From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [patch 1/2] ip_gre: Rebinding of GRE tunnels to other
 interfaces
Date: Thu, 13 Dec 2007 09:47:18 -0800 (PST)
Message-ID: <20071213.094718.97123365.davem@davemloft.net>
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To: mschmidt@redhat.com
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From: mschmidt@redhat.com
Date: Thu, 13 Dec 2007 14:37:49 +0100

> This is similar to the change already done for IPIP tunnels.
> 
> Once created, a GRE tunnel can't be bound to another device.
> To reproduce:
> 
> # create a tunnel:
> ip tunnel add tunneltest0 mode gre remote 10.0.0.1 dev eth0
> # try to change the bounding device from eth0 to eth1:
> ip tunnel change tunneltest0 dev eth1
> # show the result:
> ip tunnel show tunneltest0
> 
> tunneltest0: gre/ip  remote 10.0.0.1  local any  dev eth0  ttl inherit
> 
> Notice the bound device has not changed from eth0 to eth1.
> 
> This patch fixes it. When changing the binding, it also recalculates the
> MTU according to the new bound device's MTU.
> 
> Signed-off-by: Michal Schmidt <mschmidt@redhat.com>

Applied to net-2.6.25, thanks.