ipfirewall,简称ipfw,在FreeBSD上开发的IP封包过滤程式,具备防火墙功能,由FreeBSD开发团队负责维护。它曾被移植到多个平台上,Mac OS X曾经采用它作为预设防火墙,直到Mac OS X 10.7 Lion 采用另一个FreeBSD程式PF来取代它。在1994年,艾伦·考克斯曾经将它移植到Linux 1.1上,作为Linux的预设防火墙,直到Linux 2.2采用ipchains来取代。

FreeBSD "/etc/rc.firewall" shell script for configuring ipfw

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