From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] ipv6: fix incorrect unregistration of sysctl when last
 ip deleted
Date: Fri, 29 Apr 2011 20:47:14 -0700 (PDT)
Message-ID: <20110429.204714.193727944.davem@davemloft.net>
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Cc: kuznet@ms2.inr.ac.ru, pekkas@netcore.fi, jmorris@namei.org,
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From: John Gardiner Myers <jgmyers@proofpoint.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