CN101175030A - Method for implementing proxy to multiple isomorphic subnets - Google Patents
Method for implementing proxy to multiple isomorphic subnets Download PDFInfo
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- CN101175030A CN101175030A CNA2006101504595A CN200610150459A CN101175030A CN 101175030 A CN101175030 A CN 101175030A CN A2006101504595 A CNA2006101504595 A CN A2006101504595A CN 200610150459 A CN200610150459 A CN 200610150459A CN 101175030 A CN101175030 A CN 101175030A
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Abstract
The present invention provides a method for realizing the proxy of a plurality of isomorphic subnets; the present invention comprises the following steps that host proxies of different internal networks are set; a network address converting map table in which one data packet of an internal network address information and an external network address information is set; the network address converting map table gets the corresponding address according to the internal or external network address information when the host proxy receives a data packet for network application; the head of the application protocol of the data packet is amended according to the corresponding address and then calculated and checked again to emit the data packet to the corresponding network. In this way, the visit of a user to a plurality of isomorphic subnets can be realized at the same time.
Description
Technical field
The present invention relates to a kind of method, more specifically, relate to the method that the user visits simultaneously to a plurality of isomorphic subnets of depositing the IP conflict mutually in communication network a plurality of isomorphic subnets realization agencies.
Background technology
Isomorphic subnets has following implication: each subnet has identical characteristic and character at aspects such as physical connection and network realizations; Different isomorphic subnets has the identical network segment, has the IP address of repeating.
Intranet is represented the single isomorphic subnets in the homogeneous network, and outer net refers to an external public network that is different from homogeneous network.
Symmetrical network and dissymmetric network are represented two kinds of network environments respectively.Symmetrical network is represented: Intranet and outer net all are provided with the network environment that destination network segment arrives agency's route.Dissymmetric network is represented: have only outer net to be provided with the network environment of destination network segment to agency's route.In symmetrical network, main frame in the Intranet and external user can initiatively be visited mutually.In dissymmetric network, acted on behalf of the influence of route, can initiatively visit the Intranet except external user, the main frame in the Intranet can not initiatively be visited external user.
A plurality of isomorphic subnets are formed homogeneous network environments.In homogeneous network environments, consider the problem of IP address conflict, the user can not insert different subnet environment simultaneously, thereby, can not visit a plurality of isomorphic subnets simultaneously.
Summary of the invention
For convenience the user conducts interviews simultaneously to a plurality of isomorphic subnets, the present invention proposes a kind of isomorphic subnets agency's of the address transition principle Network Based device of implementation method.
The present invention adopts a normal hosts that connects an Intranet and outer net respectively to act on behalf of as an Intranet; Each agency is remapped to the Intranet network segment, and external user uses mapping back network segment visit Intranet.Visit when realizing a plurality of isomorphism Intranet, the present invention need be provided with independent agency for each Intranet, needs simultaneously to guarantee that a plurality of agencies are mapped to the Intranet network segment on the different outer net network segments.Based on above-mentioned principle, external user uses the IP address of the mapping network segment, the visit when agency by each Intranet correspondence realizes a plurality of isomorphic subnets.
For the packet that can make the mapping network segment can be routed to the agency, external user need be provided with the route of each Intranet mapping network segment to the agency before a plurality of Intranets of visit.In addition, also be provided with relevantly to the address conversion method of using the protocol data bag among the present invention, will see exactly whether Intranet has disposed the route of the outer net network segment to the agency with the Intranet route.
Mainly used symmetrical network and dissymmetric network to represent two kinds of network environments among the present invention.In the case, master agent realizes the implementation method of outer net to the transparent transfer of Intranet to the port related protocol, and IP address conversion method wherein is applicable to that also the transfer of port independent protocol realizes.
One aspect of the present invention provides a kind of a plurality of isomorphic subnets has been realized agency's method, it is characterized in that, may further comprise the steps: for a plurality of different Intranets are provided with separately master agent respectively; The network address translation mapping table is set, and wherein each list item is deposited the Intranet address information and the outer net address information of a packet; Master agent when receiving the packet of a network application, according to the interior net address in the packet or outer net address search network address translation mapping table to obtain corresponding address; And according to corresponding address, revise the heading of the application protocol of packet, recomputate verification and, and packet sent on the map network.
According to an aspect of the present invention, Intranet address information and outer net address information comprise: source IP address, source port, purpose IP address and destination interface.
According to according to the present invention a plurality of isomorphic subnets are realized that agency's method is further comprising the steps of: when master agent is received packet from outer net, if in the network address translation mapping table, do not find occurrence, then master agent generates new Intranet address information according to first mapping ruler, and the Intranet address information and the outer net address information of packet added in the network address translation mapping table as a new list item, if in the network address translation mapping table, found occurrence, net address in then directly obtaining.
Wherein, when master agent is received packet from outer net, corresponding implementation method also comprises: if network is a dissymmetric network, then according to the Intranet address information Network Search address transition mapping table in the packet, if find occurrence, then directly extract corresponding outer net address information, otherwise turn back to the step that receives packet; And if network is a symmetrical network, then according to the Intranet address information Network Search address transition mapping table in the packet, if find occurrence, then directly extract corresponding outer net address information, otherwise, generate new outer net address information according to second mapping ruler, add to then in the network address translation mapping table.
According to an aspect of the present invention, when network is under the asymmetric situation, first mapping ruler refers to: the source IP address after the conversion is the IP address of proxy on the Intranet network segment; Source IP address after the conversion is the IP address of proxy on the Intranet network segment; Source port after the conversion is for acting on behalf of at the interior online newly-generated port with uniqueness.
Be under the symmetric case and work as network, first rule refers to: the purpose IP address after the conversion belongs to the Intranet network segment, and host number is preceding consistent with conversion.
In addition, in the present invention, second rule refers to: the source IP address after the conversion belongs to the network segment that is mapped to outer net from Intranet, and host number is preceding consistent with conversion.
Another aspect of the present invention provides a kind of a plurality of isomorphic subnets are realized agency's device, it is characterized in that, comprising: the agency is provided with the unit, is used to a plurality of different Intranets that separately master agent is set respectively; Mapping table is provided with the unit, is used to be provided with a network address translation mapping table, and wherein each list item is deposited the Intranet address information and the outer net address information of a packet; Search the unit, be used in master agent when receiving the packet of a network application, according to the interior net address in the packet or outer net address search network address translation mapping table to obtain corresponding address; And transmitting element, be used for according to corresponding address, revise the heading of the application protocol of packet, recomputate verification and, and packet sent on the map network.
Wherein, Intranet address information and outer net address information comprise: source IP address, source port, purpose IP address and destination interface.
In addition, the device to a plurality of isomorphic subnets realization agencies according to the embodiment of the invention also comprises interpolation/acquiring unit, be used for when master agent is received packet from outer net, if in the network address translation mapping table, do not find occurrence, then master agent generates new Intranet address information according to first mapping ruler, and the Intranet address information and the outer net address information of packet added in the network address translation mapping table as a new list item, if in the network address translation mapping table, found occurrence, net address in then directly obtaining.
Wherein, when master agent is received packet from Intranet, search the unit and also be used for following two aspects:
First aspect if network is a dissymmetric network, then according to the Intranet address information Network Search address transition mapping table in the packet, if find occurrence, is then directly extracted corresponding outer net address information, otherwise is turned back to the step that receives packet; And
Second aspect, if network is a symmetrical network, then according to the Intranet address information Network Search address transition mapping table in the packet, if find occurrence, then directly extract corresponding outer net address information, otherwise, generate new outer net address information according to second mapping ruler, add to then in the network address translation mapping table.
In an embodiment of the present invention, when network is under the asymmetric situation, first mapping ruler is: the source IP address after the conversion is the IP address of proxy on the Intranet network segment; Purpose IP address after the conversion belongs to the Intranet network segment, and host number is consistent before conversion; And the source port after the conversion is for acting on behalf of at the interior online newly-generated port with uniqueness.And be in when network under the situation of symmetry, first mapping ruler refers to: the purpose IP address after the conversion belongs to the Intranet network segment, and host number is preceding consistent with conversion.
In addition, in an embodiment of the present invention, second rule refers to: the source IP address after the conversion belongs to the network segment that is mapped to outer net from Intranet, and host number is preceding consistent with conversion.
Thereby the isomorphic subnets agency who realizes by the present invention has had following two advantages:
(1) agency has autgmentability preferably to the function treatment of using agreement; And
(2) external user can be visited a plurality of isomorphic subnets of depositing the IP conflict mutually simultaneously.
Description of drawings
Fig. 1 realizes the flow chart of agency's method according to the embodiment of the invention to a plurality of isomorphic subnets;
Fig. 2 is the flow chart according to the processing of the agency's of the embodiment of the invention outer net packet;
Fig. 3 is the flow chart of the processing of the intranet data bag acted on behalf of in the dissymmetric network according to the embodiment of the invention;
Fig. 4 is the flow chart of the processing of the intranet data bag acted on behalf of in the symmetrical network according to the embodiment of the invention;
Fig. 5 is a block diagram of in accordance with another embodiment of the present invention a plurality of isomorphic subnets being realized agency's device; And
Fig. 6 is based on the view of the network composition of master agent.
Embodiment
Below with reference to accompanying drawing embodiments of the invention are described.
Fig. 1 realizes the flow chart of agency's method according to the embodiment of the invention to a plurality of isomorphic subnets.As shown in Figure 1, a plurality of isomorphic subnets are realized agency's method comprises: S102, for a plurality of different Intranets are provided with separately master agent respectively; S104 is provided with the network address translation mapping table, and wherein each list item is deposited the Intranet address information and the outer net address information of a packet; S106, master agent when receiving the packet of a network application, according to the interior net address in the packet or outer net address search network address translation mapping table to obtain corresponding address; And S108, according to corresponding address, revise the heading of the application protocol of packet, recomputate verification and, and packet sent on the map network.
Wherein, Intranet address information and outer net address information comprise source IP address, source port, purpose IP address and destination interface.
In addition, when master agent is received packet from outer net, as shown in Figure 2, a plurality of isomorphic subnets realize that agency's method also comprises: if do not find occurrence in the network address translation mapping table, then master agent generates new Intranet address information according to first mapping ruler, and the Intranet address information and the outer net address information of packet added in the network address translation mapping table as a new list item, if in the network address translation mapping table, found occurrence, net address in then directly obtaining.
Fig. 2 is the flow chart according to the processing of the agency's of the embodiment of the invention outer net packet.This process all is identical for symmetrical network and dissymmetric network, and just address conversion method is variant.Process as shown in Figure 2 comprises: S201, intercept and capture destination address and belong to the outer net packet that Intranet is mapped to the outer net network segment; S202, according to the outer net address information of packet, Network Search address transition mapping table; S203 if find occurrence, then directly takes out corresponding Intranet address information; S204 if do not find occurrence, according to the conversion method of following table 1 and table 2, generates new Intranet address information so, adds in the network address translation mapping table; S205 according to the Intranet address information that obtains, revises the header literary composition of application protocol, recomputate verification and; And S206, packet is sent to interior online.
Table 1:
| The address information of outer net input packet | The new address information of conversion back Intranet output packet | |
| Source IP address | OutterSrcIp | The InnerSrcIp=proxy is in interior online IP address |
| Source port | OutterSrcPort | The new interior online port numbers of creating of InnerSrcPort=agency |
| Purpose IP address | OutterDstIp | InnerDstIp＝(OutterDstIp &～ Mask)|InnerNet |
| Destination interface | OutterDstPort | InnerDstPort＝OutterDstPort |
Wherein, Mask is the subnet mask of Intranet, and InnerNet is an inner-mesh network number.
Table 2
| The address information of outer net input packet | The new address information of conversion back Intranet output packet | |
| Source IP address | OutterSrcIp | InnerSrcIp＝OutterSrcIp |
| Source port | OutterSrcPort | InnerSrcPort＝OutterSrcPort |
| Purpose IP address | OutterDstIp | InnerDstIp＝(OutterDstIp &～ Mask)|InnerNet |
| Destination interface | OutterDstPort | InnerDstPort＝OutterDstPort |
Equally, Mask is the subnet mask of Intranet, and InnerNet is an inner-mesh network number.
Fig. 3 is the flow chart of the processing of the intranet data bag acted on behalf of in the dissymmetric network according to the embodiment of the invention.Wherein, may further comprise the steps: S301, intercepting and capturing destination address is the intranet data bag of proxy in Intranet IP address; S302 searches the NAT mapping table according to the Intranet address information of packet; S303 if find occurrence, then directly takes out corresponding outer net address information, if do not find occurrence, does not then deal with, and the data that turn back to S301 are intercepted and captured step; S304 revises the heading of application protocol according to checking result, recomputate verification and; And S305, packet is sent to outer online.
Fig. 4 is the flow chart of the processing of the intranet data bag acted on behalf of in the symmetrical network according to the embodiment of the invention.It may further comprise the steps: S401, intercept and capture the intranet data bag that destination address belongs to the outer net network segment; S402 searches the NAT mapping table according to the Intranet address information of packet; S403 if find occurrence, then directly takes out corresponding outer net address information; S404 if do not find occurrence, then according to the conversion method of table 3, generates new outer net address information, adds in the NAT mapping table; S405 according to the above-mentioned outer net address information that obtains, revises the heading of application protocol, recomputate verification and; And S406, packet is sent to outer online.
Table 3
| The address information of Intranet input packet | The new address information of conversion back outer net output packet | |
| Source IP address | InnerSrcIp | OutterSrcIp＝(InnerSrcIp &～Mask)| InnerMappedNet |
| Source port | InnerSrcPort | OutterSrcPort＝InnerSrcPort |
| Purpose IP address | InnerDstIp | OutterDstIp＝InnerDstIp |
| Destination interface | InnerDstPort | OutterDstPort＝InnerDstPort |
Identical with table 1 and table 2, Mask represents the subnet mask of Intranet, and InnerMappedNet represents that Intranet is mapped to the network number of outer net.
Fig. 5 is a block diagram of in accordance with another embodiment of the present invention a plurality of isomorphic subnets being realized agency's device 500.Wherein, device 500 comprises: the agency is provided with unit 502, is used to a plurality of different Intranets that separately master agent is set respectively; Mapping table is provided with unit 504, is used to be provided with a network address translation mapping table, and wherein each list item is deposited the Intranet address information and the outer net address information of a packet; Search unit 506, be used in master agent when receiving the packet of a network application, according to the interior net address in the packet or outer net address search network address translation mapping table to obtain corresponding address; And transmitting element 508, be used for according to corresponding address, revise the heading of the application protocol of packet, recomputate verification and, and packet sent on the map network.
Wherein, net address information comprises source IP address, source port, purpose IP address and destination interface.
In addition, device 500 also comprises interpolation/acquiring unit 510, be used for when master agent is received packet from outer net, if in the network address translation mapping table, do not find occurrence, then master agent generates new Intranet address information according to first mapping ruler (reference table 1 and table 2), and the Intranet address information and the outer net address information of packet added in the network address translation mapping table as a new list item, if in the network address translation mapping table, found occurrence, net address in then directly obtaining.
When master agent is received packet from Intranet, searching unit further is used for: if when network is dissymmetric network, according to the Intranet address information Network Search address transition mapping table in the packet, if find occurrence, then directly extract corresponding outer net address information, otherwise turn back to the step that receives packet; And when network is symmetrical network, according to the Intranet address information Network Search address transition mapping table in the packet, if find occurrence, then directly extract corresponding outer net address information, otherwise, generate new outer net address information according to second mapping ruler (reference table 3), add to then in the network address translation mapping table.
Fig. 6 is based on the view of the network composition of master agent.As shown in Figure 6, the embodiment of the invention has adopted following configuration: a normal hosts that connects an Intranet and outer net is respectively acted on behalf of as an Intranet; Each agency is remapped to the Intranet network segment, and external user uses mapping back network segment visit Intranet.
Visit when realizing a plurality of isomorphism Intranet, the present invention need be provided with independent agency for each Intranet, needs simultaneously to guarantee that a plurality of agencies are mapped to the Intranet network segment on the different outer net network segments.Based on above-mentioned principle, external user uses the IP address of the mapping network segment, the visit when agency by each Intranet correspondence realizes a plurality of isomorphic subnets.
Thereby, by implementing the present invention, can make the agency that the function treatment of using agreement is had better expansion row, and external user can visit a plurality of isomorphic subnets of depositing the IP conflict mutually simultaneously, thereby realize agency a plurality of isomorphic subnets.
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 (7)
1. the method that a plurality of isomorphic subnets are realized acting on behalf of is characterized in that, may further comprise the steps:
Step S102 is for a plurality of different Intranets are provided with separately master agent respectively;
Step S104 is provided with the network address translation mapping table, and wherein each list item is deposited the Intranet address information and the outer net address information of a packet;
Step S106, described master agent when receiving the packet of a network application, according to the interior net address in the described packet or the described network address translation mapping table of outer net address search to obtain corresponding address; And
Step S108 according to described corresponding address, revises the heading of the application protocol of described packet, recomputate verification and, and described packet sent on the map network.
2. the method to a plurality of isomorphic subnets realization agencies according to claim 1 is characterized in that described Intranet address information and described outer net address information comprise: source IP address, source port, purpose IP address and destination interface.
3. the method to a plurality of isomorphic subnets realization agencies according to claim 1 and 2 is characterized in that, and is further comprising the steps of:
When described master agent is received described packet from described outer net, if in described network address translation mapping table, do not find occurrence, then described master agent generates new Intranet address information according to first mapping ruler, and the Intranet address information and the outer net address information of described packet added in the described network address translation mapping table as a new list item, if in described network address translation mapping table, found described occurrence, then directly obtain described interior net address.
4. according to claim 1 and 2 a plurality of isomorphic subnets are realized agency's method, it is characterized in that, when described master agent is received described packet from described Intranet, further comprising the steps of:
If described network is a dissymmetric network, then search described network address translation mapping table according to the Intranet address information in the described packet, if find occurrence, then directly extract corresponding outer net address information, otherwise turn back to the step that receives described packet; And
If described network is a symmetrical network, then search described network address translation mapping table according to the Intranet address information in the described packet, if find occurrence, then directly extract corresponding outer net address information, otherwise, generate new outer net address information according to second mapping ruler, add to then in the described network address translation mapping table.
5. according to claim 3 a plurality of isomorphic subnets are realized agency's method, it is characterized in that when network is under the asymmetric situation, described first mapping ruler is:
Described source IP address after the conversion is the IP address of described proxy on the Intranet network segment;
Described purpose IP address after the conversion belongs to the described Intranet network segment, and host number is consistent before conversion; And
Source port after the conversion is described agency online newly-generated port with uniqueness in described.
6. the method to a plurality of isomorphic subnets realization agencies according to claim 3 is characterized in that be in when network under the situation of symmetry, described first mapping ruler is:
Described purpose IP address after the conversion belongs to the Intranet network segment, and host number is preceding consistent with conversion.
7. the method to a plurality of isomorphic subnets realization agencies according to claim 4 is characterized in that described second mapping ruler is:
Described source IP address after the conversion belongs to the network segment that is mapped to described outer net from described Intranet, and host number is preceding consistent with conversion.
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| CN102394927A (en) * | 2011-10-31 | 2012-03-28 | 国云科技股份有限公司 | Method for storing and synchronizing data of internal and external networks |
| CN104363235A (en) * | 2014-11-20 | 2015-02-18 | 成都博高科技有限责任公司 | Communication method, device and system and communication channel establishing method and device |
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| CN108418884A (en) * | 2018-03-09 | 2018-08-17 | 北京奇艺世纪科技有限公司 | A kind of method, apparatus and electronic equipment of transmission services data |
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| CN102394927A (en) * | 2011-10-31 | 2012-03-28 | 国云科技股份有限公司 | Method for storing and synchronizing data of internal and external networks |
| CN102394927B (en) * | 2011-10-31 | 2015-01-14 | 国云科技股份有限公司 | Method for storing and synchronizing data of internal and external networks |
| CN104363235A (en) * | 2014-11-20 | 2015-02-18 | 成都博高科技有限责任公司 | Communication method, device and system and communication channel establishing method and device |
| CN105163062A (en) * | 2015-06-16 | 2015-12-16 | 浙江宇视科技有限公司 | System and method for accessing social resources to public platform |
| CN105163062B (en) * | 2015-06-16 | 2018-09-14 | 浙江宇视科技有限公司 | A kind of system and method that social resources are linked into common platform |
| CN108418884A (en) * | 2018-03-09 | 2018-08-17 | 北京奇艺世纪科技有限公司 | A kind of method, apparatus and electronic equipment of transmission services data |
| CN109218467A (en) * | 2018-11-15 | 2019-01-15 | 锐捷网络股份有限公司 | A kind of method for network address translation and chip |
| CN109218467B (en) * | 2018-11-15 | 2022-02-25 | 锐捷网络股份有限公司 | Network address conversion method and chip |
| CN111064742A (en) * | 2019-12-28 | 2020-04-24 | 杭州安恒信息技术股份有限公司 | Method, device and related equipment for realizing intranet access based on network agent |
| CN111064742B (en) * | 2019-12-28 | 2022-07-05 | 杭州安恒信息技术股份有限公司 | Method, device and related equipment for realizing intranet access based on network agent |
| CN111371763A (en) * | 2020-02-26 | 2020-07-03 | 高新兴科技集团股份有限公司 | Network penetration access method and system for pictures, storage medium and electronic equipment |
| CN111371763B (en) * | 2020-02-26 | 2022-07-05 | 高新兴科技集团股份有限公司 | Network penetration access method and system for pictures, storage medium and electronic equipment |
| CN115277884A (en) * | 2022-07-14 | 2022-11-01 | 苏州盛科通信股份有限公司 | Subnet replacement method and device, exchange chip, electronic equipment and storage medium |
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