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The OpenBSD PF Packet Filter Book covers PF on the NetBSD, FreeBSD, DragonFly and OpenBSD platforms. It is an expanded and improved version of the PF FAQ with sections covering Spamd and configuring and using PF on NetBSD, FreeBSD, DragonFly and OpenBSD. The cross-referenced and indexed book also covers quality of service and ALTQ, load balancing, FTP proxying, stateful packet filtering, network address translation (NAT), port forwarding, passive operating system fingerprinting, and redundant firewalls (using pfsync and CARP). The OpenBSD PF Packet Filter Book includes several examples and rulesets.