From owner-freebsd-pf@FreeBSD.ORG  Tue Aug 14 22:14:47 2007
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From: Toomas Pelberg <toomas@detalem.cq.hk>
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Date: Wed, 15 Aug 2007 00:46:48 +0300
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Subject: pfctl -i
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pfctl man page says:

-i interface
             Restrict the operation to the given interface.

..what exactly is meant under the word "operation" ?

My problem: I want to load a different ruleset for each interface
( jails ) and not care about what's in the ruleset as long as it doesn't
affect anything outside the jail ( which is bound to a specific ip on a
seperate interface )

I tried loading pfctl -i lo1 -f test.fire which contained "block quick
all" ..which promptly killed everything :/

And no, it's not about using the loopback interface.. same goes for
"real" interfaces like nve & fxp. Neither does it restrict you from
loading "block quick on another_iterface all" and still killing
everything..

OpenBSD seems to act the same, so it's probably not an porting bug.