netdev - Re: [PATCH] ipv6: do not add link-local address if one already exists

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Date:	Sun, 10 Aug 2014 22:37:12 +0200
From:	Hannes Frederic Sowa <hannes@...hat.com>
To:	Roy Marples <roy@...ples.name>
Cc:	netdev@...r.kernel.org,
	"David S. Miller\" <davem@...emloft.net>, Alexey Kuznetsov "
	 "<kuznet@....inr.ac.ru>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, "
	 Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] ipv6: do not add link-local address if one already
 exists

Hi,

On So, 2014-08-10 at 19:56 +0000, Roy Marples wrote:
> Currently the kernel will always add an IPv6 link-local address
> based on the hardware address when the interface is brought up.
> This is probably based on the assumption that userland would
> never add one before the interface is brought up.
> 
> However, one at least one userland application (dhcpcd) does this so
> it can implement RFC7217 which can be used for link-local addresses
> as well.
> 
> Attached is a patch which checks to see if a link-local address exists
> before indiscriminately adding one.

Please have a look at:
https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=bc91b0f07ada5535427373a4e2050877bcc12218

This was recently implemented just for this specific case.

Bye,
Hannes


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