Analyse the existing packet filter technology; realize a filter method.
分析现有的过滤技术，实现了一种过滤方法。
This paper analyzes FTP (File Transfer Protocol) firstly, and then introduces packet filter technology and proxy technology for FTP.
对文件传输协议进行了分析，在此基础上介绍了针对FTP服务的包过滤技术和代理技术。
The researching key point in the paper is the design and realization of the packet filter technology in individual security defense system.
本文研究的重点是个人安全防御系统中包过滤技术的设计与实现。
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