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Dynamic packet filter utilizing session tracking

A filter and main filter technology, applied in the direction of instruments, electrical digital data processing, computer security devices, etc., can solve problems such as impractical applications

Inactive Publication Date: 2004-08-04
TELECOM ITALIA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

however, most firewalls today are implemented in software, requiring the computing resources of a full desktop computer, making their use in portable computing devices such as cell phones or PDAs impractical

Method used

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  • Dynamic packet filter utilizing session tracking
  • Dynamic packet filter utilizing session tracking
  • Dynamic packet filter utilizing session tracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Symbols used throughout

[0044] The following symbols are used throughout this document.

[0045] Definition of Terms

[0046] ADSL Asymmetric Digital Subscriber Line

[0047] ARP address resolution protocol

[0048] ASIC application specific integrated circuit

[0049] CPU central processing unit

[0050] DAT digital audio tape

[0051] DSL Digital Subscriber Line

[0052] DSP digital signal processor

[0053] DVD Digital Versatile Disc

[0054] EEPROM Electrically Erasable Programmable Read Only Memory

[0055] EEROM electrically erasable read-only memory

[0056] EPROM Erasable Programmable Read Only Memory

[0057] FPGA Field Programmable Gate Array

[0058] FTP file transfer protocol

[0059] HDSL High Bit Rate Digital Subscriber Line

[0060] HTML hypertext markup language

[0061] IAB Internet Architecture Board

[0062] ICMP Internet Control Message Protocol

[0063] IP Internet Protocol

[0064] ISP internet service provider

[0065] LAN lo...

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PUM

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Abstract

A novel and useful dynamic packet filter that can be incorporated in an hardware based firewall suitable for use in portable computing devices such as cellular telephones and wireless connected PDAs that are adapted to connect to the Internet. The invention performs dynamic packet filtering on packets received over an input packet stream. The dynamic filter cheeks dynamic protocol behaviour using information extracted from the received packet. Sessions are created and stored in a session database to track the state of communications between the source and destination. Recognition of a session is accelerated by use of a hash table to quickly determine the corresponding session record in the session database. Session related data is read from the session database and the received packet is checked against a set of rules for determination of whether to allow or deny the packet.

Description

technical field [0001] The present invention relates generally to data communication systems, and more particularly to a dynamic packet filter that uses session tracking to determine whether to allow or deny a packet. Background technique [0002] In recent years, the world has witnessed the explosive growth of the Internet. While the number of users seems to be growing endlessly, more hosts are added every year. The Internet enables communication using a variety of technologies, including remote computer login, file transfer, World Wide Web (WWW) browsing, electronic mail, and the like. In addition, different protocols have been designed and used on the Internet to handle different types of communications, such as File Transfer Protocol (FTP) for file transfers, Hypertext Markup Language (HTML) for World Wide Web services, etc. . Typically, the protocols involved in Internet communications are grouped under the umbrella of the Transmission Control Protocol / Internet Proto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/00G06F21/00G06F21/55H04L12/66H04L29/06
CPCH04L63/0254H04L69/00
Inventor 罗内·歌德伯格加蒂·丹内利莫什·泽扎克卓利·肖哈特
Owner TELECOM ITALIA SPA