netdev - Re: [PATCH net-next v7] net: ipv6: Make address flushing on ifdown optional

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Message-Id: <20160225.214537.1334107695744344694.davem@davemloft.net>
Date:	Thu, 25 Feb 2016 21:45:37 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	dsa@...ulusnetworks.com
Cc:	netdev@...r.kernel.org, hideaki.yoshifuji@...aclelinux.com,
	hannes@...essinduktion.org
Subject: Re: [PATCH net-next v7] net: ipv6: Make address flushing on ifdown
 optional

From: David Ahern <dsa@...ulusnetworks.com>
Date: Wed, 24 Feb 2016 09:25:37 -0800

> Currently, all ipv6 addresses are flushed when the interface is configured
> down, including global, static addresses:
 ...
> Add a new sysctl to make this behavior optional. The new setting defaults to
> flush all addresses to maintain backwards compatibility. When the set global
> addresses with no expire times are not flushed on an admin down. The sysctl
> is per-interface or system-wide for all interfaces
> 
>     $ sysctl -w net.ipv6.conf.eth1.keep_addr_on_down=1
> or
>     $ sysctl -w net.ipv6.conf.all.keep_addr_on_down=1
> 
> Will keep addresses on eth1 on an admin down.
 ...
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>

Applied, thanks for your persistence David :)