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Date: Thu, 23 Jan 2003 12:41:53 -0700
From: "Kevin P. Fleming" <kpfleming@cox.net>
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To: Chris Friesen <cfriesen@nortelnetworks.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: is it possible to bridge virtual devices (ie. a GRE tunnel)?
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Chris Friesen wrote:
> 
> I want to set up two physically separate LANs with the same network 
> address and logically bridge them using some kind of tunnel over an IP 
> network.
> 
> I was hoping to somehow combine bridging with GRE tunnels in the kernel 
> to accomplish this, but I haven't been able to find out for sure if the 
> current kernel bridging code can handle a tunnel device as one of the 
> bridge elements.
> 
> Can anyone give the definitive answer for this?
> 
> Thanks,
> 
> Chris
> 

I don't believe you'd be able to use GRE tunnels, as they are not an "Ethernet" 
type of tunnel.

However, I run a network with three physical locations, bridged over TAP-type 
tunnels using VTUN (vtun.sourceforge.net). These are Ethernet-type tunnel 
devices, so the bridge code just sees them as if it was any other Ethernet 
network interface.

In addition, I use ebtables to control what traffic gets bridged across the 
tunnels, so extraneous broadcast/multicast traffic stays where it is supposed to.

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