From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Webb <chris@arachsys.com>
Subject: Re: Trouble understanding net config options
Date: Thu, 16 Jul 2009 00:24:14 +0100
Message-ID: <20090715232414.GO2003@arachsys.com>
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To: Michael Jinks <michael.jinks@gmail.com>
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Michael Jinks <michael.jinks@gmail.com> writes:

> How do I make a guest use a specific tap?  Quoting
> from my initial post, my -net options are:
> 
>  -net nic -net tap,name=tap11 -net nic -net tap,name=tap12

You want

  -net nic,vlan=0 -net tap,vlan=0,ifname=tap11 -net nic,vlan=1 -net tap,vlan=1,ifname=tap12

to get the effect that (I think) you're looking for: one nic connected to
tap11 using vlan0 and one nic connected to tap12 using vlan1.

Without the vlan parameters, everything's on vlan0 so you get two nics and
two tap interfaces all connected together inside qemu on a single virtual
switch.

Best wishes,

Chris.