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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Re: [PATCH] networking using libpcap
Date: Sun, 27 Jul 2008 13:55:15 +0100
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Cc: Jung-uk Kim <jkim@freebsd.org>, Juergen Lock <nox@jelal.kn-bremen.de>, Sebastian Herbszt <herbszt@gmx.de>

> 2) When using ifname=eth0, traffic doesn't work from host=>guest nor
> from guest=>host.  This seems like a major short-coming to me.

IIRC this is a known limitation of some common libcap implementations (in 
particular Linux).

Paul