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Method and device for tracing source of internet protocol (IP) address after network address translation (NAT)

A technology of IP address and source port, applied in the network field, can solve the problems of high system overhead, consumption of large storage resources, consumption of CPU resources, etc., and achieve the effect of saving system overhead

Active Publication Date: 2012-11-07
SANGFOR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the method of regularly analyzing NAT logs in the traditional technology needs to store the NAT logs, which will consume a large amount of storage resources, and querying a large number of NAT logs will also consume CPU resources. Therefore, the IP address traceability method after NAT in the traditional technology has high system overhead

Method used

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  • Method and device for tracing source of internet protocol (IP) address after network address translation (NAT)
  • Method and device for tracing source of internet protocol (IP) address after network address translation (NAT)
  • Method and device for tracing source of internet protocol (IP) address after network address translation (NAT)

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Embodiment Construction

[0036] In one embodiment, such as figure 1 As shown, a method for traceability of IP addresses behind NAT includes:

[0037] Step S102, obtain the data packet, and extract the docking IP and docking port of the data packet after NAT conversion.

[0038] The data packet is a data packet after NAT conversion, and usually the NAT conversion process can occur in the router at the interface between the internal network and the external Internet. Before the data packet is converted by NAT, the header part contains the source IP address of the terminal sending the data packet and the source port of the router receiving the data packet. After the router performs NAT conversion on the data packet, it forwards the data packet to the external network address. At this time, the header part of the data packet includes the docking IP and docking port after NAT conversion, that is, the external network IP and port of the router (NAT conversion device).

[0039] Step S104, look up the mapp...

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Abstract

The invention relates to a method and a device for tracing a source of an internet protocol (IP) address after network address translation (NAT). The method includes: obtaining a data packet and extracting a connecting IP and a connecting port of the data packet after the NAT; finding mapping record corresponding to the connecting IP and the connecting port in a preset NAT mapping table; and obtaining a source IP address of the data packet according to the mapping record. In addition, the device for tracing the source of the IP address after the NAT is included. By means of the method and the device for tracing the source of the IP address after the NAT, system expenditure can be reduced.

Description

technical field [0001] The invention relates to the field of network technology, in particular to a method and device for tracing the source of an IP address after NAT. Background technique [0002] NAT (Network Address Translation) is the process of converting the source IP address and source port in the IP packet header into different docking IP addresses and docking ports. In practical applications, NAT is mainly used to enable private networks to access public networks. NAT devices are usually set at the interface between the internal network of an enterprise or organization and the external Internet, thereby saving IP resources. [0003] With the improvement of network security awareness, enterprises or organizations have more and more requirements for the supervision of internal network users to send information through the Internet. To meet the relevant requirements of the organization for network behavior records and avoid possible regulatory risks, it is necessary...

Claims

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Application Information

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IPC IPC(8): H04L29/12
Inventor 张兴彦李海柳
Owner SANGFOR TECH INC
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