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TCP/IP 包过滤工具，能阻止某个ip，还可以用来端口映射
This is a TCP/IP packet filter for Windows NT4, Windows 2000, Windows XP and Windows 2003, the filter can block IP packet based on a set of pre-defined rules, the rules can also be modified dynamically. The filter also can map the TCP/UDP traffic from one port to other port.
