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Study on correctness of firewall′s packet filtering rule

WANG Xiaowei1,LI Feng\+2(1College of Information Technology,Shenyang Normal University,Shenyang 110034,China;2Expressway Administration Bureau,Shengyang 110031,China)  
With quick development of network technology,it is necessary for us to learn and work in web application and share network resources.As long as there is network,safety problem will become very important.Now,there are all kinds of safety tools on market,but the firewall is the mature technology and is the earliest product.The firewall is a technique of strategy safety.Packet filtering system of the firewalls is the most basic,the most important,and the most core part.The packet filter rule of the firewalls is based on actual safe policy,and should think over the whole validation and criterion about rule aggregate,but not centralize in every rule of rule aggregate.This paper study the correctness of packet filtering rules,and check conflict before rules were applied,avoiding contradiction and redundancy between rules,so it is convenient to manage rules,maintain rules,and will make safe policy better.
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