netdev - Re: [net-next 1/2] ip6_tunnel: put ip6tnl0 FB device into 'any' mode

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Message-Id: <20141022.124759.127380581033792550.davem@davemloft.net>
Date:	Wed, 22 Oct 2014 12:47:59 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	alan@...an.info
Cc:	netdev@...r.kernel.org, edumazet@...gle.com
Subject: Re: [net-next 1/2] ip6_tunnel: put ip6tnl0 FB device into 'any'
 mode

From: "Alexey Andriyanov" <alan@...an.info>
Date: Tue, 21 Oct 2014 12:11:27 +0400

> The fallback device is in ipv6 mode by default.
> The mode can not be changed in runtime, so there
> is no way to decapsulate ip4in6 packets coming from
> various sources without creating the specific tunnel
> ifaces for each peer.
> 
> Cc: David Miller <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Alexey Andriyanov <alan@...an.info>

I don't think you can legitimately change this after all
these years.  You'll break someone's setup somehow.

You're going to have to find a way to achieve what you
want whilst keeping the default unchanged.

Sorry.
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