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Date:	Wed, 21 May 2014 10:35:17 -0700
From:	Cong Wang <>
To:	Milos Vyletel <>
Cc:	"David S. Miller" <>,
	Alexey Kuznetsov <>,
	James Morris <>,
	Hideaki YOSHIFUJI <>,
	Patrick McHardy <>,
	"open list:NETWORKING [IPv4/..." <>,
	open list <>
Subject: Re: [patch net-next] net: ipv6: trigger action when setting conf.all sysctls

On Mon, May 19, 2014 at 10:09 AM, Milos Vyletel <> wrote:
> As it is right now most of these tunables don't do anything - they don't
> set any interface specific settings to the desired value and they don't
> take precedence before device specific settings in most cases.
> Documentation/networking/ip-sysctl.txt defines them to be:
> conf/all/*:
>         Change all the interface-specific settings.
> but that is not really the case.

I don't think it's a good idea, it enforces interface specific changes.

You need to mimic what IPv4 conf does (if it hasn't done yet), something
like below:

#define IN_DEV_MAXCONF(in_dev, attr) \
        (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
             IN_DEV_CONF_GET((in_dev), attr)))
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