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Date: Wed, 31 Jan 2007 09:55:26 +0900
From: chris mcharg <chris@atmark-techno.com>
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Subject: Re: [Bridge] Multiple bridges in one box
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To: Leigh Sharpe <lsharpe@pacificwireless.com.au>
Cc: bridge <bridge@lists.osdl.org>

  > Hi,

Gidday

> 
> I'm looking at building a box like this and I'm wondering if it's doable.
[...]
> 
> Secondly can I bridge a tun device with a physical device, say tun0 and eth0
> bridged to form br0.
> 

I think this is pretty much standard practice when using openvpn.

http://openvpn.net/bridge.html

However, I think you might want to use a tap device as tun is IP level, 
according to this doc:

http://www.linux-m32r.org/lxr/http/source/Documentation/networking/tuntap.txt

Chris