在对传统的深度包过滤算法研究的基础上，提出了一种新的基于标示预处理的模式匹配算法，并予以实现。

On the base of the studies of traditional In-depth packet filter algorithms, a new algorithm of Pattern matching based on the pre-processed mark is put forward and realized.

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本文介绍了NDIS驱动程序结构，给出NDIS中间驱动程序实现网络数据包的拦截方法；并实现了一个基于规则的过滤算法，在过滤算法中引入了一个分层框架。

Network data packets are captured by NDIS Intermediate driver; A rule-based filtering algorithm is presented in this paper, and a layered filtering framework is included in the algorithm.

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此外，本文还分析了数据包过滤技术的另一个问题：规则冲突，给出了一个规则冲突的理论分析和查找算法。

In addition, the paper has analyzed another problem in the data packet filter technical: rule conflict, and has produced the rule conflict theory research and the searching algorithm.

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此外，本文还分析了数据包过滤技术的另一个问题：规则冲突，给出了一个规则冲突的理论分析和查找算法。

In addition, the paper has analyzed another problem in the data packet filter technical: rule conflict, and has produced the rule conflict theory research and the searching algorithm.

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