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PF (Packet Filter) is a network filtering tool central to OpenBSD and FreeBSD systems. The fourth edition covers IPv6, dual stack configurations, traffic shaping with queues and priorities, NAT and redirection, wireless networking, spam filtering, and failover provisioning. Topics include creating rulesets for various network topologies, securing wireless networks with authpf, maximizing availability with CARP and relayd, building adaptive firewalls, implementing traffic shaping with ALTQ and Dummynet, and monitoring traffic with NetFlow. The book covers OpenBSD 7.x, FreeBSD 14.x, and NetBSD 10.x.

The Book of PF, 4th Edition