Content filtering gateway realizing method based on network filter

A network filter and content filtering technology, applied in the field of communication, can solve the problems of spam threat, negative impact on teenagers, large network performance, etc., to achieve the effect of easy maintenance, reducing data copying and space switching

Inactive Publication Date: 2007-11-07
BEIJING UNIV OF TECH
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Problems solved by technology

There are various kinds of information on the Internet, most of which have not been strictly checked and screened. Although they can meet the needs of some education, information and leisure, there are also a large number of obscene, pornographic, Violent terror, anti-government and racial discrimination websites
[0004] The seco

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  • Content filtering gateway realizing method based on network filter
  • Content filtering gateway realizing method based on network filter
  • Content filtering gateway realizing method based on network filter

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0047] The present invention relates to a content filtering gateway based on a network filter framework, aiming at realizing real-time content filtering at the network border and filtering application layer information at the network layer. The core of the present invention is as shown in Fig. 1, and said gateway (2) installs dual network cards, two network cards are all set to promiscuous mode, use brctl configuration two network cards to be network bridge. One network card of the gateway is connected to the router (1), which is the only exit from the network to the Internet; the other network card is connected to the switch (3), so that the system can be filtered through the network in a transparent manner. In this way, the network structure and devices on the network can be connected to the network without any modification; when the content filtering syste...

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Abstract

A method for realizing content filtering gateway based on network filter includes realizing network content analysis and real time monitor as well as realizing purpose of filtering application layer information at network layer based on Linux system platform, utilizing network filter Net-filter frame to carry out collection and filtering on data packet under kernel state for optimizing network path of data packet and for raising collection efficiency of data, furthermore using shared internal memory technique of user space and kernel space to submit session content from kernel state to content filtering module of user state.

Description

technical field [0001] The invention belongs to the technical field of communication, and specifically designs collection and filtering of data packets in a kernel state, session restoration, communication between a user state and a kernel state, realization of a transparent mode, and the like. Filtering can be performed based on the complete content of the session to prevent illegal data packets from passing. Background technique [0002] The Internet satisfies the supreme realm of "fast" and "unrestricted" that people have been pursuing for thousands of years, breaks through time and space, and realizes people's dream of freedom. It fits the original nature of people, and the degree of "freedom" achieved exceeds people's imagination. The openness of the Internet has allowed people to enjoy the freedom of unfettered access to various information, release of speech, but at the same time, it has also brought many information security problems. [0003] Statistics show that ...

Claims

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Application Information

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IPC IPC(8): H04L12/66H04L12/56H04L49/9015
Inventor 张建标孙鸿斌艾蓉张正国
Owner BEIJING UNIV OF TECH
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