linux-kernel - Re: [PATCH] ipv6: fix incorrect unregistration of sysctl when last ip deleted

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Date:	Fri, 29 Apr 2011 20:47:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jgmyers@...ofpoint.com
Cc:	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv6: fix incorrect unregistration of sysctl when last
 ip deleted

From: John Gardiner Myers <jgmyers@...ofpoint.com>
Date: Fri, 29 Apr 2011 14:58:24 -0700

> The "how" parameter indicates the device is being deleted. In this
> case, the device is not being deleted.

It means that ipv6 is being disabled on the device.

Which is what happens when one of the following happens:

1) the MTU is too small to support ipv6 properly

2) no configured ipv6 addresses remain on the device

3) the device is being unregistered
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