From owner-freebsd-current@FreeBSD.ORG  Fri Jul 13 07:22:44 2007
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Date: Fri, 13 Jul 2007 09:22:42 +0200 (MEST)
From: Michiel Boland <michiel@boland.org>
To: freebsd-current@freebsd.org
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Subject: immediate reboot with ipnat/ipmon on amd64
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Hi. I wanted to try something out with nat. So I tried this with ipnat. 
But my -CURRENT amd64 box instantly reboots if I type

  # ipnat -l
  # ipmon -a

No crash dump, nothing. Just immediate reboot.

FWIW - ipfilter was built into the kernel (i.e. not a module)

Anyone else seeing this?