From owner-freebsd-ipfw@FreeBSD.ORG  Wed Apr  7 20:16:44 2010
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Date: Wed, 07 Apr 2010 21:58:38 +0200
From: Anders Hagman <anders.hagman@halleforshunden.org>
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Subject: dummynet and vnet kernel panic
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Hi

When using dummynet inside a vnet node with a simple pipe the kernel 
panic on the first packet.

I use 8.0-STABLE cvsuped at 7 Apr 15:28
The ipfw code with dummynet is largely changed and the patch in the url 
below will not work.
http://www.freebsd.org/cgi/query-pr.cgi?pr=143621

Is there a fix in the near future?

BR
/Anders H