WO2016101510A1

WO2016101510A1 - Method andbroadband remote access serverdevice for acquiringnetwork address translation information

Info

Publication number: WO2016101510A1
Application number: PCT/CN2015/079114
Authority: WO
Inventors: 孟继杰; 蔡磊; 胡亿芬
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-12-23
Filing date: 2015-05-15
Publication date: 2016-06-30
Also published as: CN105791452A

Abstract

Disclosed is a method for acquiring network address translation (NAT) information, the method comprising: establishing an intercommunication channel between a broadband remote access server (BRAS) device and a carrier class NAT CGN device; receiving NAT information transmitted by the CGN device via the intercommunication channel; and transmitting the NAT information to a server, such that a user looks up the NAT information via the server. Also disclosed is a BRAS device, for establishing a channel between a distributed BRAS device and an independent CGN device to transmit related information, thus facilitating directly acquiring the NAT information related to the user on the BRAS device.

Description

Method for obtaining NAT information and BRAS device

Technical field

The present invention relates to the field of communications, and in particular, to a method for obtaining network address translation (NAT) information and a broadband remote access server (BRAS) device.

Background technique

Currently, there are multiple deployment scenarios for carrier-Grade NAT (Carrier-Grade NAT). One of the deployment scenarios is as follows: Broadband Remote Access Server (BRAS) device completes user access, and independent CGN. Connect the BRAS device next to the device, or connect the BRAS device under CGN and connect to the Internet. In this scenario, the BRAS device performs the user access function, while the CGN device completes the NAT translation. BRAS devices and CGN devices are relatively opposite.

In the prior art, the network address translation (NAT) related information of the user cannot be obtained on the distributed BRAS device. Therefore, it is not conducive to user traceability.

Summary of the invention

The embodiment of the invention provides a method for acquiring NAT information and a BRAS device, so as to at least solve the technical problem that the existing BRAS device cannot obtain the NAT related information of the user.

To achieve at least the foregoing, the embodiment of the present invention provides a method for obtaining NAT information, where the method includes:

Establish an interworking channel between the broadband remote access server BRAS device and the carrier-grade NAT CGN device;

Receiving, by the interworking channel, NAT information sent by the CGN device;

The NAT information is sent to the server, so that the user searches for the NAT information through the server.

After receiving the NAT information sent by the CGN device by using the interworking channel, the method further includes:

The NAT information is stored.

The storing the NAT information includes:

A correspondence table between the user identification information and the NAT information is stored.

The interworking channel is an ingress GRE tunnel.

The method further includes:

Control information is sent to the CGN device, the control information being set to limit the number of NAT sessions for the user.

In addition, in order to achieve at least the foregoing, the embodiment of the present invention further provides a BRAS device, where the BRAS device includes:

Establishing a unit, configured to establish an interworking channel between the broadband remote access server BRAS device and the carrier-grade NAT CGN device;

a receiving unit, configured to receive, by using the interworking channel, NAT information sent by the CGN device;

The first sending unit is configured to send the NAT information to the server, so that the user searches for the NAT information through the server.

The BRAS device further includes:

a storage unit configured to store the NAT information.

The storage unit is configured to:

Storing a correspondence table between the user identification information and the NAT information;

The first sending unit is configured to:

Sending a correspondence table between the user identification information and the NAT information to the server.

The BRAS device further includes:

The second sending unit is configured to send control information to the CGN device, and the control information is set to limit the number of NAT sessions of the user.

The embodiment of the present invention establishes an interworking channel between the broadband remote access server BRAS device and the carrier-grade NAT CGN device, and receives the NAT information sent by the CGN device through the interworking channel, and sends the NAT information to the server. In order to enable the user to find the NAT information through the server, a channel is established between the distributed BRAS device and the free-standing CGN device to transmit relevant information, thereby conveniently acquiring user-related NAT information directly on the BRAS device. .

DRAWINGS

1 is a schematic flowchart of a first embodiment of a method for obtaining NAT information according to the present invention;

2 is a schematic flowchart of a second embodiment of a method for obtaining NAT information according to the present invention;

3 is a schematic flowchart of a third embodiment of a method for obtaining NAT information according to the present invention;

4 is a schematic flowchart of a fourth embodiment of a method for obtaining NAT information according to the present invention;

5 is a schematic diagram of functional modules of a first embodiment of a BRAS device according to the present invention;

6 is a schematic diagram 1 of a functional module of a second embodiment of a BRAS device according to the present invention;

7 is a second schematic diagram of a functional module of a second embodiment of a BRAS device according to the present invention;

FIG. 8 is a schematic structural diagram of a system according to a first embodiment of a system for acquiring NAT information according to the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiments of the present invention provide a method for acquiring NAT information.

Referring to FIG. 1, FIG. 1 is a schematic flowchart diagram of a first embodiment of a method for obtaining NAT information according to the present invention.

In the first embodiment, the method for obtaining NAT information includes:

Step 101: Establish an interworking channel between the broadband remote access server BRAS device and the carrier-grade NAT CGN device.

Specifically, user-related configuration is performed on a Broadband Remote Access Server (BRAS) device, and network address translation is performed on a carrier-grade NAT (CGN) device (Network Address Translation). , NAT) related configuration, for example, configuring a portrange block. A GRE tunnel is established between the BRAS device and the standalone CGN device. The PC terminal dials up through PPPoE and allocates an IP private network address on the BRAS device. After the traffic reaches the CGN device, the CGN device allocates a portrange block for the user, completes the NAT translation, and sends the packet to the Internet.

Preferably, the interworking channel is an ingress GRE tunnel.

Specifically, an interworking channel is established between the BRAS device and the standalone CGN device: into the GRE tunnel. This channel is mainly used to transfer NAT-related information between BRAS devices and stand-alone CGN devices.

Step 102: Receive, by using the interworking channel, NAT information sent by the CGN device.

Specifically, after the CGN device allocates the portrange block to the user, the information of the portrange block is transmitted to the BRAS device through the established GRE tunnel, and is sent to the relevant user.

Step 103: Send the NAT information to a server, so that the user searches for the NAT information through the server.

Specifically, the BRAS device stores information about the portrange block of the user, and the information of the portrange block can be uploaded to the radius server according to the configuration.

Referring to FIG. 2, FIG. 2 is a schematic flowchart diagram of a second embodiment of a method for obtaining NAT information according to the present invention.

In the second embodiment, after step 102, the method further includes:

Step 104: Store the NAT information.

Specifically, after the CGN device allocates the portrange block to the user, the information of the portrange block is transmitted to the BRAS device through the established GRE tunnel, and the BRAS device stores the portrange information of the user.

Preferably, the storing the NAT information includes:

The sending the NAT information to the server includes:

Specifically, on the BRAS device, the information about the received portrange block is stored in the user table, and the information of the portrange block is uploaded to the radius server according to the configuration requirement. Operators can easily get from The radius server looks at the information of the portrange block used by the user to complete the traceability to the user. The information of the correspondence table takes the keyword information of the user as a key value, such as the private IP address of the user.

Referring to FIG. 3, FIG. 3 is a schematic flowchart diagram of a third embodiment of a method for obtaining NAT information according to the present invention.

In the third embodiment, the method further includes step 105. Step 105 is not limited to before or after steps 101 to 104, and step 105 is followed by step 104 as an example:

Step 105: Send control information to the CGN device, where the control information is set to limit the number of NAT sessions of the user.

Specifically, if the operator wants to limit the maximum number of sessions per private network user, the maximum number of sessions of the user can be limited by configuration on the BRAS device. The control information is sent to the CGN device through the GRE channel. After receiving the control information, the CGN device finds the corresponding private network user and sets the maximum number of sessions of the private network user, and can also control other NAT behaviors.

The embodiment of the present invention establishes an interworking channel between the broadband remote access server BRAS device and the carrier-grade NAT CGN device, and receives the NAT information sent by the CGN device through the interworking channel, and sends the NAT information to the server. In order to enable the user to find the NAT information through the server, a channel is established between the distributed BRAS device and the free-standing CGN device to transmit relevant information, thereby conveniently acquiring user-related NAT information directly on the BRAS device. And control over the user's NAT behavior.

Referring to FIG. 4, FIG. 4 is a schematic flowchart diagram of a fourth embodiment of a method for obtaining NAT information according to the present invention.

Step 401: Establish an interworking channel between the BRAS device and the standalone CGN device: into the GRE tunnel. The channel is mainly used to transfer NAT related information between the BRAS device and the standalone CGN device;

In step 402, the first stream of the user flows, and the user is online on the BRAS device, and then the NAT is performed on the CGN device.

Step 403: The NAT information is transmitted back to the BRAS device through an interworking channel established between the BRAS device and the CGN device. The information passed is the key information of the user, such as the private IP address of the user;

Step 404: On the BRAS device, after receiving the NAT information, the user updates the user's key value information to the corresponding user table, and may also report part of the information to the radius server according to the situation. For example, the port block information allocated by the user can help the operator to easily implement the user traceability.

In step 405, the operator can set the NAT session number limit for the private network user through the BRAS, and pass the control information to the independent CGN device through the interworking channel, thereby controlling the number of the user NAT entries.

The embodiment of the invention provides a BRAS device.

Referring to FIG. 5, FIG. 5 is a schematic diagram of functional modules of a first embodiment of a BRAS device according to the present invention.

The establishing unit 501 is configured to establish an interworking channel between the broadband remote access server BRAS device and the carrier-grade NAT CGN device;

Specifically, the user-related configuration is completed on the BRAS device, and the NAT-related configuration is completed on the stand-alone CGN device, for example, the portrange block is configured. A GRE tunnel is established between the BRAS device and the standalone CGN device. The PC terminal dials up through PPPoE and allocates an IP private network address on the BRAS device. After the traffic reaches the CGN device, the CGN device allocates a portrange block for the user, completes the NAT translation, and sends the packet to the Internet.

Preferably, the interworking channel is an ingress GRE tunnel.

The receiving unit 502 is configured to receive, by using the interworking channel, NAT information sent by the CGN device;

The first sending unit 503 is configured to send the NAT information to the server, so that the user searches for the NAT information through the server.

Referring to FIG. 6, FIG. 6 is a schematic diagram 1 of a functional module of a second embodiment of a BRAS device according to the present invention.

In the second embodiment, the BRAS device further includes:

The storage unit 504 is configured to store the NAT information.

Preferably, the storage unit 504 is configured to:

The first sending unit 503 is configured to:

Specifically, on the BRAS device, the information about the received portrange block is stored in the user table, and the information of the portrange block is uploaded to the radius server according to the configuration requirement. The operator can conveniently view the information of the portrange block used by the user from the radius server, thereby completing the traceability to the user. The information of the correspondence table takes the keyword information of the user as a key value, such as the private IP address of the user.

Referring to FIG. 7, FIG. 7 is a second schematic diagram of a functional module of a second embodiment of a BRAS device according to the present invention.

In the third embodiment, the BRAS device further includes a second sending unit 505, and the second sending unit 505 is not limited to before or after 501 to 504, and is described below by taking 505 after 504 as an example:

The second sending unit 505 is configured to send control information to the CGN device, and the control information is set to limit the number of NAT sessions of the user.

Specifically, if the operator wants to limit the maximum number of sessions per private network user, the maximum number of sessions of the user can be limited by configuration on the BRAS device. The control information is sent to the CGN device through the GRE channel. After receiving the control information, the CGN device finds the corresponding private network user and sets the maximum number of sessions of the private network user. It can also control other NAT behaviors.

Embodiments of the present invention provide a system for acquiring NAT information.

Referring to FIG. 8, FIG. 8 is a schematic structural diagram of a system according to a first embodiment of a system for acquiring NAT information according to the present invention.

The system consists of a stand-alone CGN device, a BRAS device, a CR device, and a PC terminal with network communication capabilities.

Complete the user-related configuration on the BRAS device, complete NAT-related configuration (configure portrange) on the stand-alone CGN device, and establish a GRE tunnel between the BRAS device and the stand-alone CGN device.

The PC terminal dials up through PPPoE and allocates an IP private network address on the BRAS device. After that, the traffic reaches the CGN device, and the CGN device allocates a portrange block to the user, and completes the NAT translation and sends it to the Internet network.

After the CGN device allocates the portrange block to the user, the portrange information is transmitted to the BRAS device through the established GRE tunnel and sent to the relevant user. At this point, the user table has the portrange information of the user, and the portrange information can be uploaded to the radius server according to the configuration.

On the BRAS device, the user receives the relevant portrange information and stores it in the user table, and uploads the portrange information to the radius server according to the configuration requirements.

The operator can conveniently view the port block information used by the user from the radius server to complete the traceability to the user.

If the operator wants to limit the maximum number of sessions per private network user, you can configure the maximum number of sessions for the user on the BRAS device. The control information is sent to the CGN device through the GRE channel. After receiving the control information, the CGN device finds the corresponding private network user and sets the maximum number of sessions of the private network user. It is also possible to control other NAT behaviors.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Industrial applicability

As described above, the method for obtaining NAT information and the BRAS device provided by the embodiments of the present invention have the following beneficial effects: establishing an interworking channel between a broadband remote access server BRAS device and a carrier-grade NAT CGN device; The interworking channel receives the NAT information sent by the CGN device, and sends the NAT information to the server, so that the user searches for the NAT information through the server, so as to establish a relationship between the distributed BRAS device and the independent CGN device. The channel is used to transmit relevant information, so that the user-related NAT information can be directly obtained on the BRAS device.

Claims

A method for obtaining network address translation NAT information, the method comprising:

Establish an interworking channel between the broadband remote access server BRAS device and the carrier-grade NAT CGN device;

Receiving, by the interworking channel, NAT information sent by the CGN device;

The NAT information is sent to the server, so that the user searches for the NAT information through the server.
The method according to claim 1, wherein after receiving the NAT information sent by the CGN device through the interworking channel, the method further includes:

The NAT information is stored.
The method of claim 2, wherein said storing said NAT information comprises:

A correspondence table between the user identification information and the NAT information is stored.
The method of claim 1 wherein said interworking channel is an incoming GRE tunnel.
The method according to any one of claims 1 to 4, wherein the method further comprises:

Control information is sent to the CGN device, the control information being set to limit the number of NAT sessions for the user.
A broadband remote access server BRAS device, the BRAS device comprising:

Establishing a unit, configured to establish an interworking channel between the broadband remote access server BRAS device and the CGN device;

a receiving unit, configured to receive, by using the interworking channel, NAT information sent by the CGN device;

The first sending unit is configured to send the NAT information to the server, so that the user searches for the NAT information through the server.
The BRAS device of claim 6, wherein the BRAS device further comprises:

a storage unit configured to store the NAT information.
The BRAS device according to claim 7, wherein said storage unit is configured to:

A correspondence table between the user identification information and the NAT information is stored.
The BRAS device of claim 6, wherein the interworking channel is an ingress GRE tunnel.
The BRAS device according to any one of claims 6 to 9, wherein the BRAS device further comprises:

The second sending unit is configured to send control information to the CGN device, and the control information is set to limit the number of NAT sessions of the user.