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Method for using immediate information software by data detection network address switching equipment

A technology of network address translation and data detection, which is applied in the field of data detection network address translation equipment using instant messaging software, to achieve the effect of improving anti-evasion ability, improving processing ability and improving accuracy

Inactive Publication Date: 2006-08-02
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no effective NAT detection method in all scenarios. People often need to combine multiple detection methods to improve the accuracy of detection as much as possible.

Method used

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  • Method for using immediate information software by data detection network address switching equipment
  • Method for using immediate information software by data detection network address switching equipment
  • Method for using immediate information software by data detection network address switching equipment

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Experimental program
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Embodiment Construction

[0029] NAT detection using IM data can be roughly divided into two steps:

[0030] 1) Filter out the data belonging to the IM maintenance session state channel (hereinafter referred to as the IM channel) from the data passing through the detection point;

[0031] 2) Analyze the current parallel IM channel data from the IM channel data, that is, the number of IM routines running on the detection object at this time, and then judge whether the detection object is NAT according to the number.

[0032] Filtering of IM channel data

[0033] Due to the different working methods of different existing IMs, the filtering details are also different, but they can be generally divided into two ways: using IM to filter with the characteristics of a server with a fixed address and port number; using some session-maintaining Data is filtered by the characteristics of specific data format and content. We choose two typical IMs, Google Talk and MSN Messenger, for illustration. The flow chart...

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Abstract

This invention can find out the concurrent routines number of immediate information software in the detected address by acquiring the data of immediate information software in the network, in order to judge whether NAT is operated in the IP address. It uses the current-unused information of application layer. Users and NAT manufacturers cannot avoid detection by modifying mainframe network protocol stack and NAT gateway.

Description

technical field [0001] The method for detecting network address conversion equipment using data of instant messaging software belongs to the technical field of the Internet, and in particular relates to the management technology of the Internet access network. Background technique [0002] The network address translation device (hereinafter referred to as NAT) is a solution proposed in 1994 to solve the shortage of IPv4 addresses. Typical working scenarios of NAT are as follows: figure 1 As shown, the subnet using private addresses accesses the Internet through NAT. NAT is configured with at least one globally valid address G, and hosts inside the subnet use private addresses. NAT translates the IP addresses in incoming and outgoing datagrams, replacing the source address in each outgoing datagram with a G, and replacing the destination address in each incoming datagram with the private address of the correct host. From the outside, NAT is similar to a normal host, all da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/00H04L12/56H04L47/76
Inventor 毕军章淼吴建平赵雷
Owner TSINGHUA UNIV
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