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

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Message-ID: <20131126192600.GB20630@order.stressinduktion.org>
Date:	Tue, 26 Nov 2013 20:26:00 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Florent Fourcot <florent.fourcot@...t-bretagne.fr>
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)

On Tue, Nov 26, 2013 at 06:58:19PM +0100, Florent Fourcot wrote:
> >> 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...).

Yeah, I thought about that, too. But as new kernels would ship with a default
policy of prefer those temporary addresses I thought it would be ok.

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