CN1893394A - Method for passing through network address conversion - Google Patents
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- CN1893394A CN1893394A CNA200510082903XA CN200510082903A CN1893394A CN 1893394 A CN1893394 A CN 1893394A CN A200510082903X A CNA200510082903X A CN A200510082903XA CN 200510082903 A CN200510082903 A CN 200510082903A CN 1893394 A CN1893394 A CN 1893394A
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Abstract
The method includes steps: after receiving IP message of user's logon request sent from user terminal UE, SBGF entity obtains IP address/port of source; after carrying out NAT address conversion for IP message head, SBGF entity sends it to AF entity; AF entity obtains IP address/port of user and address/port of IP message converted by SBGF entity carried by load of message; after successful logon, AF entity saves address/port of IP message converted by SBGF entity, and sends IP address/port of user carried by message load to SBGF entity; SBGF entity compares IP address of source in user logon message with information of user's IP address/port carried in message load sent from the AF entity; if not identical, then it is determined that there is NAT equipment existed between UE and SBGF entity; sending keep alive message of NAT to UE regularly. The method lighten handling burden for AF.
Description
Technical field
The present invention relates to the Packet Service technical field, be meant the method for based traversal network address translation function (NAT) in a kind of packet service network especially.
Background technology
Owing to reasons such as shortage of ip address or security considerations, access network and enterprise network export deployment a large amount of NAT device, these NAT device are that operator or enterprise have saved a large amount of IP addresses, make various data services to carry out normally, but simultaneously because the existence of NAT device causes session service to carry out normally.This mainly is because NAT device has changed the IP address of message, isolated different address fields simultaneously, and the address of the Media Stream that identifies in the signaling message remains original private IP address, and media stream message can't be transmitted normally after the result caused session to be set up, and can't communicate.The problems referred to above then are called as the problem that NAT passes through, IMS network application at present is in fixed access network network environment the time, have a very big problem is exactly how to solve the NAT crossing problem, certainly this problem exists under some wireless network environment equally, but owing to a large amount of NAT is present in the fixed network, so this problem is more outstanding in fixed network is used.
Because the position difference that NAT exists is divided into two kinds of situations: a kind of NAT of being is positioned at the network boundary of operator, finishes the NAT translation function by the equipment of operator; Another kind is that NAT is positioned at the user side network environment, and promptly between user terminal and carrier network entity, this mode is called as HostedNAT.
At present, in the existing IMS network Hosted NAT to pass through the scheme basic ideas as follows:
Figure 1 shows that the network model of existing Hosted NAT.As can be seen from Figure 1, user terminal communicates by client network and carrier network.Comprise NAT device in the client network, comprise P-CSCF, BGF and IMS/NGN network in the carrier network.
Referring to shown in Figure 2, under networking structure shown in Figure 1, the registration process of existing Hosted NAT is as follows:
Step 201: user side sends the IP message of user's register requirement to P-CSCF.
After step 202:P-CSCF receives the IP message of user's register requirement that user side sends, user's IP address/the port information that carries in source IP address and the message load in the IP heading in this IP message relatively, whether consistent, if it is consistent, then thinking does not have NAT device between user side and the P-CSCF, and if execution in step 203 is inconsistent, then thinking has NAT device between user side and the P-CSCF, execution in step 203.
Here, the user's IP address/port information that carries in the message load is the user's domain name address information that writes down in Contact address in the message or the Via header field.
Step 203～208:P-CSCF sends user's register requirement by BGF to network side, and obtains register requirement message response message alternately with other network entity of network side, returns the register requirement message to user side then.If user registration success; and in step 203, determine to have under the situation of NAT device between user side and the P-CSCF; P-CSCF preserves through the address after the NAT device conversion; comprise source and destination address/port; this address that to preserve again is as the Contact address of user side; and regularly sending the keep-alive message to user side, this NAT device upgrades the NAT list item of this user side of self preserving when transmitting the keep-alive message.
From said process as can be seen; P-CSCF is as the signalling processing equipment of concentrating; can support that jumbo user terminal inserts; if P-CSCF periodically inserts the user to all these and sends the keep-alive message; the largest interval of phase is about 10 minutes weekly; to bring great performance burden to the inter-process of P-CSCF.
In addition, the applicant has proposed a kind of networking structure in application number is 200510068227.0 application.This networking structure is referring to shown in Figure 3, and this networking structure comprises: first network, second network, signaling controlled function entity and several signaling static conversion functional entitys.Network A shown in the figure is first network, and network B is second network.Wherein, signaling controlled function entity links to each other with network B, signaling static conversion functional entity, and each signaling static conversion functional entity links to each other with network A, network B and signaling controlled function entity.Signaling static conversion functional entity can be the logic entity in the medium forwarding capability entity, also can be physical entity independently.
Signaling static conversion functional entity is mainly finished the NAT conversion of signaling, the keep-alive of NAT list item, and the flow control of signaling, and control interface is arranged between the P-CSCF.The signaling message that is used for transmission network A and signaling controlled function inter-entity.When signaling static conversion functional entity first among the transmission network A during signaling message of a user terminal, when being the register requirement of a user terminal in the network A, the NAT list item that needs this user terminal signaling message in the dynamic creation network A, as: the IP address of this user terminal in first network and the corresponding relation of the own IP address allocated/port of signaling static conversion functional entity, be used for the signaling message from first network or signaling capability controlled entity that after this receives is carried out the NAT address transition, and then realize the forwarding of signaling message.Further, signaling static conversion functional entity is finished the keep-alive of the NAT list item that self message preserves according to the signaling keep-alive message of signaling controlled function entity, and the flow control of signaling etc.
Signaling controlled function entity is used for the signaling message that receives is carried out analyzing and processing, and carries out Signalling exchange with functional entity in the network B.Receive the signaling message of the next register requirement of signaling static conversion functional entity forwarding when signaling controlled function entity after, obtain User Identity in the infomational message, and preserve the corresponding relation of source IP address/port numbers in User Identity and this signaling message, here, source IP address/port numbers is the own IP address allocated/port numbers of signaling static conversion functional entity.
Under above-mentioned networking situation; owing to have NAT device in the carrier network; be to need to carry out the NAT conversion among the BGF; because Application Function; as P-CSCF; as centralized big capacity control equipment; consider from the angle of networking and safety; P-CSCF can be positioned at the central machine room of carrier network usually; and can not be positioned at network boundary; the signalling path between NAT and the P-CSCF may can't be set up in the network of operator in the client network at this moment, therefore, possibly can't make the signaling message cross-over NAT equipment in above-mentioned networking.For convenience of description, the entity that below will finish signaling static conversion functional entity function in the above-mentioned networking is called signaling Border Gateway Function (SBGF), this SBGF can be a physical entity independently, also can be used as logic entity exists in the physical entity between any Access Network and core net, such as BGF.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of method of based traversal network address translation function, make it can reduce the burden of Application Function.
The method of a kind of based traversal network address translation function provided by the invention is achieved in that
A. user terminal sends the IP message of user's register requirement to the SBGF entity by access network, after the SBGF entity is received this IP message, obtain the source IP address/port in the IP heading in this IP message, and the IP heading of this IP message is carried out sending to after the NAT address transition Application Function in the packet service network; 9
B. after Application Function is received this IP message, IP message address/port after obtaining the user's IP address/port information that carries in the message load of this IP message and passing through the conversion of SBGF entity, and by obtaining the IP message that user's register requirement responds alternately with packet service network;
C. Application Function is judged whether success of registration according to the IP message of this user's register requirement response, if succeed in registration, then preserves the IP message address/port after the conversion of SBGF entity and the corresponding relation of this user terminal user ID among the step b; And, the user's IP address/port information that carries in the message load in this IP message that obtains among the step b is sent to the SBGF entity;
User's IP address/the port information that carries in the message load that the d.SBGF entity sends source IP address/port of obtaining among the step a and Application Function compares; if it is inconsistent; then determine to have NAT device between user terminal and the SBGF entity; then regularly send NAT keep-alive message to this user terminal, described NAT device upgrades the NAT list item that self preserves when transmitting this NAT keep-alive message to this user terminal.
The user domain name addresses of the user's IP address/port information that carries in the described message load for writing down in Contact address in this IP message or the Via header field.
Further comprise in step b: SBGF creates network address translation NAT list item, and after in step c, succeeding in registration, notice SBGF entity user succeeds in registration, after SBGF receives the notice that succeeds in registration in the steps d, preserve the NAT list item of creating for this user terminal among the step a, after steps d, further comprise:
E1, Application Function are received the signaling message of packet service network, and the corresponding relation that utilizes step to preserve from c obtains the IP message address/port after the conversion of SBGF entity, and this signaling message is transmitted to the SBGF entity;
E2, SBGF entity change the IP message address/port of this signaling message according to the NAT list item of self preserving, and the IP message of reference address/port is sent to user terminal;
When e3, NAT device transmit the IP message of step e2, utilize the NAT list item of self preserving to be transmitted to user terminal.
Described access network is the network of xDSL, Wlan, Cable, WiMax and wireless access way.
Described packet service network is IP Multimedia System IMS, or the NGN network.
When NGN was the communication network of ITU-T definition, described Application Function was a service control proxy function SCPF entity.
When packet network was IMS, described Application Function was an agent call interactive function P-CSCF entity.
Described access network or packet service network adopt IPv4 address format, IPv6 address format.
Described SBGF entity is physical entity independently, or is the logic entity among the BGF, or is the logic entity in the gateway device between Access Network and core net.
Method of the present invention is applied in the system of the Border Gateway Function SBGF entity that comprises packet service network, access network and connect packet service network and access network, and this SBGF entity has the NAT address translation feature.When the present invention realizes that in this system Hosted NAT passes through; judge whether to exist the mode of Hosted NAT by SBGF; and initiate the keep-alive message of HostedNAT list item by the SBGF that is positioned at the border; rather than initiate by AF; initiate as the P-CSCF that mentions in the prior art; therefore the present invention can guarantee that the signalling path between user and the network side exists all the time, has alleviated the processing burden of AF and the flow that alleviates network.
And, because in the applied networking, signaling controlled function entity does not directly link to each other with access network, promptly do not provide the direct interface with access network, so the user signaling message must pass through SBGF and could arrive signaling controlled function entity.Therefore, can reduce the malicious attack of user, make whole system safer network signal controlled function entity.Simultaneously, the present invention can also adapt to address situation complicated in the actual various networking very flexibly, satisfies the networking demand of different operators, and fail safe is higher.
Description of drawings
Fig. 1 is the network model of Hosted NAT in the prior art;
Fig. 2 is user's register flow path schematic diagram of realizing Hosted NAT based on model shown in Figure 1;
Fig. 3 is a kind of networking structure schematic diagram of the prior art;
Fig. 4 is the network model based on Hosted NAT shown in Figure 3;
Fig. 5 realizes user's register flow path schematic diagram of Hosted NAT under network model shown in Figure 4 for the present invention;
Fig. 6 is the specific embodiment of network model of the Hosted NAT of Fig. 4;
Fig. 7 is user's register flow path schematic diagram that the network model shown in shown in Figure 6 is realized Hosted NAT down.
Embodiment
The applied group-network construction of the present invention is based on networking framework shown in Figure 3.Fig. 4 is the network model based on Hosted NAT shown in Figure 3.The network architecture among Fig. 4 comprises access network, comprise Application Function packet service network, user terminal, the SBGF of (AF).Wherein, SBGF is the NAT conversion with signaling,, the entity of the keep-alive of NAT list item, access network is the network A among Fig. 3, the packet service network among Fig. 4 is the network B among Fig. 3.Has NAT device in the access network, i.e. Hosted NAT.Access network can be the Access Network of various access waies, as xDSL, Wlan, Cable, WiMax and wireless network.Packet service network can be IMS network, NGN network.Such as, the NGN network of ITU-T, TISPAN definition.Access network can use different address formats such as IPv4 or IPv6 with packet service network.And described SBGF entity is physical entity independently, or is the logic entity among the BGF, or is the logic entity in the gateway device between Access Network and core net.
In the NGN network architecture of ITU-T definition, above-mentioned AF and SBGF are SCPF and BGF; In the NGN network architecture of TISPAN definition, above-mentioned AF and SBGF are AF and Access Border Gateway Function, or are AGCF and GW etc.
Based on the networking structure of Fig. 4, and, realize that method of the present invention may further comprise the steps referring to shown in Figure 5:
Step 500: user terminal sends the IP message of user's register requirement to the SBGF entity by access network.
After step 501:SBGF entity is received this IP message, obtain the source IP address/port in the IP heading in this IP message, create network address translation NAT list item, and this IP message is carried out sending to after the NAT address transition AF entity in the packet service network.
After step 502:AF entity is received the IP message of BGF entity transmission, obtain the IP address/port information that carries in the message load in this IP message, and through the IP message address/port after the conversion of SBGF entity, and by obtaining the IP message that user's register requirement responds alternately with packet service network.Step 503:AF entity judges according to the IP message of this user's register requirement response whether registration is successful, if succeed in registration, then preserve the IP message address/port after the BGF entity conversion and the corresponding relation of this user terminal user ID, execution in step 504, if unsuccessful, AF issues the deletion indication to the SBGF entity, and after this SBGF entity is indicated according to this, delete the NAT list item of this user terminal correspondence of self preserving, and process ends.User ID can be a Subscriber Number.
Step 504:AF entity notice SBGF entity user succeeds in registration, and the user's IP address/port information that carries in the message load that obtains in the step 502 is sent to the BGF entity.
Step 505:SBGF entity is preserved the NAT list item of creating for this user terminal in the step 401, and the user's IP address/port information that carries in the message load according to source IP address/port that obtains in the step 501 and AF transmission compares, if it is inconsistent, then determine to have NAT device between user terminal and the BGF entity, if execution in step 506 consistent, is then determined to have NAT device between user terminal and the BGF entity, handle process ends according to existing procedure.
Step 506:SBGF entity regularly sends NAT keep-alive message to this user terminal, and described NAT device upgrades the NAT list item that self preserves when transmitting this NAT keep-alive message to this user terminal.
In networking structure shown in Figure 3, if carrier network is the IMS/NGN network, then above-mentioned packet service network is the P-CSCF in the IMS/NGN network, referring to shown in Figure 6.
Referring to shown in Figure 7, as follows based on the Hosted NAT registration process under the network model shown in Figure 6:
Step 701: user terminal sends the IP message of user's register requirement to SBGF.
After step 702:SBGF receives the IP message of this user's register requirement, obtain the source IP address/port in the IP heading in this IP message, create the NAT list item, utilize this NAT list item that this IP message is carried out address transition, and then send the IP message of user's register requirement to P-CSCF.
After step 703～706:P-CSCF received the IP message of this user's register requirement, mutual by with other network entity of core-network side obtained the IP message of register requirement response.And, the IP message that register requirement responds is sent to user terminal by SBGF.
Step 707:P-CSCF judges according to the IP message of the register requirement response of receiving whether this user terminal succeeds in registration, if succeed in registration, then preserve through SBGF and carry out IP address in the IP message of the user's register requirement after the address transition, and with this IP address as the Contact address, the signaling message that sends with transmission network side direction user terminal.
Step 708:P-CSCF sends control signaling to SBGF, indication SBGF user registration success, and the user's IP address/port information that carries in the message load with user's register requirement message sends to SBGF.
After step 709:SBGF receives this control signaling, be left the NAT list item of this user side dynamic creation, compare according to the user's IP address/port information that carries in the message load in the IP message of the source IP address/port in the IP message of user's register requirement of receiving and user's register requirement simultaneously, if both unanimities, then think and do not have NAT device between user side and the SBGF, if both are inconsistent, then think to have NAT device between user side and the SBGF.
Step 710～711:SBGF regularly sends NAT keep-alive message to user terminal, and NAT device is according to the NAT list item of this NAT keep-alive message renewal self message.
After this, if P-CSCF receives the signaling message of IMS/NGN network, the corresponding relation that utilizes step to preserve from c obtains the IP message address/port after the conversion of SBGF entity, and this signaling message is transmitted to the SBGF entity; The NAT list item that the SBGF entity is preserved according to self is changed the IP message address/port of this signaling message, and the IP message of reference address/port is sent; When NAT device is transmitted the IP message, utilize the NAT list item of self preserving to be transmitted to user terminal.Otherwise, need pass through NAT device, SBGF, P-CSCF to IMS/NGN network equally to IMS/NGN network signal message from user terminal.Wherein, NAT device and BGF carry out twice NAT conversion respectively.
Need to prove; in the NGN RACS framework of TISPAN definition; can pass through SPDF alternately between P-CSCF and the BGF; promptly mainly finish according to business demand and realize the control of bearing bed is carried out based on certain strategy; among the present invention program between P-CSCF and the SBGF both can be through SPDF alternately; also can be that two kinds of patterns do not influence the protection range of this patent, or this patent all is suitable for dual mode without SPDF.
Claims (9)
1, the method for a kind of based traversal network address conversion is applied to it is characterized in that this method may further comprise the steps in the system of the Border Gateway Function SBGF entity that comprises packet service network, access network and connect packet service network and access network:
A. user terminal sends the IP message of user's register requirement to the SBGF entity by access network, after the SBGF entity is received this IP message, obtain the source IP address/port in the IP heading in this IP message, and the IP heading of this IP message is carried out sending to after the NAT address transition Application Function in the packet service network;
B. after Application Function is received this IP message, IP message address/port after obtaining the user's IP address/port information that carries in the message load of this IP message and passing through the conversion of SBGF entity, and by obtaining the IP message that user's register requirement responds alternately with packet service network;
C. Application Function judges according to the IP message of this user's register requirement response whether registration is successful, if succeed in registration, then preserve the IP message address/port after the conversion of SBGF entity among the step b and the corresponding relation of this user terminal user ID, and the user's IP address/port information that carries in the message load in this IP message that obtains among the step b is sent to the SBGF entity;
User's IP address/the port information that carries in the message load that the d.SBGF entity sends source IP address/port of obtaining among the step a and Application Function compares; if it is inconsistent; then determine to have NAT device between user terminal and the SBGF entity; then regularly send NAT keep-alive message to this user terminal, described NAT device upgrades the NAT list item that self preserves when transmitting this NAT keep-alive message to this user terminal.
2, method according to claim 1 is characterized in that, the user domain name addresses of the user's IP address/port information that carries in the described message load for writing down in Contact address in this IP message or the Via header field.
3, method according to claim 1, it is characterized in that, further comprise in step b: SBGF creates network address translation NAT list item, and after in step c, succeeding in registration, notice SBGF entity user succeeds in registration, and after SBGF receives the notice that succeeds in registration in the steps d, preserves the NAT list item of creating for this user terminal among the step a, after steps d, further comprise:
E1, Application Function are received the signaling message of packet service network, and the corresponding relation that utilizes step to preserve from c obtains the IP message address/port after the conversion of SBGF entity, and this signaling message is transmitted to the SBGF entity;
E2, SBGF entity change the IP message address/port of this signaling message according to the NAT list item of self preserving, and the IP message of reference address/port is sent to user terminal;
When e3, NAT device transmit the IP message of step e2, utilize the NAT list item of self preserving to be transmitted to user terminal.
4, method according to claim 1 is characterized in that, described access network is the network of xDSL, Wlan, Cable, WiMax and wireless access way.
5, method according to claim 1 is characterized in that, described packet service network is IP Multimedia System IMS, or the NGN network.
6, method according to claim 5 is characterized in that, when NGN was the communication network of ITU-T definition, described Application Function was a service control proxy function SCPF entity.
7, method according to claim 5 is characterized in that, when packet network was IMS, described Application Function was an agent call interactive function P-CSCF entity.
8, method according to claim 1 is characterized in that, described access network or packet service network adopt IPv4 address format, IPv6 address format.
9, method according to claim 1 is characterized in that, described SBGF entity is physical entity independently, or is the logic entity among the BGF, or is the logic entity in the gateway device between Access Network and core net.
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| WO2012106935A1 (en) * | 2011-07-27 | 2012-08-16 | 华为技术有限公司 | Data communication network configuration method, gateway element and data communication system |
| CN105049543A (en) * | 2015-06-02 | 2015-11-11 | 上海斐讯数据通信技术有限公司 | P2P communication system and method crossing asymmetric NAT between intelligent routers |
| CN105049543B (en) * | 2015-06-02 | 2018-06-19 | 上海斐讯数据通信技术有限公司 | The system and method that asymmetric NAT carries out P2P communications is passed through between intelligent router |
| WO2017181682A1 (en) * | 2016-04-20 | 2017-10-26 | 上海斐讯数据通信技术有限公司 | Management system and method for gateway apparatus |
| CN113315808A (en) * | 2021-04-21 | 2021-08-27 | 深圳市捷视飞通科技股份有限公司 | Network address matching method and device, computer equipment and storage medium |
| CN113315808B (en) * | 2021-04-21 | 2022-09-30 | 深圳市捷视飞通科技股份有限公司 | Network address matching method and device, computer equipment and storage medium |
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| CN100493033C (en) | 2009-05-27 |
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