History
PF was written by Daniel Hartmeier. It appeared in OpenBSD 3.0, which was released on 1 December 2001.
PF was originally designed as replacement for Darren Reed's IPFilter, from which it derives much of its rule syntax. IPFilter was removed from OpenBSD's CVS tree on 30 May 2001 due to OpenBSD developers' concerns with its license.
Read more about this topic: PF (firewall)
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