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They might've been trying freebsd back when pf wasn't well supported. Back when I last used openbsd (which might be nearly 20yrs ago now - eek), pf support on freebsd was lagging quite a bit.

Not sure what things are like now though - I'm guessing it's much better as pf was obviously the best option :)

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My impression:

* PF was imported into FreeBSD from OpenBSD, maybe it had problems at first.

* Both implementations have been actively maintained, further developed, and diverged.

* There is now collaboration in the development of the FreeBSD and OpenBSD implementations.

* PF is the shit. Even though IPFW is the "invented here" firewall.

Yep, started on PF and the Palo and NSX FWs I use at the day job are a piece of cake.

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