From owner-freebsd-net@FreeBSD.ORG  Wed Feb  8 21:53:12 2012
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Date: Wed, 8 Feb 2012 23:53:07 +0200
From: =?windows-1251?B?yu7t/Oru4iDF4uPl7ejp?= <kes-kes@yandex.ru>
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Subject: security issue!!
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some host on LAN can send packets to MAC address of FreeBSD server

and server accept packets even if frame is not in its subnet and pass them further %-)

details here
http://www.freebsd.org/cgi/query-pr.cgi?pr=164914