PF (Packet Filter) is the filtering layer integrated with BSD UNIX legacy open source solutions (FreeBSD, NetBSD, OpenBSD, etc.). PF was created in 2001 by Daniel Hartmeier as a replacement for IPFilter.
This system has the advantage of using a simple configuration language and of integrating NAT and QoS functionalities. Packet Filter has become the most powerful open source tool to act as a firewall. It can also be used for load balancing and to handle network traffic on open source BSD UNIX machines.
PF is distributed under the BSD License.
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