摘要： 防火墙技术是保护网络安全的一种重要手段，代理服务器是防火墙的关键技术之一，其效率与其安全防护能力同样不容忽视，文中叙述了一种高效防火墙系统的实现原理。

关键词: 网络安全, 防火墙, 代理服务器, 网络地址转换

Abstract: Firewall is a very important technique to protect the network. The proxy server is one of keys of firewall. Its efficiency is as in'portallt as its ability to protect the network. Here introduced is the principle of a firewall system with high efficiency.

中图分类号: 

• TP393.08