netdev - Re: fe80::/64 route missing on GRE tunnels

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Message-ID: <20140217130454.GB22833@order.stressinduktion.org>
Date:	Mon, 17 Feb 2014 14:04:54 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	netdev@...r.kernel.org, itk-intern@...fundet.no, sesse@...fundet.no
Subject: Re: fe80::/64 route missing on GRE tunnels

On Mon, Feb 17, 2014 at 11:34:07AM +0100, Nicolas Dichtel wrote:
> Le 17/02/2014 11:17, Steinar H. Gunderson a écrit :
> >On Mon, Feb 17, 2014 at 10:59:38AM +0100, Nicolas Dichtel wrote:
> >>>It is added (ip -6 addr add fe80::1 dev foo), but it doesn't help 
> >>>without the
> >>>/64 being present.
> >>With 'ip -6 addr add fe80::1/64 dev foo', the link local route will be 
> >>added.
> >
> >Possible, but you're still breaking userspace. You could argue the tunnel
> >setup system in question should have added a /64 in the first place, but it
> >is deployed at a number of locations and changing all of them is not 
> >trivial.
> I will propose a patch (instead of reverting the original one).

Thanks for looking into this, Nicolas. I agree it is not a very nice
situation.

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