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PF (firewall)
open-in-new
<p>PF (Packet Filter, also written pf) is a <a href="/facts/BSD_license/XLtmLp5x">BSD licensed</a> <a href="/facts/Stateful_firewall/eCIseahN">stateful</a> <a href="/facts/Packet_filter/Et2RkJaU">packet filter</a>, a central piece of software for <a href="/facts/Firewall_(computing)/Et2RkJaU">firewalling</a>. It is comparable to <a href="/facts/Netfilter/M3rtyl3r">netfilter</a> (<a href="/facts/Iptables/MHGwCkwR">iptables</a>), <a href="/facts/Ipfirewall/dB0nV6we">ipfw</a>, and <a href="/facts/Ipfilter/oCh1c89B">ipfilter</a>. </p><p>PF was developed for <a href="/facts/OpenBSD/xmPS9tek">OpenBSD</a>, but has been ported to many other <a href="/facts/Operating_systems/8XTuvMh2">operating systems</a>. </p>