ABOUT PF PACKET FILTER - ANTIVIRUS Basic Definition PF (Packet Filter) is the packet filter or firewall configuration based on dynamic (stateful rules) written by Darren OpenBSD. Replaced the filter in Darren Reed IPFilter OpenBSD due to problems with the license, namely that Reed had to give permission to the OpenBSD developers to change the code. Theo de Raadt said IPFilter was removed when "the software that OpenBSD uses and shares should be free for all (both users and companies) For any purpose you want to be given, including modification, use, peeing on it or even join babies in crushing machines or atomic bombs to throw in Australia ". Due to the discomfort of the OpenBSD team with Reed's license, it was decided to replace the entire package rather than waste time trying to negotiate the issue. The PF has since developed very quickly And in OpenBSD 3.8 and had great advantage over other firewall options. Filtering syntax is similar t...