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Method and equipment for forwarding traffic of multi-NAT (network address translation) gateway

A technology of gateway device and forwarding device, applied in the field of communication, can solve the problems such as the inability of security policies and logs to take effect, and the inability of the application server to identify the real address of public network devices.

Active Publication Date: 2012-02-15
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the application server cannot recognize the real address of the public network device, resulting in some security policies and logs not taking effect

Method used

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  • Method and equipment for forwarding traffic of multi-NAT (network address translation) gateway
  • Method and equipment for forwarding traffic of multi-NAT (network address translation) gateway
  • Method and equipment for forwarding traffic of multi-NAT (network address translation) gateway

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Embodiment Construction

[0052] by figure 1 Referring to the schematic diagram of the network model for the present invention, the present invention proposes a method for multi-NAT gateway traffic forwarding. In the system of devices (that is, multi-NAT gateways), take VRRP enabled between multiple gateway devices, and the virtual address of VRRP is the default gateway of the application server as an example; the actual application is not limited to the above-mentioned VRRP networking, Aiming at the problem of inconsistency of paths for receiving data and sending data caused by gateway devices with multiple exits, the technical solution provided by the present invention can be used to solve the problem.

[0053] Such as figure 2 As shown, the method for multi-NAT gateway traffic forwarding includes the following steps:

[0054] Step 201, the second gateway device receives second data from the public network device. The source IP address and source port of the second data are the IP address and por...

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Abstract

The invention discloses a method and equipment for forwarding a traffic of a multi-NAT (network address translation) gateway. The method comprises the following steps that when first gateway equipment receives first data from an internal network application server, the first gateway equipment inquires an NAT synchronous session table by address information carried in the first data; and if the NAT synchronous session table shows that second gateway equipment can send the first data to public network equipment, the first gateway equipment sends the first data to the second gateway equipment and the second gateway equipment sends the first data to the public network equipment. In the invention, the consistency of forwarding paths of NAT mapping data can be ensured.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and equipment for forwarding traffic of multiple NAT gateways. Background technique [0002] Due to the limited public network address resources in the actual network, the gateway device usually uses the NAT (Network Address Translation, Network Address Translation) function to achieve intranet access to the Internet. NAT is to convert the IP address in the IP datagram header into another IP The process of addressing, that is, NAT converts the private network address in the data into a public network address to realize private network access to the public network, and NAT can slow down the available address space by using a small number of public network addresses to represent more private network addresses exhausted. [0003] In the prior art, when an application server is deployed on the enterprise intranet, and the application server is open to public network d...

Claims

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Application Information

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IPC IPC(8): H04L29/08H04L29/12H04L12/56H04L12/66
Inventor 刘雄威
Owner NEW H3C TECH CO LTD