netdev - Re: [PATCH] ipv6: addrconf: clear IPv6 addresses and routes when losing link

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Message-ID: <AANLkTin-u_bZj6_wpoV6fNaLg81JbFN0EvhNrA6wX6SG@mail.gmail.com>
Date:	Tue, 26 Oct 2010 10:13:45 -0700
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	brian.haley@...com, shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: addrconf: clear IPv6 addresses and routes when
 losing link

On Tue, Oct 26, 2010 at 10:10 AM, David Miller <davem@...emloft.net> wrote:
> It would be fundamentally flawed, in my opinion, if the normal
> mechanisms of ipv6 cannot handle this situation adequately.

I think they can. When you associate with a new link, you naturally
set up link-local addresses, perform DAD for them, and send router
solicitations. You just need to make sure you don't have old addresses
from a previous link you were on before.

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.
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