From owner-freebsd-pf@FreeBSD.ORG  Sat Jul  3 13:42:15 2010
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Date: Sat, 3 Jul 2010 15:29:33 +0200
From: Reinhard Haller <reinhard.haller@interactive-net.de>
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Subject: urpf-failed & ipv6
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Hi,

I recently discovered a strange behavior on my border router.
In the following ruleset:

block log all
block in log quick from urpf-failed to any
pass quick on $int_if inet6 proto udp from any to any port ripng
block drop on !$int_if inet6 proto udp from any to any port ripng

all occurrences of

fe80::<mac-address>%$int_if -> ff02::9

were blocked by the urpf-failed rule.

Any suggestuions why this happens?

Thanks Reinhard