OpenBSD PF
OpenBSD Packet Filter is a firewall tool for OpenBSD. It supports stateful packet filtering, Network Address Translation (NAT), port forwarding, passive operating system fingerprinting, packet queueing and Quality of Service, load balancing, and redundant firewalls. PF is known to be a proven, high-performance, and innovative packet filtering system. The PF sub-systems and related interfaces have been ported to the NetBSD, FreeBSD and DragonFly operating systems.



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