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Subject: [Bug 207598] pf adds icmp unreach on gre/ipsec somehow
Date: Fri, 10 Jun 2016 18:57:06 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207598

--- Comment #34 from Max <maximos@als.nnov.ru> ---
(In reply to Kristof Provost from comment #33)
Yeah, that's my fault... It is ICMP. But man pf.conf says
return
                 This causes a TCP RST to be returned for tcp(4) packets and
                 an ICMP UNREACHABLE for UDP and other packets.


(In reply to Kristof Provost from comment #32)
I'm trying to understand what's happening... Without the patch:

ruleset 1:
scrub on gre1
pass log (all) all
block return out log (all) on gre1 proto icmp

ICMP-unreach exists.

ruleset 2:
scrub on gre1
pass log (all) all
block return in log (all) on gre0 proto icmp

ICMP-unreach doesn't exist. Should it?

ruleset 3:
scrub on gre0
scrub on gre1
pass log (all) all
block return in log (all) on gre0 proto icmp

ICMP-unreach doesn't exist.

I've rebuilt the kernel... again... the patched version.
There is no ICMP-unreach at all. So, the first case is relevant to patch, I
think...

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