netdev - Re: [PATCH 1/2] IPV6: remove addresses and routes when carrier is lost

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Date:	Wed, 04 Jun 2008 01:17:17 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	shemminger@...tta.com
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH 1/2] IPV6: remove addresses and routes when carrier is
 lost

In article <20080602165347.5662f602@...reme> (at Mon, 2 Jun 2008 16:53:47 -0700), Stephen Hemminger <shemminger@...tta.com> says:

> Similar to previous change for IPV4. Allow configuration option to remove
> addresses from FIB when carrier is lost.
> 
> This patch also makes IPV6 ignore changes to carrier state when device
> is admin down state. This prevents address configuration from starting
> up on a buggy device driver that signals carrier changes when offline.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

Well, we need to be careful here.
IMHO we should not remove addresses (especially link-local address
based on MAC, or manually assigned addresses, maybe).
We might want to do Optimistic DAD here.

--yoshfuji
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