure 3, described access equipment of operators 20 authenticates described DDNS subscriber equipment 10 according to the user name of carrying in the described network insertion request and password by authentication module 23, authentication by after will come from DDNS subscriber equipment 10 by forwarding module 21 again described network insertion request be transmitted to described NAT device 30, the network insertion request of being sent according to described DDNS subscriber equipment 10 by this NAT device 30 is this DDNS user equipment allocation public network IP address and private network IP address.Wherein, described access equipment of operators 20 for example can be BRAS, need to prove herein, if access equipment of operators 20 can adopt other modes to determine the legitimacy of this DDNS subscriber equipment 10, then can omit authentication module 23.
After this, it is public network IP address and the private network IP address that this DDNS subscriber equipment 10 distributes that described access equipment of operators 20 obtains from described NAT device 30 by acquisition module 22, and the domain name addresses of this public network IP address and described DDNS subscriber equipment 10 is sent to described DDNS server 40 jointly
After this, as shown in Figure 4, described DDNS server 40 carries out related preservation with the domain name address that receives with described public network IP address by relating module 41; When receiving the domain name mapping request of the visiting subscriber equipment that comes from public network, carry out domain name mapping by parsing module 42 according to related public network IP address and the domain name addresses of preserving of relating module.Wherein, described visiting subscriber equipment refers to visit the user terminal of described DDNS subscriber equipment.Particularly, described parsing module 42 can be searched corresponding public network IP address according to the domain name addresses of carrying in the domain name analysis request and return to described visiting subscriber equipment from the related described public network IP address of preserving and domain name addresses, to realize domain name mapping.
After this, described visiting subscriber equipment can communicate by this public network IP and described DDNS subscriber equipment 10, particularly, this visiting subscriber equipment is that destination address sends communication data packet to described access equipment of operators 20 with the described public network IP address that receives earlier; When described access equipment of operators 20 receive by described visiting subscriber equipment with described public network IP address be destination address send communication data packet the time, search corresponding private network IP address by searching module 24 according to this public network IP address, according to searching the described private network IP address that module 24 finds described communication data packet is sent to corresponding DDNS subscriber equipment by communication module 25 then.Concrete search procedure can realize the related content of example referring to said method.
The described system of present embodiment replaces the DDNS subscriber equipment to realize the dynamic territory analyzing function by using access equipment of operators, thereby has realized the dynamic territory analyzing under the deployment NAT of telecom operators condition.
Below illustrate the signaling process that the described system of present embodiment realizes, as shown in Figure 2, comprise following process:
(1) the DDNS subscriber equipment sends the network insertion request by PPP over Ethernet or IPoE mode to access equipment of operators;
(2) access equipment of operators can send to described NAT device with described network insertion request earlier;
(3) NAT device is described DDNS user equipment allocation public network IP address and private network IP address, and the described public network IP address that will distribute and private network IP address return to described access equipment of operators;
(4) access equipment of operators sends to the DDNS server jointly with the domain name addresses of public network IP address and described DDNS subscriber equipment, by this DDNS server related preservation is carried out with described public network IP address in the domain name address that receives;
(5) visiting subscriber equipment sends the domain name mapping request to the DDNS server;
(6) the DDNS server carries out domain name mapping according to related described public network IP address and domain name addresses of preserving, and corresponding public network IP address is returned to described visiting subscriber equipment;
(7) visiting subscriber equipment is that destination address sends communication data packet to described access equipment of operators with the described public network IP address that receives;
(8) access equipment of operators is inquired about the corresponding private IP address of described public network IP address to the NAT device request;
(9) NAT device returns the private IP address that finds;
(10) access equipment of operators sends to corresponding DDNS subscriber equipment according to this private network IP address with described communication data packet.
Need to prove herein, if the public network IP address of described access equipment of operators support maintenance this locality and the address mapping table of private network IP address, then described access equipment of operators can directly be inquired about local address mapping table, therefore can omit above-mentioned (8) step and (9) step.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. dynamic territory analyzing method of disposing behind the NAT is characterized in that comprising:
The DDNS subscriber equipment sends the network insertion request to access equipment of operators;
Described access equipment of operators is transmitted to NAT device with described network insertion request, obtain to be the public network IP address of this DDNS user equipment allocation and private network IP address from described NAT device, and the domain name addresses of this public network IP address and described DDNS subscriber equipment is sent to the DDNS server jointly;
Described DDNS server carries out related preservation with the domain name address that receives with described public network IP address;
When described DDNS server receives the domain name mapping request that comes from visiting subscriber equipment, carry out domain name mapping according to related described public network IP address and domain name addresses of preserving.
2. method according to claim 1, it is characterized in that described DDNS subscriber equipment sends the network insertion request to access equipment of operators and comprises: described DDNS subscriber equipment sends the network insertion request by PPP over Ethernet or IPoE mode to access equipment of operators.
3. method according to claim 1, it is characterized in that described access equipment of operators also comprises before described network insertion request is transmitted to described NAT device: described access equipment of operators authenticates described DDNS subscriber equipment according to the user name of carrying in the described network insertion request and password.
4. method according to claim 1 is characterized in that the related described public network IP address of preserving of described basis and domain name addresses carry out domain name mapping and comprise: search corresponding public network IP address according to the domain name addresses of carrying in the domain name analysis request from the related described public network IP address of preserving and domain name addresses and return to described visiting subscriber equipment.
5. method according to claim 4 is characterized in that describedly searching corresponding public network IP address and also comprising after returning to described visiting subscriber equipment:
Described visiting subscriber equipment is that destination address sends communication data packet to described access equipment of operators with the described public network IP address that receives;
Described access equipment of operators is searched corresponding private network IP address according to described public network IP address, and according to this private network IP address described communication data packet is sent to corresponding DDNS subscriber equipment.
6. method according to claim 5 is characterized in that described access equipment of operators searches corresponding private network IP address according to described public network IP address and comprise: search the address with the corresponding private network IP of described public network IP address according to the address mapping table of the public network IP address of preserving in described access equipment of operators or the described NAT device and private network IP address.
7. dynamic territory analyzing system, it is characterized in that comprising DDNS subscriber equipment, access equipment of operators, NAT device and DDNS server, described DDNS subscriber equipment is arranged in private network, described NAT device and DDNS server are arranged in public network, described access equipment of operators connects described private network and described public network, wherein:
Described DDNS subscriber equipment is used for sending the network insertion request to described access equipment of operators;
Described access equipment of operators comprises:
Forwarding module is transmitted to described NAT device for the described network insertion request that will come from the DDNS subscriber equipment;
Acquisition module is used for obtaining to be the public network IP address of this DDNS user equipment allocation and private network IP address from described NAT device, and the domain name addresses of this public network IP address and described DDNS subscriber equipment is sent to described DDNS server jointly;
The network insertion request that described NAT device is used for sending according to described DDNS subscriber equipment is this DDNS user equipment allocation public network IP address and private network IP address;
Described DDNS server comprises:
Relating module is used for related preservation is carried out with described public network IP address in the domain name address that receives;
Parsing module is used for when receiving the domain name mapping request of the visiting subscriber equipment that comes from public network, carries out domain name mapping according to related public network IP address and the domain name addresses of preserving of relating module.
8. system according to claim 7 is characterized in that described access equipment of operators also comprises: authentication module, the user name and the password that are used for carrying according to described network insertion request authenticate described DDNS subscriber equipment.
9. system according to claim 7 is characterized in that described access equipment of operators also comprises:
Search module, be used for when receive by described visiting subscriber equipment with described public network IP address be destination address send communication data packet the time, search corresponding private network IP address according to this public network IP address;
Communication module, be used for according to search module searches to described private network IP address described communication data packet is sent to corresponding DDNS subscriber equipment.
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| CN 201110104073 CN102148882B (en) | 2011-04-25 | 2011-04-25 | Dynamic domain name analytic method and system after deployment of NAT |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103621036A (en) * | 2012-06-15 | 2014-03-05 | 华为技术有限公司 | Registration method, device, and system |
| CN102891901A (en) * | 2012-09-25 | 2013-01-23 | 中国联合网络通信集团有限公司 | Dynamic domain name resolution method, server and domain name service system |
| CN105227686B (en) * | 2014-06-20 | 2019-04-09 | 中国电信股份有限公司 | The Dynamic Configuration and system of cloud host domain name |
| CN105657077B (en) * | 2014-11-13 | 2019-09-13 | 中国移动通信集团公司 | A kind of network address commutation traversing method and network address translation apparatus |
| CN106941527B (en) * | 2017-03-15 | 2021-02-02 | 网宿科技股份有限公司 | Data transmission transfer method and system |
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| CN1516415A (en) * | 2003-01-10 | 2004-07-28 | 上海通用化工技术研究所 | Decimal number gateway |
| CN101043447A (en) * | 2007-04-23 | 2007-09-26 | 重庆大学 | Method for mapping dynamically inside and outside network of server based on DDNS and NAT |
| WO2008116416A1 (en) * | 2007-03-26 | 2008-10-02 | Huawei Technologies Co., Ltd. | Method, device and system for domain name system to update dynamically |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516415A (en) * | 2003-01-10 | 2004-07-28 | 上海通用化工技术研究所 | Decimal number gateway |
| WO2008116416A1 (en) * | 2007-03-26 | 2008-10-02 | Huawei Technologies Co., Ltd. | Method, device and system for domain name system to update dynamically |
| CN101043447A (en) * | 2007-04-23 | 2007-09-26 | 重庆大学 | Method for mapping dynamically inside and outside network of server based on DDNS and NAT |
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