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Method for achieving message-crossing network address translation device

A technology of network address translation and external network equipment, which is applied in the field of realizing message traversal of network address translation equipment, and can solve problems such as inability to perform port address translation

Inactive Publication Date: 2013-03-20
OPZOON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is the problem that the port address translation cannot be performed without adding UDP in the NAT traversal of the Internet protocol security (IPSec) tunnel

Method used

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  • Method for achieving message-crossing network address translation device
  • Method for achieving message-crossing network address translation device
  • Method for achieving message-crossing network address translation device

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0023] The present invention proposes a method for realizing message traversal of network address translation equipment. The method is used in the situation where an ESP (Encapsulate Security Payload) message is first sent from the internal network to the external network. When sending an ESP message, the ESP message carries an external network security parameter index, an internal network IP address, and an internal network security parameter index (SecurityParameter Index, SPI). When the ESP message passes through the NAT device, according to the ESP message The carried external network security parameter index, internal network IP address and internal network security parameter index form a mapping table between the internal network IP address, SPI and public network IP addr...

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Abstract

The invention provides a method for achieving message-crossing network address translation device. The method comprises (S1) enabling an intranet to send a message to the network address translation device, and enabling the message to carry an intranet internet protocol (IP) address, an intranet safety parameter index and an extranet safety parameter index; (S2) enabling the network address translation device to receive the message, and building a mapping table according to the intranet IP address, the intranet safety parameter index and the extranet safety parameter index which the message carries and a public network IP address; and (S3) enabling the intranet IP address of the message to be converted into the public network IP address according to the mapping table, and sending the message to an extranet device through the public network IP address; and enabling the extranet safety parameter index to be the safety parameter index of the extranet device. By building a network address translation (NAT) device address mapping, when the message in an internet protocol security (IPSec) tunnel undergoes NAT crossing, port address conversion can be performed without adding a user datagram protocol (UDP).

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for realizing message traversal through network address conversion equipment. Background technique [0002] Network Address Translation (NAT) is a wide area network (WAN) access technology. It is a conversion technology that converts an internal network IP address into a public network IP address. It is widely used in various types of Internet access methods and various types of networks. Due to the limited number of public network IP addresses in the network, a large number of NAT devices are used in the network to undertake the task of converting internal network and external network IP addresses and ports to alleviate the limited problem of public network IP addresses. [0003] In the prior art, a virtual private network (Virtual Private Network, VPN) device uses a method of adding a UDP 4500 header to the ESP message to solve the problem that the port ...

Claims

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Application Information

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IPC IPC(8): H04L12/741H04L29/12H04L45/74
Inventor 陈海滨
Owner OPZOON TECH
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