netdev - Re: [PATCH 1/2] bridge: leave carrier on for empty bridge

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Message-ID: <20110902151100.327af0bf@nehalam.ftrdhcpuser.net>
Date:	Fri, 2 Sep 2011 15:11:00 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] bridge: leave carrier on for empty bridge

On Fri, 02 Sep 2011 23:39:03 +0200
Nicolas de Pesloüan <nicolas.2p.debian@...il.com> wrote:

> Le 02/09/2011 19:22, Stephen Hemminger a écrit :
> > This resolves a regression seen by some users of bridging.
> > Some users use the bridge like a dummy device.
> > They expect to be able to put an IPv6 address on the device
> > with no ports attached during boot.
> >
> > Note: the bridge still will reflect the state of ports in the
> > bridge if there are any added.
> 
> Doesn't this jeopardize the behavior introduced in 1faa4356a3bd89ea11fb92752d897cff3a20ec0e
> "bridge: control carrier based on ports online"?
> 
> If the user starts the DHCP client before adding the first port to the bridge, the DHCP client will 
> have a carrier and start the autoconfiguration process. This was the old behavior, but you fixed it.
> 
> 	Nicolas.
> 

There is no perfect solution.
If DHCP works then IPv6 breaks?
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