WO2015100869A1

WO2015100869A1 - Method and apparatus for indentifying type of nat environment

Info

Publication number: WO2015100869A1
Application number: PCT/CN2014/074865
Authority: WO
Inventors: 邓钱亮; 刘峥; 范长博
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-12-30
Filing date: 2014-04-04
Publication date: 2015-07-09
Also published as: CN104754068A; CN104754068B

Abstract

Disclosed are a method and an apparatus for indentifying the type of a network address translation (NAT) environment. The method comprises: a multipoint control unit (MCU) obtaining and storing information about the type of an NAT environment where a terminal is located from an applicant layer message, the applicant layer message being sent by the first terminal querying in a sub-network segment for the type of the NAT environment of the terminal; and when the terminal receives a second application layer message that is sent by another terminal located in a same sub-network segment of the terminal and is used for querying the type of an NAT environment whether another terminal is located, the MCU feeding back the saved NAT environment type information to another terminal.

Description

NAT environment type identification method and device

The present invention relates to the field of computer technologies, and in particular, to a NAT environment type identification method and apparatus. Background technique

With the rapid development of Internet technology, every host in the world with a legitimate Internet Protocol (IP) address can share a large amount of network resources. The rapid development of the network has also greatly stimulated the strong demand for smart IP addresses from smart devices and video and audio information terminals. Due to the current development of IP address, it is difficult to replace ipv4 with ipv6 in a short time, and the development foundation of ipv4 is also very strong. Most network devices still use ipv4, so it is effective for the increasingly effective public network ipv4 address. The use is also very meaningful. As a very successful technology, Network Address Translation (NAT) can translate internal private network addresses into legitimate public IP addresses to maximize the use of valuable ipv4 addresses. The types of NAT devices mainly include the following: Full cone NAT, Address Restricted cone NAT, Port Restricted cone NAT, and Symmetric NAT.

The detection and identification of NAT device types is mainly based on the Simple Traversal of UDP over NATs (STUN) method in the Request for Amendment 3489 (equest For Comments 3489, RFC3489 for short). Allow the host (Client) behind the NAT (or multiple NAT) to find its own public IP address and find out which type of NAT it is.

For the layout features of the conference TV terminal, most of the terminals in a single site will belong to the same network segment or be behind the same NAT device, that is, the single terminal of all the sites. The NAT device forwards data to the public network. When using the traditional STU method for NAT type identification, each client must perform multiple User Datagram Protocol (UDP) data interactions to the external STUN server to determine the location of the client. What type of NAT environment is. Therefore, it is very cumbersome and inefficient for the terminal to interact with the STUN server one by one in the same subnet segment. Summary of the invention

In order to solve the existing technical problems, the embodiment of the present invention provides a NAT environment type identification method and device.

An embodiment of the present invention provides a NAT environment type identification method, including: a multi-point control unit MCU acquires and saves a first application layer message sent by a terminal in a subnet network segment to a terminal that queries a NAT environment type. The NAT environment type information of the terminal; when receiving the second application layer message of the NAT environment type in which the terminal is in the same subnet segment as the terminal, the MCU feeds back the saved information to the other terminal. NAT environment type information.

Preferably, the NAT environment type information includes: a subnet network segment where the terminal is located, site information where the terminal is located, and a corresponding NAT environment type.

Preferably, the NAT environment type information in the first application layer message is obtained by the terminal to the NAT user data packet protocol UDP simply traversing the STUN server query.

Preferably, the multi-point control unit MCU obtains and saves the NAT environment type information of the terminal from the first application layer message sent by the terminal in the subnet network segment to the terminal that queries the NAT environment type. The MCU receives the application layer query message sent by the terminal, and obtains the subnet network segment and the site information of the terminal carried in the application layer query message. The MCU determines whether there is a subnet in the application layer query message according to the pre-stored matching list. The NAT environment type corresponding to the network segment and the site information. The matching list is the mapping table between the subnet network segment, the site information, and the NAT environment type. The MCU determines that there is no subnet in the application layer query message. When the network segment and the site information correspond to the NAT environment type, determine that the terminal is the first in the subnet segment. A terminal that queries the NAT environment type, saves the subnet network segment and the site information in the application layer query message in the matching list, and sets the corresponding NAT environment type to be empty; the MCU feeds back the query response message to the terminal, where The query response message carries the subnet segment where the terminal is located, the site information, and the type of the NAT environment that is blanked. The MCU obtains the first application layer message sent by the terminal, and obtains the location of the terminal carried by the first application layer message. The subnet network segment, the site information, and the corresponding NAT environment type; the MCU updates the matching list according to the first application layer message.

Preferably, when the MCU receives the second application layer message of the NAT environment type in which the terminal is in the same subnet network segment as the request, the MCU feeds back the saved NAT environment type information to the other terminal, including: When receiving the second application layer message of the NAT environment type in which the terminal is in the same subnet segment as the terminal, the MCU determines to be carried in the second application layer message according to the pre-stored matching list. When the subnet network segment and the site environment type corresponding to the site information type, the query response message is fed back to the other terminal, where the query response message carries the subnet network segment where the terminal is located, the site information, and the corresponding NAT. Type of environment.

The embodiment of the present invention further provides a NAT environment type identification device, which is disposed in the multi-point control unit MCU, and includes: an obtaining module, configured to send, according to the first one of the subnet segments, a terminal that queries the NAT environment type The first application layer message acquires and saves the NAT environment type information of the terminal; the feedback module is configured to query the NAT environment type of the request sent by another terminal that is in the same subnet network segment as the terminal When the second application layer message is sent, the saved NAT environment type information is fed back to other terminals.

Preferably, the obtaining module is configured to: receive an application layer query message sent by the terminal, and obtain a subnet network segment and site information of the terminal carried in the application layer query message; The matching list determines whether there is a NAT environment type corresponding to the subnet network segment and the site information in the application layer query message, where the matching list is a mapping table between the subnet network segment, the site information, and the NAT environment type. When determining that there is no NAT environment type corresponding to the subnet segment and the site information in the application layer query message, determining that the terminal is the first terminal in the subnet segment to query the NAT environment type, The subnet network segment and the site information in the application layer query message are saved in the matching list, and the corresponding NAT environment type is set to be empty. The query response message is fed back to the terminal, where the query response message carries the subnet where the terminal is located. The network segment, the site information, and the NAT environment type of the bearer; obtain the first application layer message sent by the terminal, obtain the subnet network segment where the terminal carried by the first application layer message is located, the site information, and the corresponding NAT environment type. ; Update the match list based on the first application layer message.

Preferably, the feedback module is configured to: when receiving a second application layer message sent by another terminal that is in the same subnet network segment as the terminal to query the NAT environment type in which the terminal is located, determine the presence and the presence according to the pre-stored matching list. When the subnet network segment carried in the second application layer message and the NAT environment type corresponding to the site information, the query response message is fed back to the other terminal, where the query response message carries the subnet network segment where the terminal is located, Venue information, and the corresponding NAT environment type.

The embodiment of the present invention further provides a computer readable storage medium, the storage medium comprising a set of instructions for performing a NAT environment type identification method according to an embodiment of the present invention.

The beneficial effects of the embodiments of the present invention are as follows:

By querying the server with the MCU as the application-level NAT environment type, the terminal queries the MCU for the NAT type and obtains the result, which solves the problem that the terminal is cumbersome to interact with the STU server one by one in the same subnet segment in the prior art, and can improve the terminal. Automatically identify the efficiency of the network NAT environment in which it resides. DRAWINGS

Various other advantages and benefits are obtained by reading the detailed description of the preferred embodiments below. Those of ordinary skill in the art will become apparent. The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting. Throughout the drawings, the same reference numerals are used to refer to the same parts. In the drawing:

1 is a flowchart of a NAT environment type identification method according to an embodiment of the present invention;

2 is a flowchart of a detailed processing of a NAT environment type identification method according to an embodiment of the present invention; and FIG. 3 is a schematic structural diagram of a NAT environment type identification apparatus according to an embodiment of the present invention. detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, it is understood that the present invention may be embodied in various forms and not limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be more fully understood.

According to the network topology of the conference TV terminal, the conference terminals of each conference site are connected to the Multi Control Unit (MCU). For each terminal in the conference site, if a certain server is stored. The NAT type of the subnet on which the subnet is located can directly query the network type through the application layer message, and does not need to perform a complex UDP packet interaction with the STUN server to determine the NAT environment in which the terminal is currently located, and the MCU. The above speciality of the network topology in the conference television determines that it can become the NAT type query server. Based on this, the present invention provides a terminal automatic identification NAT type processing method, which realizes whether the terminal quickly recognizes whether it is in the startup state. NAT environment and its type, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Method embodiment

According to an embodiment of the present invention, a NAT environment type identification method is provided. FIG. 1 is a flowchart of a NAT environment type identification method according to an embodiment of the present invention. The NAT environment type identification method of the embodiment includes the following processing:

Step 101: The MCU obtains and saves the NAT environment type information of the terminal from the first application layer message sent by the terminal in the subnet network segment to the terminal that queries the NAT environment type. The NAT environment type information includes: The subnet network segment where the terminal is located, the site information where the terminal is located, and the corresponding NAT environment type. The NAT environment type information in the first application layer message is obtained by the terminal querying the STU server of the NAT. Specifically, the terminal obtains the type of NAT according to the traditional RFC3489 interaction with the STUN server UDP packet.

Preferably, step 101 specifically includes the following processing:

The MCU receives the application layer query message sent by the terminal, and obtains the subnet network segment and the site information of the terminal carried in the application layer query message;

The MCU determines, according to the pre-stored matching list, whether there is a NAT environment type corresponding to the subnet network segment and the site information in the application layer query message, where the matching list is between the subnet network segment, the site information, and the NAT environment type. Corresponding relationship table; when determining the existence of the NAT environment type corresponding to the subnet network segment and the site information, the MCU feeds back the NAT environment type corresponding to the subnet network segment and the site information to the terminal;

When determining that there is no NAT environment type corresponding to the subnet network segment and the site information in the application layer query message, the MCU determines that the terminal is the first terminal in the subnet segment to query the NAT environment type, The subnet network segment and the site information in the application layer query message are saved in the matching list, and the corresponding NAT environment type is set to be empty; the MCU feeds back the query response message to the terminal, where the query response message carries the terminal where the terminal is located. The subnet network segment, the site information, and the nulled NAT environment type; the MCU obtains the first application layer message sent by the terminal, and obtains the subnet network segment where the terminal carried by the first application layer message is located, the site information, and the corresponding NAT environment type; The MCU updates the matching list according to the first application layer message.

Step 102: The MCU feeds back the saved NAT environment type information to other terminals when receiving the second application layer message of the NAT environment type in which the terminal is in the same subnet segment as the terminal. Preferably, step 102 specifically includes the following processing:

When receiving the second application layer message of the NAT environment type in which the terminal is in the same subnet segment as the terminal, the MCU determines to be carried in the second application layer message according to the pre-stored matching list. When the subnet network segment and the site environment type corresponding to the site information type, the query response message is fed back to the other terminal, where the query response message carries the subnet network segment where the terminal is located, the site information, and the corresponding NAT. Type of environment.

The technical solution of the embodiment of the present invention can be applied to a conference television terminal to automatically identify the type of the NAT environment in which it is located.

The foregoing technical solution of the embodiment of the present invention is described in detail with reference to the accompanying drawings. FIG. 2 is a flowchart of the detailed processing of the NAT environment type identification method according to the embodiment of the present invention. As shown in FIG. 2, the following specifically includes the following processing:

Step 20: The terminal first sends an application layer level query message to the MCU, where the attached information is the site information and the subnet IP of the terminal.

Step 21: The MCU receives the query message sent by the terminal, and according to the matching table of the site and subnet IP and the NAT type saved by the terminal, the table analyzes the table, and if the matching result is obtained, the NAT type is written into the application layer feedback message content. After the feedback to the terminal host; if the corresponding NAT type is not found in the table, the terminal is currently the first to query the MCU for the NAT type of the subnet. The MCU saves the subnet IP and the site information to the MCU. In the matching table, the NAT type is set to null. After the terminal sends the update message, the NAT type is modified, and the null NAT type is fed back to the query terminal.

Step 22: After the step 21 is executed, the terminal host receives the NAT type sent by the MCU. If the NAT type is not empty, the process proceeds to step 23. Otherwise, the type of the current NAT is obtained by using the STUN method, and the type is obtained. And the subnet IP of the terminal and the site where the terminal is located are sent to the MCU to update its matching table.

Step 23: After the step 22 is executed, the terminal notifies the terminal network processing module of the obtained NAT type. In summary, the embodiment of the present invention introduces an MCU as an application layer-level NAT environment type query server, and if the terminal of the same subnet segment is configured to configure the NAT type of the network environment for the first time, if it is not the first site of the site and the subnet segment When querying the NAT type to the MCU, you only need to obtain the NAT type directly. This avoids the tedious decision process of the terminal interacting with the STUN server one by one, and improves the efficiency of configuring the network information of the terminal.

Device embodiment

According to an embodiment of the present invention, a NAT environment type identifying apparatus is provided, which is disposed in an MCU, and can be applied to a conference television terminal to automatically identify a NAT environment type in which it is located. FIG. 3 is a NAT environment type identification according to an embodiment of the present invention. The structure of the device is as shown in FIG. 3. The NAT environment type identifying device according to the embodiment of the present invention includes: an obtaining module 30 and a feedback module 32. The modules of the embodiments of the present invention are described in detail below.

The obtaining module 30 is configured to acquire and save the NAT environment type information of the terminal from the first application layer message sent by the first one of the subnet segments to the terminal that queries the NAT environment type; wherein, the NAT environment The type information includes: the subnet network segment where the terminal is located, the site information where the terminal is located, and the corresponding NAT environment type. The NAT environment type information in the first application layer message is obtained by the terminal querying the NAT STUN server.

The acquisition module 30 is configured to:

Receiving an application layer query message sent by the terminal, and obtaining the subnet network segment and the site information where the terminal carried in the application layer query message is located;

And determining, according to the pre-stored matching list, a NAT environment type corresponding to the subnet network segment and the site information in the application layer query message, where the matching list is between the subnet network segment, the site information, and the NAT environment type. Correspondence table

When it is determined that there is no NAT environment type corresponding to the subnet network segment and the site information in the application layer query message, determining that the terminal is the first terminal in the subnet segment to query the NAT environment type, the application is applied. The subnet segment and site information in the layer query message are saved in the matching list, and the corresponding NAT environment type is blank. The query response message is sent to the terminal, where the query response message carries the subnet network segment where the terminal is located, the site information, and the NAT environment type that is blanked;

Acquiring the first application layer message sent by the terminal, obtaining the subnet network segment where the terminal carried by the first application layer message is located, the site information, and the corresponding NAT environment type;

The matching list is updated according to the first application layer message.

The feedback module 32 is configured to: when receiving a second application layer message of the NAT environment type in which the terminal is in the same subnet network segment as the request, query the saved NAT environment type information to the other terminal.

The feedback module 32 is configured to: when receiving a second application layer message sent by another terminal that is in the same subnet network segment as the terminal to query the NAT environment type, the presence and the second are determined according to the pre-stored matching list. When the subnet segment and the site information of the site information carried in the application layer message are sent to the other terminal, the query response message is sent to the other terminal, where the query response message carries the subnet segment and the site information of the terminal. And the corresponding NAT environment type.

It should be noted that the foregoing obtaining module 30 may be a Central Processing Unit (CPU), a Micro Processing Unit (MPU) or a Digital Signal Processor (DPS). To achieve, the feedback module 32 can be implemented by a chip having a communication function in the NAT environment type identification device.

A method for identifying a NAT environment type according to an embodiment of the present invention, the embodiment of the present invention further provides a computer readable storage medium, where the storage medium includes a set of instructions for performing a NAT environment type identification method according to an embodiment of the present invention. .

In summary, the embodiment of the present invention introduces an MCU as an application layer-level NAT environment type query server, and if the terminal of the same subnet segment is configured to configure the NAT type of the network environment for the first time, if it is not the first site of the site and the subnet segment When querying the NAT type to the MCU, you only need to obtain the NAT type directly. This avoids the tedious decision process of the terminal interacting with the STUN server one by one, and improves the efficiency of configuring the network information of the terminal.

Those skilled in the art will appreciate that embodiments of the present invention may be provided as a method, system, Or a computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer usable storage medium (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart and/or block diagrams, and combinations of flow and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing device processor to produce a machine such that a flow or a block diagram of a flow or a block diagram or A device that has multiple functions specified in the box.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention Industrial applicability

The present invention solves the problem that the terminal interacts with the STU server one by one in the same subnet segment in the prior art by querying the server by using the MCU as the application layer-level NAT environment type, and the terminal can solve the problem of the cumbersome interaction between the terminals and the STU server in the same subnet segment in the prior art. It can improve the efficiency of the terminal automatically identifying the network NAT environment in which it is located.

Claims

claims

1. A network address translation NAT environment type identification method, including:

The multipoint control unit MCU obtains and saves the NAT environment type information of the terminal from the first application layer message sent by the first terminal in a certain subnet segment that queries the NAT environment type; When receiving the second application layer message of the NAT environment type, the stored NAT environment type information is fed back to the other terminal.

2. The method of claim 1, wherein the NAT environment type information includes: the subnet segment where the terminal is located, the venue information where the terminal is located, and the corresponding NAT environment type.

3. The method of claim 1, wherein the NAT environment type information in the first application layer message is obtained by the terminal simply querying the NAT User Data Packet Protocol UDP through the STU server.

4. The method of claim 1, wherein the MCU obtains and saves the location of the terminal from the first application layer message sent by the first terminal in a certain subnet segment to query the NAT environment type. NAT environment type information, including:

The MCU receives the application layer query message sent by the terminal, and obtains the subnet segment and venue information where the terminal is located carried in the application layer query message;

The MCU determines whether there is a NAT environment type corresponding to the subnet segment and the venue information in the application layer query message according to a pre-stored matching list, where the matching list is the subnet segment, venue Information, and the correspondence table between NAT environment types;

When the MCU determines that there is no NAT environment type corresponding to the subnet segment and the venue information, the MCU determines that the terminal is the first terminal in the subnet segment to query the NAT environment type, Then the subnet network segment and venue information in the application layer query message are saved. In the matching list, leave the corresponding NAT environment type blank;

The MCU feeds back a query response message to the terminal, wherein the query response message carries the subnet segment where the terminal is located, venue information, and a blank NAT environment type;

The MCU obtains the first application layer message sent by the terminal, and obtains the subnet segment where the terminal is located, venue information, and the corresponding NAT environment type carried in the first application layer message;

The MCU updates the matching list according to the first application layer message.

5. The method of claim 4, wherein, when the MCU receives a second application layer message from another terminal in the same subnet segment as the terminal requesting to query the type of NAT environment in which it is located, , feedback the saved NAT environment type information to the other terminals, including: When requesting to query the second application layer message of the NAT environment type in which it is located, it is determined according to the pre-stored matching list that there is a message related to the second application When the subnet segment carried in the layer message and the NAT environment type corresponding to the venue information are fed back to the other terminals, the query response message carries the subnet segment where the terminal is located. , venue information, and corresponding NAT environment type.

6. A network address translation NAT environment type identification device, installed in the multi-point control unit MCU, including:

The acquisition module is configured to obtain and save the NAT environment type information of the terminal from the first application layer message sent by the first terminal in a certain subnet segment that queries the NAT environment type;

A feedback module configured to, when receiving a second application layer message sent by other terminals in the same subnet segment as the terminal requesting to query the type of NAT environment in which it is located, feedback the saved said information to the other terminal. NAT environment type information.

7. The device according to claim 6, wherein the NAT environment type information includes: the subnet segment where the terminal is located, the venue information where the terminal is located, and the corresponding NAT environment type.

8. The device according to claim 6, wherein the NAT environment type information in the first application layer message is obtained by the terminal through simple query to the NAT User Data Packet Protocol UDP through the STU server.

9. The device of claim 6, wherein the acquisition module is configured to: receive an application layer query message sent by a terminal, and obtain the subnet segment where the terminal is located carried in the application layer query message. and venue information;

Determine whether there is a NAT environment type corresponding to the subnet network segment and the venue information according to a pre-stored matching list, where the matching list is the relationship between the subnet network segment, the venue information, and the NAT environment type. Correspondence table;

When it is determined that there is no NAT environment type corresponding to the subnet segment and the venue information, and it is determined that the terminal is the first terminal in the subnet segment to query the NAT environment type, then all The subnet segment and venue information in the application layer query message are stored in the matching list, and the corresponding NAT environment type is left blank;

Feed back a query response message to the terminal, wherein the query response message carries the subnet segment where the terminal is located, venue information, and a blank NAT environment type;

Obtain the first application layer message sent by the terminal, obtain the subnet segment where the terminal is located, venue information, and the corresponding NAT environment type carried in the first application layer message;

The matching list is updated according to the first application layer message.

10. The device of claim 9, wherein the feedback module is configured to: when receiving a second application layer message of the NAT environment type in which it is located, determine whether there is a message related to the second application layer according to a pre-stored matching list. When the NAT environment type corresponding to the subnet network segment and venue information carried in the message is determined, a query response message is fed back to the other terminals, wherein the query response message is The query response message carries the subnet segment where the terminal is located, venue information, and the corresponding NAT environment type.

11. A computer-readable storage medium, the storage medium includes a set of instructions, the instructions are used to execute the network address translation NAT environment type identification method described in any one of claims 1-5.