netdev - Re: [PATCH] ipv6: make the net.ipv6.conf.all.use_tempaddr sysctl propagate to interface settings

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Message-Id: <20111219.161624.488823593081231376.davem@davemloft.net>
Date:	Mon, 19 Dec 2011 16:16:24 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mathieu.trudel-lapierre@...onical.com
Cc:	netdev@...r.kernel.org, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] ipv6: make the net.ipv6.conf.all.use_tempaddr sysctl
 propagate to interface settings

From: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@...onical.com>
Date: Fri, 16 Dec 2011 16:45:33 -0500

> The description for IPV6_PRIVACY mentions using .../all/use_tempaddr to enable
> IPv6 Privacy Extensions, and IP sysctl documentation mentions 'all' as setting
> all interface-specific settings. We make sure at least use_tempaddr actually
> works as documented.
> 
> Signed-off-by: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@...onical.com>

"all" settings must be in place before the device is created and comes up.

You can't just "propagate" to the existing devices when the "all"
setting is changed, because an individual device might have had it's
independent sysctl setting modified by the administrator and you'll be
smashing that.

I'm not applying this patch.
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