CN1968226A - Method for crossing network address conversion in point-to-point communication - Google Patents

Abstract

A method for traversing network address translation in point-to-point communication, comprising the following steps: in step 1, the initiator sends the collected initiator IP address/port pair and the corresponding priority to the receiving end; in step 2, the receiving end sends The collected receiving end IP address/port pair and the corresponding priority are sent to the initiator; in step 3, the receiving end checks the connection of each initiator IP address/port pair in the invitation message; the initiator checks the connection in the response message Each receiver IP address/port pair included in the connection check; in step 4, the receiver checks the connection with the initiator IP address/port pair assigned by the STUN server included in the invitation message; the initiator checks the STUN in the response message The receiving end IP address/port pair assigned by the server is connected to check. The invention can reduce the load and bandwidth requirement of the TURN server without analyzing the network topological structure.

Description

Method of traversing network address translation in point-to-point communication

technical field

The present invention relates to a method for traversing network address translation in point-to-point communication, and in particular to a method for traversing network address translation in point-to-point communication that can reduce the burden and bandwidth requirements of a server that traverses network address translation in a relay mode and does not need to analyze network topology method of conversion.

Background technique

With the popularity of the Internet based on TCP/IP, a large number of LANs of various sizes have been established and applied. In this LAN, each network device uses the IP address of the LAN to register in the LAN, and the connection forms a relatively independent and closed network. The network is generally called a private network (referred to as a private network). Correspondingly, the Internet is called the public network. Network devices on the private network use private IP addresses, and network devices on the public network use public IP addresses. In order to enable each terminal in the private network to access resources outside the private network, Network Address Translation (NETWORK ADDRESSTEANSLATION, NAT for short) is usually used between the private network and the public network to assign a legal The public network IP address and port number to realize access to the external network.

NAT methods include:

1. Cone NAT (CONE NAT). After the port binding of (private IP, private port) and (public IP, public port) is established, cone NAT performs port reuse for a series of sessions initiated by applications from the same private ip address and port, as long as As long as there is still a session, the bound port is reserved.

2. Full cone NAT (FULL CONE NAT). After establishing a public/private port binding for an outgoing session, a full cone NAT will then accept incoming traffic from the corresponding port on any end node on the public network. A full cone NAT is sometimes called a "promiscuous" NAT.

3. Restricted cone NAT (RESTRICTED CONE NAT). Restricted cone NAT only forwards to the internal host if the port of the external incoming data packet matches the mapped port used by the internal host to send external data. Restricted Cone NAT uses the principle of firewall to reject some external active connection requests by restricting input data packets to known external IP addresses.

4. Port restricted cone NAT (PORT RESTRICTED CONE NAT). For port-restricted cone-type NAT, if the external ip address and port match the port mapped on the NAT for those internal hosts to send out packets, the input packet will be forwarded to the corresponding internal host.

5. Symmetric NAT (SYMMETRIC NAT). Symmetric NAT does not maintain a consistent binding port when binding internal and external network addresses and ports, but assigns a new port to each new session.

From the application layer of the OSI reference model, it can be considered that the network is composed of workstations and servers, but from the perspective of the transport layer and network layer, there is no essential difference between workstations and servers, they are all connected to the network. Machine, can be replaced by network address or name. The communication between them is the so-called point-to-point communication, also called peer-to-peer communication.

The current Internet is equipped with NAT devices everywhere, which is mainly caused by the exhaustion of IPv4 address space. However, the asymmetric connectivity established by NAT devices brings unique problems to point-to-point communication applications and protocols such as teleconferencing and multiplayer online games. Current NAT devices are mainly designed for the typical client/server model, enabling anonymous clients to access servers with fixed IP addresses. Many NAT devices implement this asymmetric connection. Hosts on the private network can initiate an initial connection to hosts on the public network, but external hosts cannot initiate connections to internal hosts unless configured by the administrator of the NAT device. Usually, an intranet client does not have a unique IP address in the public network, but shares an IP address with a host in the same private network, and this sharing is maintained by a NAT device. This kind of anonymity and inaccessibility to intranet hosts is not a problem for client software such as web browsers, because the client software only needs an initial outbound connection. establish connection sessions directly with each other. The initiator and responder may be behind different NAT devices, and may have neither fixed IP addresses nor other forms of existence in the public network. For example, a common online game architecture involves hosts connecting to known servers for initialization and other administrative actions, with direct connections established between hosts for fast and efficient updates during games. Similarly, a file-sharing application also connects to known servers for resource lookups, but establishes direct connections for data transfers. Therefore, the impact of the NAT device on point-to-point communication is that the host behind the NAT device does not have a permanently available port on the public network to establish direct connections with other clients. Therefore, in point-to-point communication, it is necessary to overcome the influence caused by the NAT device and realize the traversal of the NAT device to establish a communication connection.

In the prior art, in order to achieve the above purpose, the following methods are usually adopted:

1. UDP HOLE PUNCHING method.

The method is to send a UDP data packet from a terminal in the private network where the NAT device is located to a terminal in the external network. When the data packet passes through the NAT device, the NAT device saves its mapping relationship so that the data sent from the terminal in the external network The packet can pass through the NAT device through the mapping relationship and reach the terminal in the private network. Since the processing flow of the NAT device is not standardized, this method cannot be applied to all types of NAT, and is only applicable to cone NAT, full cone NAT, restricted cone NAT, and port restricted cone NAT.

The disadvantage of this method is that it is necessary to analyze the topological structure of the network where the two ends of the point-to-point communication are located, and take different processing steps for different topological structures.

2. Interactive connection establishment (INTERACTIVE CONNECTIVITY ESTABLISHMENT, ICE for short) method.

What ICE defines is a standardized method that enables the two ends of a point-to-point communication to determine which type of NAT device exists between the two ends, and to determine a series of IP addresses that can be used to implement the connection. By using a variety of protocols and network connection mechanisms, such as UDP simple traversal of network address translation (SIMPLE TRAVERSAL OF USER DATAGRAM PROTOCOL ADDRESS TRANSLATION, referred to as STUN) mechanism, and relay mode traversal of network address translation (Traversal Using RelayNAT, referred to as TURN) mechanism, ICE can learn the topology of the network where the client is located and the various network addresses that these devices can communicate with. When a client (initiator) with ICE function wants to communicate with another client (receiver), it first It collects as much IP address information as possible from sources such as STUN, TURN, etc., configures those addresses locally, and selects the addresses that can provide IP traffic to the client. A key strength of ICE is its ability to unify the information provided by these sources of IP address information and create as many paths as possible to connect to its own destination. At this point, the initiating client connects to a STUN server through these addresses, and sends a start message to the desired receiving client. This message contains all the possible address combinations it has previously learned, and uses them to reach its destination. When the receiving end receives the start information, it will send a series of STUN requests to the originating end through these addresses. Usually, due to the topology of the network along the route and the NAT firewall, at least one of the STUN requests sent by the receiver will reach the initiator. When the initiator receives these STUN requests, it will reply one by one. If a part of the STUN request can penetrate and reach the receiving end, it means that the initiator and the receiving end can use this part of the address for communication. On this basis, the originating end and the receiving end will also use the highest-ranked part of the address in the activation information for further point-to-point communication.

Referring to the flow chart of the ICE method shown in Figure 1, it includes the following steps: first, the initiator collects all IP addresses/port pairs and corresponding priorities assigned to the initiator by the TURN/STUN server (a server that is provided with a TURN server and a STUN server at the same time) , among them, the local IP address/port pair has the highest priority, the IP address/port pair assigned by the STUN server has the second priority, and the IP address/port pair assigned by the TURN server has the lowest priority; then the initiator sends these IP addresses/ports The pair and the corresponding priority are sent to the receiving end in the form of an invitation message; after receiving the invitation message, the receiving end collects all IP address/port pairs and corresponding priority assigned to the receiving end by the TURN/STUN server, and then sends These IP address/port pairs and corresponding priorities are sent to the initiator in the form of a response message; then the receiving end checks whether it can connect to the initiator for each IP address/port pair in the invitation message , and select the IP address/port pair that can be connected to the initiator and has the highest priority as the IP address/port pair that establishes a point-to-point communication connection with the initiator; and the initiator also responds to the response message For each IP address/port pair in , check whether it can connect to the receiving end, and select the IP address/port pair that can be connected to the receiving end and has the highest priority as the point-to-point connection with the receiving end The IP address/port pair for the communication connection.

The disadvantage of this method is that if the initiator is behind a restricted cone NAT device or a port restricted cone NAT device, after the receiving end checks the IP address/port pair in the invitation message, it may select a TUREN server to assign the originating end The IP address/port pair used as the IP address/port pair for establishing a point-to-point communication connection with the initiator, thus increasing the burden and bandwidth requirements of the TURN server.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and provide a method for traversing network address translation in point-to-point communication, which can reduce the burden and bandwidth requirements of the TURN server for restricted cone NAT devices or port restricted cone NAT devices, And there is no need to analyze the network topology.

In order to achieve the above object, the present invention provides a method for traversing network address translation in point-to-point communication, comprising the following steps:

Step 1. The initiator collects all initiator IP address/port pairs including the IP address/port pair assigned to the initiator by the STUN/TURN server, and the priority corresponding to each initiator IP address/port pair, and then passes The invitation message sends the collected initiator IP address/port pair and the corresponding priority to the receiving end. Among them, the initiator's local IP address/port pair has the highest priority, and the IP address/port pair assigned by the STUN server has the second priority. In short, the IP address/port pair assigned by the TURN server has the lowest priority;

Step 2, the receiving end collects all receiving end IP addresses/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server, and the corresponding priority of each receiving end IP address/port pair, Then send the collected receiving end IP address/port pair and corresponding priority to the initiator through a response message, wherein the local IP address/port pair of the receiving end has the highest priority, and the IP address/port assigned by the STUN server The priority is second, and the IP address/port pair assigned by the TURN server has the lowest priority;

Step 3. The receiving end checks the connection of each initiator IP address/port pair included in the invitation message, and selects the IP address/port pair that can connect to the initiator and has the highest priority as the first IP address/port pair. An initiator IP address/port pair; the initiator performs a connection check on each receiver IP address/port pair included in the response message, and selects the receiver that can connect to the receiver and has the highest priority The IP address/port pair is used as the first receiving end IP address/port pair;

Step 4. The receiving end performs a connection check on the initiator IP address/port pair allocated by the STUN server included in the invitation message, and selects the initiator IP address/port with the highest priority that can be connected to the initiator Yes, as the second initiator IP address/port pair, and using the second initiator IP address/port pair as the initiator IP address/port pair for establishing a point-to-point communication connection with the initiator; the initiator pair The receiving end IP address/port pair assigned by the STUN server included in the response message is checked for connection, and the receiving end IP address/port pair that can be connected to the receiving end and has the highest priority is selected as the second receiving end IP address/port pair. address/port pair, and use the second receiving end IP address/port pair as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end. The operation of the receiving end and the operation of the initiating end in the above step 4 are carried out independently of each other, they can be carried out at the same time, or they can be carried out successively, and the sequence can be changed.

Further, the step 4 may specifically include the following steps: In step 40, the receiving end judges whether the IP address/port pair of the first initiator is the IP address/port pair assigned by the TURN server, and if so, execute the step 41, otherwise step 42 is performed; in step 41, the receiving end performs a connection check on the originating end IP address/port pair allocated by the STUN server included in the invitation message, and selects which can be connected to the originating end and has priority The initiator IP address/port pair with the highest level is used as the second initiator IP address/port pair, and the second initiator IP address/port pair is used as the initiator IP address for establishing a point-to-point communication connection with the initiator /port pair, and then perform step 43; in step 42, the receiving end uses the first initiator IP address/port pair as the initiator IP address/port pair to establish a point-to-point communication connection with the initiator; In step 43, the initiator judges whether the first receiving end IP address/port pair is the receiving end IP address/port pair allocated by the TURN server, if yes, execute step 44, otherwise execute step 45; in step 44, The initiator performs a connection check on the receiving end IP address/port pair assigned by the STUN server included in the response message, and selects the receiving end IP address/port pair that can be connected to the receiving end and has the highest priority as The second receiving end IP address/port pair, and using the second receiving end IP address/port pair as the receiving end IP address/port pair to establish a point-to-point communication connection with the receiving end, and then end; in step 45, The initiating end uses the first receiving end IP address/port pair as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end, and then ends. Step 400 may also be included before step 40, namely: the receiving end judges whether the STUN request message sent by the initiator is received, and if yes, execute step 40; otherwise, continue to execute step 400. The step 41 may specifically include the following steps: In step 410, the receiving end performs a connection check on the initiator IP address/port pair allocated by the STUN server included in the invitation message, and checks whether it includes the Initiator IP address/port pair of the initiator, if yes, execute step 411, otherwise execute step 42; in step 411, the receiver selects the initiator IP address/port pair distributed by the STUN server included in the invitation message Among them, the IP address/port pair with the highest priority that can be connected to the initiating end is used as the second initiating end IP address/port pair, and the second initiating end IP address/port pair is used as the The initiator establishes the IP address/port pair of the initiator for the point-to-point communication connection, and then executes step 43. Step 430 may also be included before step 44, that is: the initiating end determines whether the STUN request message sent by the receiving end is received, and if yes, execute step 44; otherwise, continue to execute step 430. The step 44 may specifically include the following steps: In step 440, the initiator performs a connection check on the receiving end IP address/port pair allocated by the STUN server included in the response message, and checks whether it includes the The receiving end IP address/port pair of the receiving end, if yes, execute step 441, otherwise execute step 45; in step 441, the initiator selects the receiving end IP address/port pair distributed by the STUN server included in the response message Among them, the IP address/port pair with the highest priority that can be connected to the receiving end is used as the second receiving end IP address/port pair, and the second receiving end IP address/port pair is used as the The receiving end establishes the receiving end IP address/port pair of the point-to-point communication connection, and then ends.

Further, the step 4 may specifically include the following steps: In step 40', the initiator judges whether the IP address/port pair of the first receiving end is the IP address/port pair of the receiving end allocated by the TURN server, yes Then execute step 41', otherwise execute step 42'; in step 41', the initiator IP address/port pair of the receiving end assigned by the STUN server included in the response message is checked for connection, and it is selected to connect to The receiving end and the receiving end IP address/port pair with the highest priority are used as the second receiving end IP address/port pair, and the second receiving end IP address/port pair is used as the point-to-point communication with the receiving end connected receiving end IP address/port pair, and then perform step 43'; in step 42', the initiator uses the first receiving end IP address/port pair as the receiving end for establishing a point-to-point communication connection with the receiving end terminal IP address/port pair; in step 43', the receiving end judges whether the first initiator IP address/port pair is the initiator IP address/port pair allocated by the TURN server, and if so, executes step 44', Otherwise, execute step 45'; in step 44', the receiving end performs a connection check on the initiator IP address/port pair allocated by the STUN server included in the invitation message, and selects which can be connected to the initiator and has priority The initiator IP address/port pair with the highest level is used as the second initiator IP address/port pair, and the second initiator IP address/port pair is used as the initiator IP address for establishing a point-to-point communication connection with the initiator /port pair, and then end; in step 45', the receiving end uses the first initiator IP address/port pair as the initiator IP address/port pair to establish a point-to-point communication connection with the initiator, and then ends . Step 400' may also be included before step 40', that is: the initiator judges whether the STUN request message sent by the receiver is received, and if yes, execute step 40'; otherwise, continue to execute step 400'. The step 41' may specifically include the following steps: In step 410', the initiator performs a connection check on the receiving end IP address/port pair allocated by the STUN server included in the response message, and checks whether it includes To the receiving end IP address/port pair of the receiving end, if yes, execute step 411', otherwise execute step 42'; in step 411', the initiator selects the receiving end assigned by the STUN server included in the response message Among the IP address/port pairs, the IP address/port pair with the highest priority that can be connected to the receiving end is used as the second receiving end IP address/port pair, and the second receiving end IP address/port For the IP address/port pair of the receiving end that establishes a point-to-point communication connection with the receiving end, then step 43' is performed. Before the step 44', it may further include: a step 430', namely: the receiving end judges whether the STUN request message sent by the initiating end is received, and if yes, execute the step 44'; otherwise, continue to execute the step 430'. The step 44' may specifically include the following steps: In step 440', the receiving end performs a connection check on the initiator IP address/port pair allocated by the STUN server included in the invitation message, and checks whether it includes an IP address/port pair that can be connected To the initiator IP address/port pair of the initiator, if yes, execute step 441', otherwise execute step 45'; in step 441', the receiver selects the IP address assigned by the STUN server included in the invitation message The IP address/port pair that can be connected to the initiator and has the highest priority in the /port pair is used as the second initiator IP address/port pair, and the second initiator IP address/port pair is used as the The IP address/port pair of the originator that establishes a point-to-point communication connection with the originator, and then ends.

To achieve the purpose of the invention, the present invention also provides another method for traversing network address translation in point-to-point communication, comprising the following steps:

Step A1, the initiator collects all initiator IP address/port pairs including the IP address/port pair assigned to the initiator by the STUN/TURN server, and the priority corresponding to each initiator IP address/port pair, and then passes The invitation message sends the collected initiator IP address/port pair and the corresponding priority to the receiving end. Among them, the initiator's local IP address/port pair has the highest priority, and the IP address/port pair assigned by the STUN server has the second priority. In short, the IP address/port pair assigned by the TURN server has the lowest priority;

Step A2, the receiving end performs a connection check on the initiator IP address/port pair assigned by the STUN server included in the invitation message, and selects the initiator IP address/port with the highest priority that can connect to the initiator Yes, as the third initiator IP address/port pair;

Step A3, the receiving end collects all receiving end IP address/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server, and the priority corresponding to each receiving end IP address/port pair, Then send the collected receiving end IP address/port pair and corresponding priority to the initiator through a response message, wherein the local IP address/port pair of the receiving end has the highest priority, and the IP address/port assigned by the STUN server The priority is second, and the IP address/port pair assigned by the TURN server has the lowest priority;

Step A4, the initiator performs a connection check on the receiving end IP address/port pair assigned by the STUN server included in the response message, and selects the receiving end IP address/port that can connect to the receiving end and has the highest priority Yes, as the third receiver IP address/port pair;

Step A5, the receiving end uses the third initiating end IP address/port pair as the IP address/port pair for establishing a point-to-point communication connection with the initiating end; the initiating end uses the third receiving end IP address/port pair The port pair serves as an IP address/port pair for establishing a point-to-point communication connection with the receiving end.

Further, the receiving end described in step A2 performing a connection check on the IP address/port pair of the initiator assigned by the STUN server included in the invitation message may specifically include: the receiving end sends the STUN included in the invitation message to The initiator IP address/port pair assigned by the server is used as the destination IP address/port pair, and a UDP message is sent to the destination IP address/port pair. The initiator described in step A4 performing a connection check on the receiving end IP address/port pair assigned by the STUN server included in the response message may specifically include: the initiator assigning the IP address/port pair included in the response message to the STUN server. The receiving end IP address/port pair is used as the destination IP address/port pair, and a UDP message is sent to the destination IP address/port pair.

Step A401 may also be included between step A4 and step A5, that is: the receiving end performs a connection check on each originating end IP address/port pair included in the invitation message, and selects the IP address/port pair that can be connected to the The initiator IP address/port pair with the highest priority as the fourth initiator IP address/port pair; the initiator connects to each receiver IP address/port pair included in the response message Checking, selecting the IP address/port pair of the receiving end that can be connected to the receiving end and has the highest priority as the fourth receiving end IP address/port pair. The step A2 may specifically include the following steps: In step A20, the receiving end checks whether the invitation message includes the initiator IP address/port pair assigned by the STUN server, if yes, execute step A21, otherwise execute step A3; In step A21, the receiving end selects the initiator IP address/port pair assigned by the STUN server included in the invitation message, which can be connected to the initiator and has the highest priority IP address/port pair, As the third initiator IP address/port pair. The step A4 may specifically include the following steps: In step A40, the initiator checks whether the response message includes the receiving end IP address/port pair allocated by the STUN server, if yes, execute step A41, otherwise execute step A401; In step A41, the initiator selects the IP address/port pair of the receiving end assigned by the STUN server included in the response message, which can be connected to the receiving end and has the highest priority IP address/port pair, As the third receiver IP address/port pair, then perform step A5.

Further, the step A5 may specifically include the following steps: In step A50, the receiving end judges whether the IP address/port pair of the third initiator has been selected, if yes, execute step A51, otherwise execute step A52; In step A51, the receiving end uses the third initiator IP address/port pair as the initiator IP address/port pair for establishing a point-to-point communication connection with the initiator, and then performs step A53; in step A52, the The receiving end uses the fourth initiator IP address/port pair as the initiator IP address/port pair for establishing a point-to-point communication connection with the initiator; in step A53, the initiator determines whether the fourth initiator has been selected Three receiver IP address/port pairs, if yes, execute step A54, otherwise execute step A55; in step A54, the initiator uses the third receiver IP address/port pair as a point-to-point communication with the receiver The receiving end IP address/port pair of connection, end then; In step A55, described initiating end uses described fourth receiving end IP address/port pair as the receiving end IP address/port that establishes point-to-point communication connection with described receiving end port pair, and end. The step A5 may also specifically include the following steps: In step A50', the initiator judges whether the IP address/port pair of the third receiving end has been selected, if yes, execute step A51', otherwise execute step A52'; In step A51', the initiator uses the third receiving end IP address/port pair as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end, and then performs step A53'; in step A52 ', the initiator uses the fourth receiving end IP address/port pair as the receiving end IP address/port pair to establish a point-to-point communication connection with the receiving end; in step A53', the receiving end determines whether The third initiator IP address/port pair has been selected, if yes, execute step A54', otherwise execute step A55'; in step A54', the receiving end uses the third initiator IP address/port pair as Establish the initiator IP address/port pair of the point-to-point communication connection with the initiator, and then end; in step A55', the receiver uses the fourth initiator IP address/port pair as the IP address/port pair established with the initiator The originating IP address/port pair of the point-to-point communication connection, and then ends.

In the above technical solution, by appropriately adding the IP address/port pair assigned by the STUN server to the connection check in the ICE method, that is, the step of sending a UDP message to the IP address/port pair assigned by the STUN server, thus organically combining The UDP hole-punching method and the ICE method make it possible for the ICE method to connect to the other party through the TURN server. The communication can reach the other party without passing through the TURN server, thereby reducing the burden on the TURN server and bandwidth requirements, and does not need to analyze the network topology.

It can be seen from the above technical solution that the present invention organically combines the UDP hole punching method and the ICE method for traversing NAT in point-to-point communication, which can achieve the beneficial effect of reducing the burden on the TURN server and bandwidth requirements, and does not need to analyze the network topology.

Description of drawings

Fig. 1 is the flowchart of the ICE method of point-to-point communication traversing NAT in the prior art;

Fig. 2 is a schematic diagram of networking in Embodiment 1 of the present invention;

Fig. 3 is the flow chart of specific embodiment 1 of the present invention;

Fig. 4 is the flowchart of the second embodiment of the present invention;

Fig. 5 is the flowchart of the third embodiment of the present invention;

FIG. 6 is a flow chart of Embodiment 4 of the present invention;

Fig. 7 is the flowchart of the fifth embodiment of the present invention;

FIG. 8 is a flow chart of Embodiment 6 of the present invention.

Detailed ways

The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Referring to the networking schematic diagram of the first embodiment of the present invention shown in Figure 2, the TURN/STUN server is a server with a TURN server end and a STUN server end at the same time, and the server is located in the public network; network, and connect to the public network through a NAT device; the initiator has a STUN client and a TURN client, and the receiver has a STUN client and a TURN client; both the initiator and receiver support the ICE method. Referring to the flow chart of the first embodiment of the present invention shown in FIG. 3, a method for traversing network address translation in point-to-point communication includes the following steps: In step 1, the initiator collects information including STUN/TURN servers assigned to the initiator. All initiator IP address/port pairs including IP address/port pairs, and the priority corresponding to each initiator IP address/port pair, among them, the initiator’s local IP address/port pair has the highest priority, and the STUN server assigns The priority of the IP address/port pair assigned by the TURN server is next, and the IP address/port pair assigned by the TURN server has the lowest priority, and then send the collected initiator IP address/port pair and corresponding priority to the receiving end through an invitation message; In step 2, the receiving end collects all receiving end IP address/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server, and the priority corresponding to each receiving end IP address/port pair , where the local IP address/port pair at the receiving end has the highest priority, the IP address/port pair assigned by the STUN server has the second priority, and the IP address/port pair assigned by the TURN server has the lowest priority, and then the collected The receiving end IP address/port pair and the corresponding priority are sent to the initiator; in step 3, the receiving end performs a connection check on each initiator IP address/port pair included in the invitation message, Selecting the IP address/port pair that can be connected to the initiator and has the highest priority as the first initiator IP address/port pair; The port pair is connected to check, and the receiving end IP address/port pair with the highest priority that can be connected to the receiving end is selected as the first receiving end IP address/port pair; in step 4, the receiving end is connected to the receiving end The initiator IP address/port pair assigned by the STUN server included in the invitation message is checked for connection, and the initiator IP address/port pair with the highest priority that can be connected to the initiator is selected as the second initiator IP address /port pair, and use the second initiator IP address/port pair as the initiator IP address/port pair to establish a point-to-point communication connection with the initiator; the initiator responds to the STUN server included in the response message The assigned receiving end IP address/port pair is connected to check, and the receiving end IP address/port pair that can be connected to the receiving end and has the highest priority is selected as the second receiving end IP address/port pair, and the The second receiving end IP address/port pair serves as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end. In this embodiment, by adding the operation process described in step 4 in the ICE method, the IP address/port pair allocated by the STUN server can be selected as the IP address/port pair for establishing a point-to-point communication connection, effectively reducing the load on the TURN server .

Referring to the flow chart of the second embodiment of the present invention shown in FIG. 4, a method for traversing network address translation in point-to-point communication includes the following steps: In step 1, the initiator collects the STUN/TURN server distribution to the initiator. All initiator IP address/port pairs including IP address/port pairs, and the priority corresponding to each initiator IP address/port pair, among them, the initiator’s local IP address/port pair has the highest priority, and the STUN server assigns The priority of the IP address/port pair assigned by the TURN server is next, and the IP address/port pair assigned by the TURN server has the lowest priority, and then send the collected initiator IP address/port pair and corresponding priority to the receiving end through an invitation message; In step 2, the receiving end collects all receiving end IP address/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server, and the priority corresponding to each receiving end IP address/port pair , where the local IP address/port pair at the receiving end has the highest priority, the IP address/port pair assigned by the STUN server has the second priority, and the IP address/port pair assigned by the TURN server has the lowest priority, and then the collected The receiving end IP address/port pair and the corresponding priority are sent to the initiator; in step 3, the receiving end performs a connection check on each initiator IP address/port pair included in the invitation message, Selecting the IP address/port pair that can be connected to the initiator and has the highest priority as the first initiator IP address/port pair; The port pairs are connected and checked, and the receiving end IP address/port pair with the highest priority that can be connected to the receiving end is selected as the first receiving end IP address/port pair; in step 40, the receiving end judges the receiving end IP address/port pair Whether the first initiator IP address/port pair is the IP address/port pair distributed by the TURN server, if so, step 41 is executed, otherwise step 42 is executed; in step 41, the receiving end includes in the invitation message The initiator IP address/port pair allocated by the STUN server is checked for connection, and the initiator IP address/port pair with the highest priority that can be connected to the initiator is selected as the second initiator IP address/port pair, and The second initiator IP address/port pair is used as the initiator IP address/port pair to establish a point-to-point communication connection with the initiator, and then step 43 is performed; in step 42, the receiving end uses the first initiator end IP address/port pair as the initiator IP address/port pair that establishes a point-to-point communication connection with the initiator; in step 43, the initiator judges whether the first receiver IP address/port pair is a TURN server The receiving end IP address/port that distributes is paired, then executes step 44, otherwise executes step 45; In step 44, the receiving end IP address/port that the STUN server that comprises in the described response message distributes by described initiator carries out Connection check, selecting the receiving end IP address/port pair that can be connected to the receiving end and having the highest priority as the second receiving end IP address/port pair, and using the second receiving end IP address/port pair as Set up the receiving end IP address/port pair of point-to-point communication connection with the receiving end, and then end; The receiving end IP address/port pair of the communication connection, and then end. In this embodiment, by first judging whether the IP address/port pair selected in step 3 is the IP address/port pair distributed by the TURN server, if so, the IP address/port pair distributed by the STUN server is preferred, otherwise no further optimization is required , thus not only effectively reducing the load of the TURN server, but also avoiding redundant operations.

In the above-mentioned specific embodiment two, step 400 may also be included before the step 40, that is: the receiving end judges whether the STUN request message sent by the initiator is received, and if yes, execute step 40, otherwise continue to execute step 400. The step 41 may specifically include the following steps: In step 410, the receiving end performs a connection check on the initiator IP address/port pair allocated by the STUN server included in the invitation message, and checks whether it includes the Initiator IP address/port pair of the initiator, if yes, execute step 411, otherwise execute step 42; in step 411, the receiver selects the initiator IP address/port pair distributed by the STUN server included in the invitation message Among them, the IP address/port pair with the highest priority that can be connected to the initiating end is used as the second initiating end IP address/port pair, and the second initiating end IP address/port pair is used as the The initiator establishes the IP address/port pair of the initiator for the point-to-point communication connection, and then executes step 43. Step 430 may also be included before step 44, that is: the initiating end determines whether the STUN request message sent by the receiving end is received, and if yes, execute step 44; otherwise, continue to execute step 430. The step 44 may specifically include the following steps: In step 440, the initiator performs a connection check on the receiving end IP address/port pair allocated by the STUN server included in the response message, and checks whether it includes the The receiving end IP address/port pair of the receiving end, if yes, execute step 441, otherwise execute step 45; in step 441, the initiator selects the receiving end IP address/port pair distributed by the STUN server included in the response message Among them, the IP address/port pair with the highest priority that can be connected to the receiving end is used as the second receiving end IP address/port pair, and the second receiving end IP address/port pair is used as the The receiving end establishes the receiving end IP address/port pair of the point-to-point communication connection, and then ends.

Referring to the flow chart of the third embodiment of the present invention shown in FIG. 5, a method for traversing network address translation in point-to-point communication includes the following steps: In step 1, the initiator collects the STUN/TURN server distribution to the initiator. All initiator IP address/port pairs including IP address/port pairs, and the priority corresponding to each initiator IP address/port pair, among them, the initiator’s local IP address/port pair has the highest priority, and the STUN server assigns The priority of the IP address/port pair assigned by the TURN server is next, and the IP address/port pair assigned by the TURN server has the lowest priority, and then send the collected initiator IP address/port pair and corresponding priority to the receiving end through an invitation message; In step 2, the receiving end collects all receiving end IP address/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server, and the priority corresponding to each receiving end IP address/port pair , where the local IP address/port pair at the receiving end has the highest priority, the IP address/port pair assigned by the STUN server has the second priority, and the IP address/port pair assigned by the TURN server has the lowest priority, and then the collected The receiving end IP address/port pair and the corresponding priority are sent to the initiator; in step 3, the receiving end performs a connection check on each initiator IP address/port pair included in the invitation message, Selecting the IP address/port pair that can be connected to the initiator and has the highest priority as the first initiator IP address/port pair; Port pairs are connected and checked, and the receiving end IP address/port pair with the highest priority that can be connected to the receiving end is selected as the first receiving end IP address/port pair; in step 40', the initiator judges Whether described first receiving end IP address/port pair is the receiving end IP address/port pair that TURN server distributes, is then execution step 41 ', otherwise execution step 42'; In step 41 ', described initiation end pair The receiving end IP address/port pair assigned by the STUN server included in the response message is checked for connection, and the receiving end IP address/port pair that can be connected to the receiving end and has the highest priority is selected as the second receiving end IP address/port pair. address/port pair, and use the second receiving end IP address/port pair as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end, and then perform step 43'; in step 42', the The initiator uses the first receiving end IP address/port pair as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end; in step 43', the receiving end judges that the first initiator Whether the terminal IP address/port pair is the initiator IP address/port pair allocated by the TURN server, if so, step 44' is performed, otherwise step 45' is performed; in step 44', the receiving terminal includes in the invitation message The initiator IP address/port pair allocated by the STUN server in the STUN server is connected to the initiator IP address/port pair, and the initiator IP address/port pair with the highest priority that can be connected to the initiator is selected as the second initiator IP address/port pair, and Use the second initiator IP address/port pair as the initiator IP address/port pair to establish a point-to-point communication connection with the initiator, and then end; in step 45', the receiver uses the first initiator The IP address/port pair of the terminal is used as the IP address/port pair of the initiator to establish a point-to-point communication connection with the initiator, and then ends.

In the third specific embodiment above, step 400' may also be included before step 40', that is: the initiator judges whether the STUN request message sent by the receiver is received, and if yes, step 40' is executed; otherwise Proceed to step 400'. The step 41' may specifically include the following steps: In step 410', the initiator performs a connection check on the receiving end IP address/port pair allocated by the STUN server included in the response message, and checks whether it includes To the receiving end IP address/port pair of the receiving end, if yes, execute step 411', otherwise execute step 42'; in step 411', the initiator selects the receiving end assigned by the STUN server included in the response message Among the IP address/port pairs, the IP address/port pair with the highest priority that can be connected to the receiving end is used as the second receiving end IP address/port pair, and the second receiving end IP address/port For the IP address/port pair of the receiving end that establishes a point-to-point communication connection with the receiving end, then step 43' is performed. Before the step 44', it may further include: a step 430', namely: the receiving end judges whether the STUN request message sent by the initiating end is received, and if yes, execute the step 44'; otherwise, continue to execute the step 430'. The step 44' may specifically include the following steps: In step 440', the receiving end performs a connection check on the initiator IP address/port pair allocated by the STUN server included in the invitation message, and checks whether it includes an IP address/port pair that can be connected To the initiator IP address/port pair of the initiator, if yes, execute step 441', otherwise execute step 45'; in step 441', the receiver selects the IP address assigned by the STUN server included in the invitation message The IP address/port pair that can be connected to the initiator and has the highest priority in the /port pair is used as the second initiator IP address/port pair, and the second initiator IP address/port pair is used as the The IP address/port pair of the originator that establishes a point-to-point communication connection with the originator, and then ends.

Referring to the flow chart of Embodiment 4 of the present invention shown in FIG. 6 , a method for traversing network address translation in point-to-point communication includes the following steps: In step A1, the originating end collects information including STUN/TURN servers assigned to the originating end All initiator IP address/port pairs including IP address/port pairs, and the priority corresponding to each initiator IP address/port pair, among them, the initiator’s local IP address/port pair has the highest priority, and the STUN server assigns The priority of the IP address/port pair assigned by the TURN server is next, and the IP address/port pair assigned by the TURN server has the lowest priority, and then send the collected initiator IP address/port pair and corresponding priority to the receiving end through an invitation message; In step A2, the receiving end performs a connection check on the initiator IP address/port pair assigned by the STUN server included in the invitation message, and selects the initiator IP address/port pair that can connect to the initiator and has the highest priority. Port pair, as the third initiator IP address/port pair; in step A3, the receiving end collects all receiving end IP address/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server , and the priority corresponding to each IP address/port pair at the receiving end, where the local IP address/port pair at the receiving end has the highest priority, followed by the IP address/port pair assigned by the STUN server, and the IP address/port pair assigned by the TURN server The address/port pair has the lowest priority, and then the collected receiving end IP address/port pair and the corresponding priority are sent to the initiator through a response message; in step A4, the initiator responds to the response message The receiving end IP address/port pair allocated by the included STUN server is checked for connection, and the receiving end IP address/port pair that can be connected to the receiving end and has the highest priority is selected as the third receiving end IP address/port pair; In step A5, the receiving end uses the IP address/port pair of the third initiating end as the IP address/port pair for establishing a point-to-point communication connection with the initiating end; The address/port pair serves as an IP address/port pair for establishing a point-to-point communication connection with the receiving end. In this embodiment, the operation process described in step A2 and step A4 is added to the ICE method, so that the IP address/port pair allocated by the STUN server is preferred first, which further simplifies the operation process.

Referring to the flow chart of the fifth embodiment of the present invention shown in FIG. 7, a method for traversing network address translation in point-to-point communication includes the following steps: In step A1, the initiator collects the STUN/TURN server distribution to the initiator. All initiator IP address/port pairs including IP address/port pairs, and the priority corresponding to each initiator IP address/port pair, among them, the initiator’s local IP address/port pair has the highest priority, and the STUN server assigns The priority of the IP address/port pair assigned by the TURN server is next, and the IP address/port pair assigned by the TURN server has the lowest priority, and then send the collected initiator IP address/port pair and corresponding priority to the receiving end through an invitation message; In step A20, the receiving end checks whether the invitation message includes the initiator IP address/port pair assigned by the STUN server, if yes, execute step A21, otherwise execute step A3; in step A21, the receiving end selects the The initiator IP address/port pair assigned by the STUN server included in the invitation message, which can be connected to the initiator and has the highest priority IP address/port pair, is used as the third initiator IP address/port pair; In step A3, the receiving end collects all receiving end IP address/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server, and the corresponding priority of each receiving end IP address/port pair. Among them, the local IP address/port pair of the receiving end has the highest priority, the IP address/port pair assigned by the STUN server has the second priority, and the IP address/port pair assigned by the TURN server has the lowest priority, and then the collected The receiving end IP address/port pair and the corresponding priority are sent to the initiator; in step A40, the initiator checks whether the response message includes the receiving end IP address/port pair assigned by the STUN server, If yes, execute step A41, otherwise execute step A401; in step A41, the initiator selects the receiving end IP address/port pair assigned by the STUN server included in the response message, which can be connected to the receiving end, And the IP address/port pair with the highest priority is used as the third receiving end IP address/port pair, and then step A50 is performed; /port pair for connection check, select the initiator IP address/port pair that can be connected to the initiator and has the highest priority as the fourth initiator IP address/port pair; Each receiving end IP address/port pair included is checked for connection, and the receiving end IP address/port pair that can be connected to the receiving end and has the highest priority is selected as the fourth receiving end IP address/port pair; in step In A50, the receiving end judges whether the IP address/port pair of the third initiator has been selected, if yes, execute step A51, otherwise execute step A52; in step A51, the receiving end selects the third initiator The IP address/port pair is used as the initiator IP address/port pair to establish a point-to-point communication connection with the initiator, and then step A53 is performed; in step A52, the receiving end uses the fourth initiator IP address/port pair As the initiator IP address/port pair for establishing a point-to-point communication connection with the initiator; in step A53, the initiator judges whether the third receiver IP address/port pair has been selected, and if so, step A54 is performed, Otherwise, step A55 is performed; in step A54, the initiator uses the third receiving end IP address/port pair as the receiving end IP address/port pair to establish a point-to-point communication connection with the receiving end, and then ends; in step In A55, the initiating end uses the fourth receiving end IP address/port pair as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end, and then ends. In this embodiment, when at first the IP address/port pair that STUN server distributes is preferred, further judge whether to have the IP address/port pair that STUN server distributes first, and select the IP address that establishes point-to-point communication connection according to the result of connection inspection /port pair, which not only effectively reduces the load on the TURN server, but also simplifies the operation process and avoids redundant operations.

Referring to the flow chart of Embodiment 6 of the present invention shown in FIG. 8 , a method for traversing network address translation in point-to-point communication includes the following steps: In step A1, the initiator collects the IP addresses assigned to the initiator by the STUN/TURN server. All initiator IP address/port pairs including IP address/port pairs, and the priority corresponding to each initiator IP address/port pair, among them, the initiator’s local IP address/port pair has the highest priority, and the STUN server assigns The priority of the IP address/port pair assigned by the TURN server is next, and the IP address/port pair assigned by the TURN server has the lowest priority, and then send the collected initiator IP address/port pair and corresponding priority to the receiving end through an invitation message; In step A20, the receiving end checks whether the IP address/port pair of the originating end assigned by the STUN server is included in the communication appointment message, if yes, step A21 is executed, otherwise step A3 is executed; in step A21, the receiving end selects The initiator IP address/port pair assigned by the STUN server included in the invitation message, which can be connected to the initiator and has the highest priority IP address/port pair, is used as the third initiator IP address/port pair ; In step A3, the receiving end collects all receiving end IP addresses/port pairs including the IP address/port pair assigned to the receiving end by the STUN/TURN server, and each receiving end IP address/port pair corresponds to Priority, among them, the local IP address/port pair of the receiving end has the highest priority, the IP address/port pair assigned by the STUN server has the second priority, and the IP address/port pair assigned by the TURN server has the lowest priority, and then the response message will send The collected receiver IP address/port pair and the corresponding priority are sent to the initiator; in step A40, the initiator checks whether the response message includes the receiver IP address/port pair assigned by the STUN server , if yes, execute step A41, otherwise execute step A401; in step A41, the initiator selects the receiving end IP address/port pair assigned by the STUN server included in the response message, which can be connected to the receiving end , and the IP address/port pair with the highest priority, as the third receiving end IP address/port pair, and then perform step A50'; in step 401, the receiving end will The IP address/port pair is checked for connection, and the initiator IP address/port pair with the highest priority that can be connected to the initiator is selected as the fourth initiator IP address/port pair; the initiator responds to the Each receiving end IP address/port pair included in the message performs a connection check, and selects the receiving end IP address/port pair that can be connected to the receiving end and has the highest priority as the fourth receiving end IP address/port pair; In step A50', the initiator judges whether the IP address/port pair of the third receiving end has been selected, if yes, execute step A51', otherwise execute step A52'; in step A51', the initiator will The third receiving end IP address/port pair is used as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end, and then step A53' is performed; in step A52', the initiator transfers the first Four receiving end IP address/port pairs as the receiving end IP address/port pair for establishing a point-to-point communication connection with the receiving end; in step A53', the receiving end judges whether the third initiator IP address/port pair has been selected Port pair, if yes, execute step A54', otherwise execute step A55'; in step A54', the receiving end uses the third initiator IP address/port pair as the initiator to establish a point-to-point communication connection with the initiator terminal IP address/port pair, and then end; in step A55', the receiving end uses the fourth initiator IP address/port pair as the initiator IP address/port pair to establish a point-to-point communication connection with the initiator , and end.

In the above specific embodiments 4, 5, and 6, the receiving end described in step A2 performing a connection check on the IP address/port pair of the initiator assigned by the STUN server included in the invitation message may specifically include: the receiving end will The initiator IP address/port pair assigned by the STUN server included in the invitation message is used as the destination IP address/port pair, and a UDP message is sent to the destination IP address/port pair. The initiator described in step A4 performing a connection check on the receiving end IP address/port pair assigned by the STUN server included in the response message may specifically include: the initiator assigning the IP address/port pair included in the response message to the STUN server. The receiving end IP address/port pair is used as the destination IP address/port pair, and a UDP message is sent to the destination IP address/port pair.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be The scheme shall be modified or equivalently replaced without departing from the spirit and scope of the technical scheme of the present invention.

Claims (19)

1, the method for based traversal network address conversion in a kind of point-to-point communication is characterized in that, may further comprise the steps:

Step 1, originating end collect comprise IP address that the STUN/TURN server-assignment gives this originating end to all originating end IP address right, and each originating end IP address sends to receiving terminal with the originating end IP address of collecting to reaching corresponding priorities by inviting message then to corresponding priorities;

Step 2, described receiving terminal collect comprise IP address that the STUN/TURN server-assignment gives this receiving terminal to all receiving terminal IP address right, and each receiving terminal IP address is to corresponding priorities, then the receiving terminal IP address of will collecting by receiveing the response to and corresponding priorities send to described originating end;

Step 3, described receiving terminal to described each originating end IP address of comprising in the message of inviting to connecting inspection, choose that wherein can be connected to the highest IP address of described originating end and priority right, right as the first originating end IP address; Described originating end to connecting inspection, chooses that wherein can be connected to the highest receiving terminal IP address of described receiving terminal and priority right to each receiving terminal IP address of comprising in described the receiveing the response, and is right as the first receiving terminal IP address;

Step 4, described receiving terminal to the described originating end IP address of the STUN server-assignment that comprises in the message of inviting to connecting inspection, choose that wherein can be connected to the highest originating end IP address of described originating end and priority right, right as the second originating end IP address, and with the described second originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end; Described originating end to the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response to connecting inspection, choose that wherein can be connected to the highest receiving terminal IP address of described receiving terminal and priority right, right as the second receiving terminal IP address, and with the described second receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal.

2, method according to claim 1 is characterized in that, described step 4 specifically comprises:

Step 40, described receiving terminal are judged the described first originating end IP address to whether being that the IP address of TURN server-assignment is right, are execution in step 41 then, otherwise execution in step 42;

Step 41, described receiving terminal to the described originating end IP address of the STUN server-assignment that comprises in the message of inviting to connecting inspection, choose that wherein can be connected to the highest originating end IP address of described originating end and priority right, right as the second originating end IP address, and with the described second originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, execution in step 43 then;

Step 42, described receiving terminal with the described first originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end;

Step 43, described originating end are judged the described first receiving terminal IP address to whether being that the receiving terminal IP address of TURN server-assignment is right, are execution in step 44 then, otherwise execution in step 45;

Step 44, described originating end to the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response to connecting inspection, choose that wherein can be connected to the highest receiving terminal IP address of described receiving terminal and priority right, right as the second receiving terminal IP address, and with the described second receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, finish then;

Step 45, described originating end to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, finish the described first receiving terminal IP address then.

3, method according to claim 2 is characterized in that, and is further comprising the steps of before described step 40:

Step 400, described receiving terminal judge whether to receive the STUN request message that described originating end sends, and are execution in step 40 then, otherwise continue execution in step 400.

4, according to claim 2 or 3 described methods, it is characterized in that described step 41 specifically may further comprise the steps:

Step 410, described receiving terminal to the described originating end IP address of the STUN server-assignment that comprises in the message of inviting to connecting inspection, check and whether comprise that wherein the originating end IP address that can be connected to described originating end is right, be execution in step 411 then, otherwise execution in step 42;

Step 411, described receiving terminal choose described originating end IP address centering of inviting the STUN server-assignment that comprises in the message, that can be connected to described originating end and IP address that priority is the highest is right, right as the second originating end IP address, and with the described second originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, execution in step 43 then.

5, method according to claim 4 is characterized in that, and is further comprising the steps of before described step 44:

Step 430, described originating end judge whether to receive the STUN request message that described receiving terminal sends, and are execution in step 44 then, otherwise continue execution in step 430.

6, method according to claim 5 is characterized in that, described step 44 specifically may further comprise the steps:

Step 440, described originating end to the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response to connecting inspection, check and whether comprise that wherein the receiving terminal IP address that can be connected to described receiving terminal is right, be execution in step 441 then, otherwise execution in step 45;

Step 441, described originating end choose the STUN server-assignment that comprises in described the receiveing the response receiving terminal IP address centering, that can be connected to described receiving terminal and IP address that priority is the highest is right, right as the second receiving terminal IP address, and with the described second receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, finish then.

7, method according to claim 1 is characterized in that, described step 4 specifically may further comprise the steps:

Step 40 ', described originating end judges the described first receiving terminal IP address to whether being that the receiving terminal IP address of TURN server-assignment is right, be then execution in step 41 ', otherwise execution in step 42 ';

Step 41 ', described originating end to the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response to connecting inspection, choose that wherein can be connected to the highest receiving terminal IP address of described receiving terminal and priority right, right as the second receiving terminal IP address, and with the described second receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, then execution in step 43 ';

Step 42 ', described originating end with the described first receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal;

Step 43 ', described receiving terminal judges the described first originating end IP address to whether being that the originating end IP address of TURN server-assignment is right, be then execution in step 44 ', otherwise execution in step 45 ';

Step 44 ', described receiving terminal to the described originating end IP address of the STUN server-assignment that comprises in the message of inviting to connecting inspection, choose that wherein can be connected to the highest originating end IP address of described originating end and priority right, right as the second originating end IP address, and with the described second originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, finish then;

Step 45 ', described receiving terminal to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, finishes the described first originating end IP address then.

8, method according to claim 7 is characterized in that, described step 40 ' before further comprising the steps of:

Step 400 ', described originating end judges whether to receive the STUN request message that described receiving terminal sends, be then execution in step 40 ', otherwise continue execution in step 400 '.

9, according to claim 7 or 8 described methods, it is characterized in that described step 41 ' specifically may further comprise the steps:

Step 410 ', described originating end to the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response to connecting inspection, check and whether comprise that wherein the receiving terminal IP address that can be connected to described receiving terminal is right, be then execution in step 411 ', otherwise execution in step 42 ';

Step 411 ', described originating end choose the STUN server-assignment that comprises in described the receiveing the response receiving terminal IP address centering, that can be connected to described receiving terminal and IP address that priority is the highest is right, right as the second receiving terminal IP address, and with the described second receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, then execution in step 43 '.

10, method according to claim 9 is characterized in that, described step 44 ' before further comprising the steps of:

Step 430 ', described receiving terminal judges whether to receive the STUN request message that described originating end sends, be then execution in step 44 ', otherwise continue execution in step 430 '.

11, method according to claim 10 is characterized in that, described step 44 ' specifically may further comprise the steps:

Step 440 ', described receiving terminal to the described originating end IP address of the STUN server-assignment that comprises in the message of inviting to connecting inspection, check and whether comprise that wherein the originating end IP address that can be connected to described originating end is right, be then execution in step 441 ', otherwise execution in step 45 ';

Step 441 ', described receiving terminal chooses described IP address centering of inviting the STUN server-assignment that comprises in the message, that can be connected to described originating end and IP address that priority is the highest is right, right as the second originating end IP address, and with the described second originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, finish then.

12, the method for based traversal network address conversion in a kind of point-to-point communication is characterized in that, may further comprise the steps:

Steps A 1, originating end collect comprise IP address that the STUN/TURN server-assignment gives this originating end to all originating end IP address right, and each originating end IP address sends to receiving terminal with the originating end IP address of collecting to reaching corresponding priorities by inviting message then to corresponding priorities;

Steps A 2, described receiving terminal to the described originating end IP address of the STUN server-assignment that comprises in the message of inviting to connecting inspection, choose that wherein can be connected to the highest originating end IP address of described originating end and priority right, right as the 3rd originating end IP address;

Steps A 3, described receiving terminal collect comprise IP address that the STUN/TURN server-assignment gives this receiving terminal to all receiving terminal IP address right, and each receiving terminal IP address is to corresponding priorities, then the receiving terminal IP address of will collecting by receiveing the response to and corresponding priorities send to described originating end;

Steps A 4, described originating end to the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response to connecting inspection, choose that wherein can be connected to the highest receiving terminal IP address of described receiving terminal and priority right, right as the 3rd receiving terminal IP address;

Steps A 5, described receiving terminal with described the 3rd originating end IP address to as to set up the IP address that point-to-point communication is connected right with described originating end; Described originating end with described the 3rd receiving terminal IP address to as to set up the IP address that point-to-point communication is connected right with described receiving terminal.

13, method according to claim 12, it is characterized in that, receiving terminal described in the steps A 2 specifically comprises connecting inspection described originating end IP address of inviting the STUN server-assignment that comprises in the message: described receiving terminal with described originating end IP address of inviting the STUN server-assignment that comprises in the message to right as purpose IP address, and to this purpose IP address to sending UDP message.

14, method according to claim 13, it is characterized in that, originating end described in the steps A 4 specifically comprises connecting inspection the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response: described originating end with the receiving terminal IP address of the STUN server-assignment that comprises in described the receiveing the response to right as purpose IP address, and to this purpose IP address to sending UDP message.

15, method according to claim 12 is characterized in that, and is further comprising the steps of between described steps A 4 and the A5:

Steps A 401, described receiving terminal to described each originating end IP address of comprising in the message of inviting to connecting inspection, choose that wherein can be connected to the highest originating end IP address of described originating end and priority right, right as the 4th originating end IP address; Described originating end to connecting inspection, chooses that wherein can be connected to the highest receiving terminal IP address of described receiving terminal and priority right to each receiving terminal IP address of comprising in described the receiveing the response, and is right as the 4th receiving terminal IP address.

16, method according to claim 15 is characterized in that, described steps A 2 specifically may further comprise the steps:

Steps A 20, described receiving terminal check that the described originating end IP address that whether comprises the STUN server-assignment in the message of inviting is right, are execution in step A21 then, otherwise execution in step A3;

Steps A 21, described receiving terminal choose described originating end IP address centering of inviting the STUN server-assignment that comprises in the message, that can be connected to described originating end and IP address that priority is the highest is right, and be right as the 3rd originating end IP address.

17, method according to claim 16 is characterized in that, described steps A 4 specifically may further comprise the steps:

Steps A 40, described originating end check in described the receiveing the response whether comprise that the receiving terminal IP address of STUN server-assignment is right, are execution in step A41 then, otherwise execution in step A401;

Steps A 41, described originating end choose the STUN server-assignment that comprises in described the receiveing the response receiving terminal IP address centering, that can be connected to described receiving terminal and IP address that priority is the highest is right, right as the 3rd receiving terminal IP address, execution in step A5 then.

According to claim 16 or 17 described methods, it is characterized in that 18, described steps A 5 specifically may further comprise the steps:

It is right that steps A 50, described receiving terminal judge whether to choose described the 3rd originating end IP address, is execution in step A51 then, otherwise execution in step A52;

Steps A 51, described receiving terminal with described the 3rd originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, execution in step A53 then;

Steps A 52, described receiving terminal with described the 4th originating end IP address to as to set up the originating end IP address that point-to-point communication is connected right with described originating end;

It is right that steps A 53, described originating end judge whether to choose described the 3rd receiving terminal IP address, is execution in step A54 then, otherwise execution in step A55;

Steps A 54, described originating end to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, finish described the 3rd receiving terminal IP address then;

Steps A 55, described originating end to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, finish described the 4th receiving terminal IP address then.

According to claim 16 or 17 described methods, it is characterized in that 19, described steps A 5 specifically may further comprise the steps:

Steps A 50 ', that described originating end judges whether to choose described the 3rd receiving terminal IP address is right, is execution in step A51 ' then, otherwise execution in step A52 ';

Steps A 51 ', described originating end with described the 3rd receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal, execution in step A53 ' then;

Steps A 52 ', described originating end with described the 4th receiving terminal IP address to as to set up the receiving terminal IP address that point-to-point communication is connected right with described receiving terminal;

Steps A 53 ', that described receiving terminal judges whether to choose described the 3rd originating end IP address is right, is execution in step A54 ' then, otherwise execution in step A55 ';

Steps A 54 ', described receiving terminal to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, finishes described the 3rd originating end IP address then;

Steps A 55 ', described receiving terminal to as to set up the originating end IP address that point-to-point communication is connected right with described originating end, finishes described the 4th originating end IP address then.

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