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What does PF mean?
- PF is a BSD licensed stateful packet filter, a central piece of software for firewalling. It is comparable to iptables, ipfw and ipfilter. PF is developed on OpenBSD, but has been ported to many other operating systems including FreeBSD, NetBSD, DragonFly BSD, Debian GNU/kFreeBSD, and Mac OS X 10.7 "Lion" and later.