ipfirewall,簡稱ipfw,在FreeBSD上開發的IP封包過濾程式,具備防火牆功能,由FreeBSD開發團隊負責維護。它曾被移植到多個平台上,Mac OS X曾經採用它作為預設防火牆,直到Mac OS X 10.7 Lion 採用另一個FreeBSD程式PF來取代它。在1994年,艾倫·考克斯曾經將它移植到Linux 1.1上,作為Linux的預設防火牆,直到Linux 2.2採用ipchains來取代。

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

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