netdev - Re: [PATCH] ipv6 addrconf: source address selection, Rule 7: Prefer temporary addresses (RFC 6724)

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Message-ID: <5294E13B.8010108@enst-bretagne.fr>
Date:	Tue, 26 Nov 2013 18:58:19 +0100
From:	Florent Fourcot <florent.fourcot@...t-bretagne.fr>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
CC:	fx.lebail@...oo.com, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, dcbw@...hat.com,
	jiri@...nulli.us
Subject: Re: [PATCH] ipv6 addrconf: source address selection, Rule 7: Prefer
 temporary addresses (RFC 6724)

>> The RFC 6724 change the default recommendation for source address selection
>> Rule 7 to prefer temporary addresses rather than public addresses,
>> while providing an administrative override.
>>
>> The administrative override is based on the prefer_src_public sysctl.
> 
> I like the idea and it could be useful in addition to the new
> IFA_F_MANAGETEMPADDR flag which should show up any time soon.
> 

I like the principle of the idea too, but is it acceptable to break the
user space compatibility?
If the patch is accepted, someone with the value "1" in use_tempaddr
will have a big surprise with a newer kernel  (I do not see any use case
to set this option to 1, but maybe...).

Regards,

Florent.
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