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

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Message-ID: <20080603102144.571df55b@extreme>
Date:	Tue, 3 Jun 2008 10:21:44 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
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

On Wed, 04 Jun 2008 01:17:17 +0900 (JST)
YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@...ux-ipv6.org> wrote:

> 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

The patch just makes carrier_off respond the same as doing 'ip link set dev eth0 down'
(or ifconfig eth0 down). A router needs to be able to re-route when link fails.
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