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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] ipv6: addrconf: clear IPv6 addresses and routes when
 losing link
Date: Tue, 26 Oct 2010 10:21:45 -0700 (PDT)
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From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 26 Oct 2010 10:13:45 -0700

> Removing autoconfigured addresses is what the kernel currently does
> when the link goes down. The patch just makes sure it happens when
> carrier is lost as well, since losing link might mean that when
> carrier comes back, the host might be on a different link than it was
> before.

I just think validating that fact would be a better approach than
simply assuming link down/up means link change.