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Date:	Mon, 11 Aug 2014 00:05:13 +0000
From:	Roy Marples <>
To:	Hannes Frederic Sowa <>
	"\"David S. Miller\\" <>,
	Alexey Kuznetsov "\"\"" <>,
	Hideaki YOSHIFUJI <>,
	" <>"
Subject: Re: [PATCH] ipv6: do not add link-local address if one already exists


On 2014-08-10 20:37, Hannes Frederic Sowa wrote:
> 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:
> This was recently implemented just for this specific case.

Is that tunable available in /proc or /sys?
I'm not overly keen on adding a netlink call just for that in dhcpcd, it 
would be a lot of bloat compared to the kernel patch.

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