利用系统驱动服务ipFltDrv.sys写的过滤驱动，仅支持TCP\UDP\ICMP协议的拦截、过滤-This is a filter driver written by using the system driver ipFltDrv.sys, a filter driver. Supported the TCP\UDP\ICMP protocol only.

这是一个基于VC++6.0的简易防火墙，使用MFC编程，基于Windows的ipfltdrv.sys驱动(This is a simple firewall based on VC++ 6.0. It uses MFC programming and Windows-based ipfltdrv.sys driver.)