WO2010111962A1

WO2010111962A1 - Method, apparatus and system for discovering carrier grade network address translation (cgn) device

Info

Publication number: WO2010111962A1
Application number: PCT/CN2010/071517
Authority: WO
Inventors: 郭大勇
Original assignee: 华为技术有限公司
Priority date: 2009-04-03
Filing date: 2010-04-02
Publication date: 2010-10-07
Also published as: CN101854285A

Abstract

A method, apparatus and system for discovering a Carrier Grade Network Address Translation (CGN) device relate to the field of network communication. The method comprises: sending a message carrying the information of the CGN device to a client device, thus the client device can establish a tunnel with the CGN device according to the information which includes the type information and the address information of the CGN device. The technical solution of the present invention adopts the network device to send the message carrying CGN device information to the client device, enables the client device to obtain the type and address information of the CGN device and establish a tunnel with the CGN device according to the CGN device information, thus solves the problem about discovering the CGN device.

Description

Carrier-class network address translation device discovery method, device and system

This application is filed on April 3, 2009, and is filed on the Chinese Patent Office, Application No. 200910106518. 2. The priority of the Chinese patent application entitled "Operational Network Address Translation Device Discovery Method, Equipment and System", all of which are The content is incorporated herein by reference. The present invention relates to the field of network communications, and in particular, to a carrier-level network address translation device discovery method, device, and system. BACKGROUND With the rapid popularization of network terminal, a growing number of network devices access to the Internet, you need an Internet Protocol (Internet Protocol, IP) address for communication, leading to Internet Protocol version currently used (IPv ⁴⁾ IP address of the gradual consumption Do it. The sixth edition of the Internet Protocol (IPv6) has been recognized as the core standard for the next generation of the Internet.

Users who switch to an IPv6 network due to insufficient addresses expect to have normal access to the current IPv4 network, and existing IPv4 devices are difficult to upgrade to IPv6 devices immediately due to the huge upgrade cost. Therefore, the evolution from IPv4 to IPv6 requires a long-term process. At present, the general view of this evolution process has changed from "IPv4 to IPv6 transition" to "IPv4 and IPv6 coexistence".

In order to support network interworking in the IPv4 to IPv6 evolution process, researchers have proposed a variety of interworking technologies, including dual-Stack, tunnel, and Translat. However, these technologies have not been used in many years for development, and the promotion of the IPv4 to IPv6 evolution process is limited. Dual-stack technology is the easiest, but the cost of upgrading all network infrastructure, services, applications, and user terminals to dual stacks is extremely high. Tunnel technology and translation technology There are many different types, but each technology can only be used in specific evolution scenarios. Its technically complex features determine that most users have difficulty identifying and selecting the technology that suits them.

Carrier-class Network Address Translation (CGN) is a device deployed in a carrier-class network by integrating multiple evolutions including tunneling and Network Address Translating (NAT). Mechanisms to improve the smooth transition of IPv4 and IPv6 and advance the evolution process. The current CGN technology has various solutions. For example, one is a CGN in a lightweight dual stack, which supports an IPv6 encapsulated IPv4 tunnel and translates an IPv4 private network address in the tunnel into a public network address; CGN sent by "address plus port number", CGN can directly assign the same public network address to different hosts through tunnel (or point-to-point link). CGN does not need address translation, but can pass "address plus port number". " Binding relationship with a tunnel (or point-to-point link) to distinguish between hosts using the same public address and send messages. Although the details of the schemes differ, the overall characteristics of the CGN are clear. The CGN device is deployed on the IPv4 network and the IPv6 network boundary. The user network or host can obtain access to the address that is not supported by the local Internet Service Provider (ISP) through the CGN device.

To support the new address version, such as IPv6, the ISP can simply deploy a CGN device. By establishing a tunnel between the client device and the CGN device, IPv6 users can easily access IPv6 Internet services and avoid large-scale upgrade of the ISP network. . Therefore, CGN can assist in the rapid deployment of IPv6 networks. In the later stage of IPv6 network evolution, the ISP can also establish a pure IPv6 network to serve a small number of distributed IPv4 users through the CGN equipment. Since the CGN supports the NAT function, it helps the ISP to solve the problem of insufficient address in the later stage of evolution. In addition, the use of a unified address family by the ISP is also beneficial to the operation and maintenance of the network.

For the user, the CGN device belongs to a centralized point of network service, so the discovery of CGN is an important process for the user to obtain the service. The user needs to know the information of the CGN device, for example, the address of the CGN device in the ISP network. The easiest way for a user to know the information of a CGN device is to manually configure the information of the CGN device on the user host. However, manual configuration is not feasible for a large number of users who are dispersed. Each user needs to memorize the information of the CGN device. Once the information of the CGN device changes, You also need to notify each user.

Therefore, there is a need for a practical solution to the problem of CGN device discovery. SUMMARY OF THE INVENTION An object of the present invention is to provide a carrier-level network address translation device discovery method, device, and system, which solves the problem found by a carrier-level network address translation device.

A method for discovering a carrier-level network address translation device according to an embodiment of the present invention includes: transmitting, to a client device, a message carrying carrier-level network address translation CGN device information, so that the client device according to the CGN device information Establishing a tunnel with the CGN device, the CGN device information including CGN device type information and address information of the CGN device.

A network device, including:

a storage module, configured to store CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device;

And a sending module, configured to send a message carrying the CGN device information to the client device, so that the client device establishes a tunnel with the CGN device according to the CGN device information.

A carrier-level network address translation method, including:

Receiving a message carrying CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device;

Establishing a tunnel with the CGN device according to the CGN device information.

A client device, including:

a receiving module, configured to receive a message carrying CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device;

And a establishing module, configured to establish a tunnel with the CGN device according to the CGN device information.

A carrier-level network address translation system includes: a CGN device and a network device; wherein the CGN device is configured to establish a tunnel with the client device, so that the client device accesses an IPv6 or IPv4 Internet service; The network device is configured to store a CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device, and is used to send a message carrying the CGN device information to the client device, so that the The client device establishes a tunnel with the CGN device according to the CGN device information.

According to the technical solution provided by the embodiment of the present invention, the network device sends a message carrying the CGN device information to the client device, so that the client device obtains the type and address information of the CGN device, and can establish a tunnel with the CGN device according to the CGN device information. , solved the problem found by carrier-class network address translation equipment. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a flowchart of a method for discovering a CGN device according to an embodiment of the present invention;

2 is a schematic diagram of a CGN setting in an embodiment of the present invention;

3 is a block diagram of a network device according to an embodiment of the present invention;

4 is a flowchart of a CGN method according to an embodiment of the present invention;

FIG. 5 is a block diagram of a client device according to an embodiment of the present invention; FIG.

FIG. 6 is a block diagram of a carrier-level network address translation system according to an embodiment of the present invention; FIG. 7 is a flowchart of a CGN device discovery method in a specific application scenario according to an embodiment of the present invention; FIG. 8 is another specific application of the embodiment of the present invention. Flowchart of the CGN device discovery method in the scenario;

FIG. 9 is a flow chart of a method for discovering a CGN device in another specific application scenario according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 6:

1 is a flow chart of a method for discovering a CGN device in an embodiment of the present invention. The method includes: 102. The network device sends a message carrying the carrier-level network address translation CGN device information to the client device. The CGN device information includes CGN device type information and address information of the CGN device. The CGN device type information may be the conversion type information supported by the CGN device, or may be the tunnel type information supported by the CGN device, and may also indicate the conversion type information supported by the CGN device and the tunnel type information supported by the CGN device. For example, the network device may be a Dynamic Hosting Protocol (DHCP) server, a point-to-point protocol (PPP) server, or an IPv6 router. The corresponding message carrying the CGN device information may be a DHCP response message, a PPP message, or an IPv6 Advertisement (RA) message. The CGN device information may also include one or more of the following: priority information of the CGN device, and tunnel inner layer information of the CGN device. For example, when the CGN device information includes all of the above information (CGN device type information, address information of the CGN device, priority information of the CGN device, and tunnel inner layer information of the CGN device), the setting can be specifically referred to FIG.

2 is a schematic diagram of information of a CGN device according to an embodiment of the present invention.

Code indicates that the information is CGN device information; Len indicates the length of the CGN device; Type field indicates CGN device type information. The CGN device type information may be a conversion type information supported by the CGN device, for example, a CGN of a lightweight dual-stack type or a CGN type based on an "Address plus port number"; the CGN device type information may also be It is the tunnel type information supported by the CGN device, such as the Layer 2 Tunneling Protocol (L2TP), the Gener ic Routing Encapsulation (GRE), and the IP Security Protocol (IP Security). IPSEC), IP in IP, or other types of tunnels that can be thought of by those skilled in the art; the CGN device type information may also indicate the type of conversion information supported by the CGN device and also indicate that the CGN device supports The tunnel type information, for example, divides the Type field into two parts, which respectively represent the conversion type information supported by the CGN device and the tunnel type information supported by the CGN device. The two parts of the Type field may also be disconnected. Use a uniform type representation, such as a conversion type is a lightweight double stack class The type of CGN and the tunnel type is L2TP is type 1, the conversion type is CGN for lightweight double-stack type, and the tunnel type is GRE for type 2, and so on. The Pref field indicates the priority information of the CGN device. When receiving multiple CGN device information, the client device can preferentially select a CGN device according to the information. The Addres s field indicates address information of the CGN device, and the address information of the CGN device may be an IPv4 address or an IPv6 address. Sub-option indicates other information needed, which may include tunnel inner layer information of the CGN device, such as protocol encapsulation allowed in the tunnel inner layer, and address used by the user side of the tunnel inner layer.

When the CGN device information does not completely include all the above information, the corresponding field can be configured by default.

104. Send a message carrying CGN device information to enable the client device to establish a tunnel with the CGN device. For example, the client device can determine whether to establish a tunnel according to requirements. If a tunnel is required, the client device can use the received CGN device information to establish a corresponding tunnel. The tunnel can be an IPv6 over IPv4 tunnel or an IPv4 over IPv6 tunnel. , IPv4 over IPv4 tunnel or IPv6 over IPv6 tunnel. For example, when the carrier network is an IPv4 network and the client device of the IPv6 address wants to access the IPv6 network, an IPv6 over IPv4 tunnel is established between the CGN device and the client device to enable the client device to access the IPv6 Internet service. When the carrier network type, the client device address, and the network type that the client device wants to access are the same, the client device may not establish a tunnel.

3 is a block diagram of a network device in an embodiment of the present invention. For example, the network device can be a DHCP server, a PPP server, or an IPv6 router. The network device includes: a storage module 302 and a sending module 304; wherein

The storage module 302 is configured to store CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device. The CGN device type information may be the conversion type information supported by the CGN device, or may be the tunnel type information supported by the CGN device, and may also indicate the conversion type information supported by the CGN device and the tunnel type information supported by the CGN device. The CGN information may be sent by the CGN device to the network device, or may be manually configured on the network device. The CGN device information may also include one or more of the following: priority information of the CGN device, Tunnel inner layer information of the CGN device.

The sending module 304 is configured to send a message carrying the CGN device information to the client device, so that the client device can establish a tunnel with the CGN device. For example, when the CGN device information includes all of the above information (CGN device type information, address information of the CGN device, priority information of the CGN device, and tunnel inner layer information of the CGN device), it can be specifically set with reference to FIG. The client device can determine whether to establish a tunnel according to requirements. If a tunnel needs to be established, the client device can use the CGN device information to establish a corresponding tunnel. The tunnel can be IPv6 over IPv4, IPv4 over IPv6, or IPv4 over IPv4 or IPv6 over. IPv6l3⁄4i£.

4 is a flow chart of a CGN method in accordance with an embodiment of the present invention. The method includes:

402. The client device receives a message carrying CGN device information. The CGN device information includes CGN device type information and address information of the CGN device. The CGN device type information may be the type of the conversion type supported by the CGN device, or the tunnel type information supported by the CGN device, and may also indicate the conversion type information supported by the CGN device and the tunnel type information supported by the CGN device. For example, the network device can be a DHCP server, a PPP server, or an IPv6 router. The CGN device information may also include one or more of the following: priority information of the CGN device, and tunnel inner layer information of the CGN device. For example, when the CGN device information includes all of the above information (CGN device type information, address information of the CGN device, priority information of the CGN device, and tunnel inner layer information of the CGN device), it can be specifically set with reference to FIG. When the CGN setting does not completely include all the above information, the corresponding field can be configured by default.

404. The client device establishes a tunnel with the CGN device according to the CGN device information. For example, the client device can determine whether to establish a tunnel, and use the CGN device information to establish a corresponding tunnel. The tunnel can be an IPv6 over IPv4, an IPv4 over IPv6 tunnel, an IPv4 over IPv4 or an IPv6 over IPv6 tunnel. For example, when the carrier network is an IPv4 network, the client device of the IPv6 address wants to access the IPv6 network, and the IPv6 over IPv4 tunnel is established between the CGN device and the client device, so that the client device can access the IPv6 Internet service. When the carrier network type, the client device address, and the network type that the client device wants to access are the same, The client device may not establish a tunnel. After obtaining the above information of the CGN device, a person skilled in the art knows how to establish a tunnel, and details are not described herein again.

FIG. 5 is a block diagram of a client device in an embodiment of the present invention. The client device includes a terminal and a customer premises equipment (CPE). For example, the terminal can be a personal computer, a mobile phone, a personal digital assistant, or the like. The customer front-end device may be a firewall, a set top box (STB), a server, a workstation, a communication hardware, such as a cable modem (DSL Modem) or a digital subscriber line modem (DSL Modem), a LAN device, such as a hub, a bridge. , switches, WAN devices such as home gateways, routers, small office home office (S0H0) routers, etc. The client device includes: a receiving module 502 and an establishing module 504;

The receiving module 502 is configured to receive a message carrying CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device. The CGN device type information may be the type information of the CGN device and the tunnel type information supported by the CGN device. The information about the type of the switch supported by the CGN device and the tunnel type information supported by the CGN device may also be indicated. The CGN device information may also include one or more of the following: priority information of the CGN device, and tunnel inner layer information of the CGN device.

The establishing module 504 is configured to establish a tunnel with the CGN device according to the CGN device information. For example, the establishing module 504 can determine whether to establish a tunnel according to requirements. If a tunnel is to be established, the tunnel is established by using the CGN device information. The tunnel can be an IPv6 over IPv4 tunnel, an IPv4 over IPv6 tunnel, or an IPv4 over IPv4 tunnel. Or an IPv6 over IPv6 tunnel. For example, when the carrier network is an IPv4 network, and the client device of the IPv6 address wants to access the IPv6 network, the CGN device 602 establishes an IPv6 over IPv4 tunnel with the client device to enable the client device to access the IPv6 Internet service. When the carrier network type, the client device address, and the network type that the client device wants to access are the same, the client device may not establish a tunnel.

6 is a block diagram of a carrier-grade network address translation system in accordance with an embodiment of the present invention. The system package Included: CGN device 602 and network device 604;

The CGN device 602 is configured to establish a tunnel with the client device to enable the client device to access the IPv6 Internet service or the IPv4 Internet service. For example, the tunnel may be an IPv6 over IPv4 |3⁄4 channel, an IPv4 over IPv6 channel, an IPv4 over IPv4 |3⁄4 channel, or an IPv6 over IPv6 tunnel. For example, when the carrier network is an IPv4 network and the client device of the IPv6 address wants to access the IPv6 network, the CGN device 602 establishes an IPv6 over IPv4 tunnel with the client device to enable the client device to access the IPv6 Internet service. When the carrier network type, the client device address, and the network type that the client device wants to access are the same, the client device may not establish a tunnel. The client device includes a terminal and a client front end device, and those of ordinary skill in the art will appreciate that the CGN device 602 can tunnel with it regardless of the client device.

The network device 604 is configured to store information of the CGN device 602, that is, CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device, and is used to send a message carrying the CGN device information to the client device. To establish a tunnel between the client device and the CGN device. The CGN settings may be sent by the CGN device 602 to the network device 604 or manually configured on the network device 604. The CGN device type information may be the type information of the CGN device and the type of the tunnel type supported by the CGN device. The information about the type of the switch supported by the CGN device and the tunnel type information supported by the CGN device may also be indicated. The CGN device information may also include one or more of the following: priority information of the CGN device, and tunnel inner layer information of the CGN device. For example, when the CGN device information includes all of the above information (CGN device type information, address information of the CGN device, priority information of the CGN device, and tunnel inner layer information of the CGN device), it can be specifically set with reference to FIG. When the CGN device information does not completely include all the above information, the corresponding field can be configured by default. The client device can decide whether to establish a tunnel according to needs, and use the above CGN device information to establish a corresponding tunnel.

A specific application scenario of the embodiment of the present invention is described below with reference to FIG. 7:

FIG. 7 is a flowchart of a CGN device discovery method in a specific application scenario according to an embodiment of the present invention. The method is applied to a scenario where the network device is a DHCP server. The method includes: 702. The DHCP server receives the DHCP request.

704. The DHCP server sends a DHCP response message carrying the carrier-level network address translation CGN device information to the client device. The CGN device information includes CGN device type information and address information of the CGN device. The CGN device type information may be the type information of the CGN device and the tunnel type information supported by the CGN device, and may also indicate the type of the conversion type supported by the CGN device and the tunnel type information supported by the CGN device. For example, the CGN device information may also include one or more of the following: priority information of the CGN device, and tunnel inner layer information of the CGN device. When the CGN device information includes all of the above information (CGN device type information, address information of the CGN device, priority information of the CGN device, and tunnel inner layer information of the CGN device), the setting can be specifically referred to in Fig. 2. When the CGN device information does not completely include all the above information, the corresponding field can be configured by default.

706. Send a message carrying CGN device information to enable the client device to establish a tunnel with the CGN device. For example, the client device may determine whether to establish a tunnel according to requirements. If a tunnel is to be established, the tunnel may be established by using the CGN device information. The tunnel may be an IPv6 over IPv4 tunnel, an IPv4 over IPv6 tunnel, or an IPv4 over IPv4 tunnel. Or an IPv6 over IPv6 tunnel.

FIG. 8 is a flow chart of a CGN device discovery method in another specific application scenario according to an embodiment of the present invention. The method is applied to a scenario where the network device is a PPP server. The method includes:

The 802, PPP server receives the PPP request.

804. The PPP server sends a PPP message carrying the carrier-level network address translation CGN device information to the client device. The CGN device information includes CGN device type information and address information of the CGN device. The CGN device type information may be the conversion type information supported by the CGN device, or may be the tunnel type information supported by the CGN device, and may also indicate the conversion type information supported by the CGN device and the tunnel type information supported by the CGN device. For example, the CGN device information may further include one or more of the following: priority information of the CGN device, and tunnel inner layer information of the CGN device. When the CGN device information includes all of the above information, it can be specifically set with reference to FIG. Letter on CGN equipment When all the above information is not completely included, the corresponding field can be configured by default.

806. Send a message carrying CGN device information to enable the client device to establish a tunnel with the CGN device. For example, the client device may determine whether to establish a tunnel according to requirements. If a tunnel is to be established, the tunnel may be established by using the CGN device information. The tunnel may be an IPv6 over IPv4 tunnel, an IPv4 over IPv6 tunnel, or an IPv4 over IPv4 tunnel. Or an IPv6 over IPv6 tunnel.

FIG. 9 is a flow chart of a method for discovering a CGN device in another specific application scenario according to an embodiment of the present invention. This method is applied to a scenario where the network device is an IPv6 router. The method includes:

902. The IPv6 router sends an IPv6 RA message carrying the carrier-level network address translation CGN device information to the client device. The CGN device information includes CGN device type information and address information of the CGN device. The CGN device type information may be the type information of the CGN device and the tunnel type information supported by the CGN device, and may also indicate the type of the conversion type supported by the CGN device and the tunnel type information supported by the CGN device. For example, the CGN device information may also include one or more of the following: priority information of the CGN device, and tunnel inner layer information of the CGN device. When the CGN device information includes all of the above information (CGN device type information, address information of the CGN device, priority information of the CGN device, and tunnel inner layer information of the CGN device), the setting can be specifically referred to in Fig. 2. When the CGN device information does not completely include all the above information, the corresponding field can be configured by default.

904. Send a message carrying CGN device information to enable the client device to establish a tunnel with the CGN device. For example, the client device may determine whether to establish a tunnel, and use the CGN device information to establish a corresponding tunnel. The tunnel may be an IPv4 over IPv6 tunnel or an IPv6 over IPv6 tunnel.

According to the technical solution provided by the embodiment of the present invention, the network device sends a message carrying the CGN device information to the client device, so that the client device obtains the type and address information of the CGN device, and can establish a tunnel with the CGN device according to the CGN device information. , solved the problem found by carrier-class network address translation equipment. A person skilled in the art can understand that all or part of the steps of implementing the above embodiments may be completed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, and the storage medium may be a ROM. /RAM, disk or CD, etc.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A carrier-level network address translation device discovery method, comprising: sending a message carrying a carrier-level network address translation CGN device information to a client device, so that the client device is configured according to the CGN device The information establishes a tunnel with the CGN device, the CGN device information including CGN device type information and address information of the CGN device.

2. The method of claim 1 wherein

The message carrying the CGN device information is a dynamic host allocation protocol DHCP response message; before the sending the DHCP response message to the client device, the method further includes receiving a DHCP request.

3. The method of claim 1 wherein:

The message carrying the CGN device information is a point-to-point protocol PPP message;

Before the sending the PPP response message to the client device, the method further includes receiving a PPP request.

4. The method of claim 1 wherein:

The message carrying the CGN device information is the Internet Protocol version 6 route advertisement IPv6 RA elimination.

The method according to any one of claims 1 to 4, wherein the CGN device type information includes:

Conversion type information supported by the CGN device; or

Tunnel type information supported by the CGN device; or

The conversion type information supported by the CGN device and the tunnel type information supported by the CGN device.

The method according to any one of claims 1 to 4, wherein the CGN device information further includes one or more of the following:

Priority information of the CGN device;

Tunnel inner layer information of the CGN device.

7. A network device, comprising:

8. The network device according to claim 7, wherein

The network device is a DHCP server; or

The network device is a PPP server; or

The network device is an IPv6 router.

9. A carrier-level network address translation method, comprising:

10. A client device, comprising:

A carrier-class network address translation system, comprising: a CGN device and a network device; wherein

The CGN device is configured to establish a tunnel with the client device, so that the client device accesses an IPv6 or IPv4 Internet service;

The network device is configured to store a CGN device information, where the CGN device information includes CGN device type information and address information of the CGN device, and is used to send a message carrying the CGN device information to the client device, so that the The client device establishes a tunnel with the CGN device according to the CGN device information.