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Date:      Thu, 31 Jul 2014 02:06:55 +0200
From:      Sydney Meyer <syd.meyer@gmail.com>
To:        freebsd-pf@freebsd.org
Subject:   NAT IPSec Traffic with pf
Message-ID:  <9B8D62A1-8377-4D27-8E1B-816E16C96E5F@gmail.com>

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Got a reply in the forums from "junovitch":

"There is a bug in 10.0-RELEASE with how how the kernel is tagging the =
mbuf allocated with IPSEC packets as it gets tagged to skip firewalling. =
Hence PF can't NAT what it can't see. Short answer is you need to =
upgrade to 10.0-STABLE or use an older version of FreeBSD.

Long answers:
http://www.freebsd.org/cgi/query-pr.cgi?pr=3D185876 - The PR with the =
technical details.
https://forums.freebsd.org/viewtopic.php?f=3D7&t=3D45691 - Same issue =
and the troubleshooting that helped find it."

Upgrading to 10 STABLE fixed the issue.

Cheers,
S.=



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