分析了数据包调用检测函数匹配规则节点的平均次数计算函数，并用该函数对Snort系统规则树进行了优化，减少了数据包过滤匹配次数，极大提高了入侵检测效率-Analysis of packet matching rules called detection function of the average number of nodes the calculation function, and the system function of the Snort rules tree is optimiz

通过介绍常用的入侵检测工具snort的配置，基本应用和规则编写，实现简易的入侵检测功能，便于理解入侵检测的基本原理-Introduce the common snort intrusion detection tool configuration, the basic application and rules written in simple intrusion detection features, easy to understand the basic principles of in