CN101355568B - Method and system for binding router interface supported by static state PAT - Google Patents
Method and system for binding router interface supported by static state PAT Download PDFInfo
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- CN101355568B CN101355568B CN2008102160033A CN200810216003A CN101355568B CN 101355568 B CN101355568 B CN 101355568B CN 2008102160033 A CN2008102160033 A CN 2008102160033A CN 200810216003 A CN200810216003 A CN 200810216003A CN 101355568 B CN101355568 B CN 101355568B
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Abstract
The invention relates to a method and a system for binding a router interface by the support of a static PAT. The method comprises the following steps that: firstly, a static PAT rule for binding the NAT outgoing interface of the router is configured; secondly, the network address interface mapping relationship in accordance with the static PAT rule is established according to the network addressacquired from the outgoing interface; when the outgoing interface receives a TCP/UDP message of which the destination address is the respective interface network address, the network address interface mapping relationship is searched by the destination address and the destination port of the message, if yes, the network address port conversion is performed on the message according to the network address port mapping relationship; and otherwise, the message is taken as the local message of the router. The invention also provides a system for realizing the method. The method and the system can save the application for the fixed Internet IP address, reduce the networking fee, improve the flexibility of using the NAT networking, and have easy realization.
Description
Technical field
The present invention relates to the data communication field, more specifically, relate to the method and system that a kind of static pat (Port AddressTranslation, port address conversion) is supported binding router interface.
Background technology
At present, along with the fast development of network, IPv4 (Internet Protocol Version4, Internet protocol the 4th edition) address faces the problem that the location that lands exhausts.And NAT (Network AddressTranslation, network address translation) can help to alleviate the problem of IPv4 address depletion.The NAT technology is a kind of map addresses technology, and the private IP address with main frame in this subdomain during the host access external host that is generally used for having private IP address in the subdomain is mapped as a unique discernible public network in outside (Internet) IP address; Simultaneously, external host is returned to the private IP address that the public network IP address of internal host shines upon back this main frame of inner mark, make the packet that returns correctly arrive inner destination host.This technology makes different private networks (abbreviation private network) can use identical private IP address section and can not cause the IP address information of public network to cause confusion, thereby expanded the range of application of IP address, alleviated the problem of current I pv4 address space deficiency to a certain extent.
NAT generally can be divided into following three types:
Static NAT: the mapping of private network IP address and Internet IP address be static state one to one.If realize the static mappings relation, be exactly port redirection or static pat/NAPT (NetworkAddress Port Translation, network address port conversion) in conjunction with port;
Dynamically not reusable NAT: use Internet IP address pool technology, from Internet IP address pool, obtain an available IP address and change.After communication finished, this Internet IP address was released back in the address pool.In use, an Internet IP can only have mapping relations;
Dynamic reusable NAT (NAPT): with dynamically can not compare by re-use pattern therefor, the mapping of communication is (for TCP (Transmission Control Protocol by IP address and port numbers, transmission control protocol), UDP (User Datagram Protocol, User Data Protocol) bag is a port numbers, for ICMP (InternetControl Message Protocol, Internet Control Message Protocol) Bao Ze is the bag in ID number) combination finish.
In the networking of the less enterprise of scale is used,, can directly utilize the interface IP address of router to realize networking in order to save exterior I nternet IP address.The IP address configuration of the interface that router is linked to each other with Internet makes private user can utilize dynamic reusable NAT rule visit external network in the NAT rule, and external user is by some machines of static pat rule visit private network inside.These enterprises just can place some servers and visited for external users in private network like this.But when the interface IP address of router is dynamically to obtain by modes such as dialing, and when each resulting address possibility is different, the user has just had difficulties when utilizing interface IP address to realize static pat, the user can not reconfigure the static pat rule when interface IP address changes at every turn, will bring greatly constant like this to the user.Use the fixedly mode of Internet IP if the user changes into, can address this problem; But fixedly the networking expense of Internet IP address will be considerably beyond the mode that dynamically obtains Internet IP address by modes such as dialing to apply for one.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method and system of binding router interface supported by static state PAT are provided, the present invention realizes simply, solved under the situation that router interface dynamically obtains fixed network address not, the static pat rule can not multiplexing this interface network address problem, improved the utilance of interface network address.
A kind of method of binding router interface supported by static state PAT, described method comprises:
Step 1: the static pat rule of configuration binding router NAT outgoing interface;
Step 2: set up the network address port mapping relations that meet the static pat rule of binding described router NAT outgoing interface according to the network address that the NAT outgoing interface of described bound router obtains; The described network address is revocable network address;
Step 3: described bound router NAT outgoing interface receives destination address when being the TCP/UDP message of its own interfaces network address, destination address and destination interface with described message are searched described network address port mapping relations, if have, then described message is carried out the network address port conversion by described network address port mapping relations; Otherwise, described message is handled as the local message of router.
Also comprise after the described step 1:
Step a: judge whether to exist the static pat rule of unbundling interface of the network address of multiplexing described bound NAT outgoing interface, if, execution in step b then; Otherwise execution in step two;
Step b: whether the static pat rule of judging described binding NAT outgoing interface conflicts with the static pat rule of described unbundling interface, if, execution in step c then; Otherwise execution in step two;
Step c: the static pat rule of preserving described binding NAT outgoing interface; The network address port mapping relations that deletion is set up with described unbundling static pat rule, execution in step two.
Also comprise after the described step 1:
Steps A: judge whether described bound NAT outgoing interface exists dynamic PAT rule, if, execution in step B then; Otherwise execution in step two;
Step B: judge the used TCP/UDP global port numbers of described binding NAT outgoing interface static pat rule whether in the used TCP/UDP global port numbers scope of described dynamic PAT rule, if, execution in step C then; Otherwise execution in step two;
Step C: judge whether described dynamic PAT rule has utilized described TCP/UDP global port numbers to set up the network address port mapping relations, if then delete described network address port mapping relations, execution in step two; Otherwise, direct execution in step two.
When the NAT outgoing interface of described bound router does not obtain the network address, preserve described binding NAT outgoing interface static pat rule, wait for that it obtains to set up behind network address and meet the network address port mapping relations of binding described router NAT outgoing interface static pat rule.
If lost efficacy in the network address that the NAT outgoing interface of described bound router obtains, then delete the network address port mapping relations of setting up with the network address of described inefficacy that meet the static pat rule of binding described router NAT outgoing interface, discharge used TCP/UDP global port numbers resource; If there is dynamic PAT rule in the NAT outgoing interface of described bound router, then utilize described TCP/UDP global port numbers to set up the network address port mapping relations that meet described dynamic PAT rule.
If the NAT outgoing interface of described bound router obtain the new network address, then delete the network address port mapping relations of setting up with the former network address that meet the static pat rule of binding described router NAT outgoing interface, set up the network address port mapping relations that meet the static pat rule of binding described router NAT outgoing interface with the described new network address then.
If deleted according to the network address port mapping relations that the static pat rule of described binding router NAT outgoing interface is set up, then its employed TCP/UDP global port numbers can be used by the pooled NAT rule.
Described network address port mapping relations are private network IP address, port and the IP address of router acquisition, the mapping relations of port.
A kind of system of binding router interface supported by static state PAT comprises public network DDNS server, router and private network http server, and described router is used for:
The static pat rule of its NAT outgoing interface of configuration binding;
Dynamically obtain the network address in the on-fixed mode;
Set up the network address port mapping relations;
To the destination address that receives is that himself interface network address and the TCP/UDP message that meets described network address port mapping relations carry out the network address port conversion.
Described router obtains revocable network address by dial mode.
The invention solves router interface and dynamically obtain under the situation of fixed network address not, the problem that the static pat rule can not multiplexing this interface network address has improved the utilance of interface IP address.The present invention can save the fixedly application of Internet IP address, has reduced the expense of networking, has improved the flexibility of using the NAT networking, and realizes simple.
Description of drawings
Fig. 1 is the method for the invention flow chart;
When Fig. 2 is the static pat rule conflict of static pat rule and the unbundling interface of multiplexing bound NAT outgoing interface address of binding NAT outgoing interface in the method for the invention, set up the flow chart of network address port mapping relations;
When Fig. 3 is the dynamic PAT rule conflict of static pat rule and the described NAT outgoing interface of binding of binding NAT outgoing interface in the method for the invention, set up the flow chart of network address port mapping relations;
Fig. 4 is to lose efficacy or the flow chart of the processing when changing in the network address of bound NAT outgoing interface in the method for the invention;
Fig. 5 is the networking schematic diagram of system of the present invention;
Fig. 6 is the flow chart of the first embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, be the method for the invention flow chart, may further comprise the steps:
S102: configuration router NAT incoming interface, NAT outgoing interface and the static pat rule of binding described NAT outgoing interface;
S104: set up the network address port mapping relations that meet the static pat rule of binding described router NAT outgoing interface according to the network address that the NAT outgoing interface of described bound router obtains; Described network address port mapping relations are private network IP address, port and the IP address of router acquisition, the mapping relations of port;
This method is the network address that the mode with static pat rule binding router interface realizes the multiplexing router interface, so whether have the network address not limit to router interface, do not obtain at interface under the situation of the network address, only need to preserve described rule earlier, interface has obtained can set up corresponding network address port mapping relations automatically behind the network address by the time; Obtained at interface under the condition of network address feelings, if the static pat rule of the unbundling interface of the network address that has described interface multiplexing, then its handling process as shown in Figure 2; If there is dynamic PAT rule in described bound NAT outgoing interface, then it is handled as shown in Figure 3; Lost efficacy in the network address of the router interface of being bound when the static pat transformation rule or when changing, the network address port mapping relations of its foundation also lost efficacy thereupon or changed, and concrete treating method as shown in Figure 4.
S106: described bound router NAT outgoing interface receives destination address when being the TCP/UDP message of its own interfaces network address, destination address and destination interface with described message are searched described network address port mapping relations, if have, then described message is carried out the network address port conversion by described network address port mapping relations; Otherwise, described message is handled as the local message of router.
Under the situation of the static pat rule that has disposed binding NAT outgoing interface, the NAT incoming interface does not need to carry out extra processing to the TCP/UDP message of receiving.
As shown in Figure 2, when being the static pat rule conflict of static pat rule and the unbundling interface of multiplexing bound NAT outgoing interface address of binding NAT outgoing interface in the method for the invention, set up the flow chart of network address port mapping relations, may further comprise the steps:
S202: after the static pat rule of configuration binding router NAT outgoing interface, the static pat rule of the unbundling interface that has the described NAT outgoing interface network address multiplexing;
S204: whether the static pat rule of judging described binding NAT outgoing interface conflicts with the static pat rule of described unbundling interface, if then carry out S206; Otherwise, carry out S208
S206: preserve the static pat rule of described binding NAT outgoing interface but temporarily do not come into force, deletion meets the network address port mapping relations of the static pat rule of unbundling interface, and the static pat taking effect rules of described binding NAT outgoing interface is carried out S208;
S208: the network address port mapping relations of setting up the static pat rule that meets described binding NAT outgoing interface.
As shown in Figure 3, when being the dynamic PAT rule conflict of static pat rule and the described NAT outgoing interface of binding of binding NAT outgoing interface in the method for the invention, set up the flow chart of network address port mapping relations, may further comprise the steps:
S302: after the static pat rule of configuration binding router NAT outgoing interface, have the dynamic PAT rule of the described NAT outgoing interface of binding;
S304: judge that the used TCP/UDP global port numbers of described binding router NAT outgoing interface static pat rule is whether in the used TCP/UDP global port numbers scope of described dynamic PAT rule, if then carry out S306; Otherwise carry out S308;
S306:: judge whether described dynamic PAT rule has utilized described TCP/UDP global port numbers to set up the network address port mapping relations, if, then delete described network address port mapping relations, reclaim used this overall situation TCP/UDP port numbers resource of pooled NAT rule; Carry out S308; Otherwise, directly carry out S308;
S308: the network address port mapping relations of setting up the static pat rule that meets described binding NAT outgoing interface.
As shown in Figure 4, be to lose efficacy or the flow chart of the processing when changing in the network address of bound NAT outgoing interface in the method for the invention, may further comprise the steps:
S402: lost efficacy or changed in the network address of bound NAT outgoing interface;
S404: the network address port mapping relations that meet the static pat rule of binding described router NAT outgoing interface that deletion is set up with the network address described inefficacy or that change discharge used TCP/UDP global port numbers resource;
If deleted according to the network address port mapping relations that the static pat rule of described binding router NAT outgoing interface is set up, then its employed TCP/UDP global port numbers can be used by the pooled NAT rule.
S406: the network address of judging the NAT outgoing interface is inefficacy or has obtained the new network address; If lost efficacy, then carried out S408; If obtained the new network address, then carry out S410;
S408:, then utilize described TCP/UDP global port numbers to set up the network address port mapping relations that meet described dynamic PAT rule if there is dynamic PAT rule in described bound NAT outgoing interface;
S410: set up the network address port mapping relations that meet the static pat rule of binding described router NAT outgoing interface with the described new network address;
As shown in Figure 5, be the networking schematic diagram of system of the present invention; Comprise outside public network, router and enterprise's private network.The NAT incoming interface of router links to each other with the enterprise private network, and the NAT outgoing interface links to each other with outside public network; Router is set up and being connected of outside public network in modes such as dialing, and then the network address that obtains of NAT outgoing interface is the on-fixed address.When binding the static pat function of NAT outgoing interface on configuration router, the function that the private network server is provided is mapped on the same port of NAT outgoing interface address.The private network server has fixedly domain name, under the situation of dynamic address acquisition, realizes the corresponding of new address and domain name by the DDNS function.As described in Figure 5, public network user wants to visit the server in the private network, and reference address that only need browser is set to domain name www.xxx.com.cn and gets final product.
As shown in Figure 6, be the flow chart of first embodiment of the invention, may further comprise the steps:
S602: the static pat function of on router, enabling binding NAT outgoing interface;
Wherein, S602 further comprises:
(1) enables nat feature, and the NAT attribute of router interface is set;
ip?nat?start
(2) the IP address and the NAT attribute of the interface link to each other with private network are set;
interface?fei_1/1
ip?address192.168.88.200255.255.255.0
ip?nat?inside
(3) the IP address and the NAT attribute of the interface link to each other with public network are set; And
interface?fei_2/1
ip?nat?outside
(4) the static pat rule of configuration binding NAT outgoing interface;
ip?nat?inside?source?static?tcp192.168.88.10180fei_2/180
S604: router is connected to outside public network by modes such as dialing, and NAT outgoing interface fei_2/1 obtains an Internet IP address 212.10.10.1; Corresponding with domain name www.xxx.com.cn finished by the DDNS service in this Internet IP address; Router is set up following address port mapping relations according to the rule of configuration;
Private net address/port public network address/port
192.168.88.101/80 212.10.10.1/80
S606: public network user obtains corresponding service by browser access domain name www.xxx.com.cn, and in data were passed on process, the conversion of IP address, port was to be undertaken by top mapping relations.
In sum, adopt method of the present invention to overcome under the situation that router interface dynamically obtains fixed address not, the shortcoming that the static pat rule can not multiplexing this interface IP address has improved the utilance of router interface address simultaneously.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for a binding router interface supported by static state PAT is characterized in that, described method comprises:
Step 1: the static pat rule of configuration binding router NAT outgoing interface;
Step 2: set up the network address port mapping relations that meet the static pat rule of binding described router NAT outgoing interface according to the network address that the NAT outgoing interface of described bound router obtains; The described network address is revocable network address;
Step 3: described bound router NAT outgoing interface receives destination address when being the TCP/UDP message of its own interfaces network address, destination address and destination interface with described message are searched described network address port mapping relations, if have, then described message is carried out the network address port conversion by described network address port mapping relations; Otherwise, described message is handled as the local message of router.
2. the method for binding router interface supported by static state PAT as claimed in claim 1 is characterized in that, also comprises after the described step 1:
Step a: judge whether to exist the static pat rule of unbundling interface of the network address of multiplexing described bound NAT outgoing interface, if, execution in step b then; Otherwise execution in step two;
Step b: whether the static pat rule of judging described binding NAT outgoing interface conflicts with the static pat rule of described unbundling interface, if, execution in step c then; Otherwise execution in step two;
Step c: the static pat rule of preserving described binding NAT outgoing interface; The network address port mapping relations that deletion is set up with described unbundling static pat rule, execution in step two.
3. the method for binding router interface supported by static state PAT as claimed in claim 1 is characterized in that, also comprises after the described step 1:
Steps A: judge whether described bound NAT outgoing interface exists dynamic PAT rule, if, execution in step B then; Otherwise execution in step two;
Step B: judge the used TCP/UDP global port numbers of described binding NAT outgoing interface static pat rule whether in the used TCP/UDP global port numbers scope of described dynamic PAT rule, if, execution in step C then; Otherwise execution in step two;
Step C: judge whether described dynamic PAT rule has utilized described TCP/UDP global port numbers to set up the network address port mapping relations, if then delete described network address port mapping relations, execution in step two; Otherwise, direct execution in step two.
4. the method for binding router interface supported by static state PAT as claimed in claim 1, it is characterized in that, when the NAT outgoing interface of described bound router does not obtain the network address, preserve described binding NAT outgoing interface static pat rule, wait for that it obtains to set up behind network address and meet the network address port mapping relations of binding described router NAT outgoing interface static pat rule.
5. the method for binding router interface supported by static state PAT as claimed in claim 1, it is characterized in that, if lost efficacy in the network address that the NAT outgoing interface of described bound router obtains, then delete the network address port mapping relations of setting up with the network address of described inefficacy that meet the static pat rule of binding described router NAT outgoing interface, discharge used TCP/UDP global port numbers resource; If there is dynamic PAT rule in the NAT outgoing interface of described bound router, then utilize described TCP/UDP global port numbers to set up the network address port mapping relations that meet described dynamic PAT rule.
6. as the method for claim 1 or 5 described binding router interface supported by static state PAT, it is characterized in that, if the NAT outgoing interface of described bound router obtain the new network address, then delete the network address port mapping relations of setting up with the former network address that meet the static pat rule of binding described router NAT outgoing interface, set up the network address port mapping relations that meet the static pat rule of binding described router NAT outgoing interface with the described new network address then.
7. the method for binding router interface supported by static state PAT as claimed in claim 1, it is characterized in that, if deleted according to the network address port mapping relations that the static pat rule of described binding router NAT outgoing interface is set up, then its employed TCP/UDP global port numbers can be used by the pooled NAT rule.
8. the method for binding router interface supported by static state PAT as claimed in claim 1 is characterized in that, described network address port mapping relations are private network IP address, port and the IP address of router acquisition, the mapping relations of port.
9. the system of a binding router interface supported by static state PAT comprises public network, router and private network, it is characterized in that, described router is used for:
The static pat rule of its NAT outgoing interface of configuration binding;
Dynamically obtain the network address in the on-fixed mode;
Set up the network address port mapping relations;
To the destination address that receives is that himself interface network address and the TCP/UDP message that meets described network address port mapping relations carry out the network address port conversion.
10. the system of binding router interface supported by static state PAT as claimed in claim 9 is characterized in that, described router obtains revocable network address by dial mode.
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| KR20130052240A (en) * | 2011-11-11 | 2013-05-22 | 삼성전자주식회사 | Method and apparatus for provisioning network address translator traversal methods |
| CN105897853A (en) * | 2015-12-29 | 2016-08-24 | 乐视云计算有限公司 | Peer-to-peer network connection method and device |
| CN109561164B (en) * | 2017-09-27 | 2021-02-09 | 华为技术有限公司 | NAT table entry management method and device and NAT equipment |
| CN113873503B (en) * | 2021-11-08 | 2023-12-15 | 深圳市共进电子股份有限公司 | Gateway bridging networking method, device and router |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1547354A (en) * | 2003-12-17 | 2004-11-17 | 港湾网络有限公司 | Optimization method for network address translation rule configuration |
| CN101159693A (en) * | 2007-10-16 | 2008-04-09 | 中兴通讯股份有限公司 | Static PAT supporting arbitrary port method of multiplexing router interface address |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1547354A (en) * | 2003-12-17 | 2004-11-17 | 港湾网络有限公司 | Optimization method for network address translation rule configuration |
| CN101159693A (en) * | 2007-10-16 | 2008-04-09 | 中兴通讯股份有限公司 | Static PAT supporting arbitrary port method of multiplexing router interface address |
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