描述了网络安全与防火墙的基本原理和构造，对TCP/IP、网关的描述与*、病毒等相关网络知识的深入-Describes the network firewall security and the basic principles and structure of the TCP/IP, Gateway and a descr iption of the Trojan, virus and other related in-depth knowledge network

VC++6.0实现的利用IP过滤钩子驱动创建的一个Windows防火工具，支持TCP,UDP,ICMP协议,基本呈现了Windows防火墙开发的过程-VC++6.0 to achieve the use of IP filter hook driver to create a Windows fire prevention tools, support for TCP, UDP, ICMP protocol, the basic Windows firewall shows the proces