netdev - Re: Bridge stays down until a port is added

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Message-ID: <20110925082504.GA32712@torres.zugschlus.de>
Date:	Sun, 25 Sep 2011 10:25:04 +0200
From:	Marc Haber <mh+netdev@...schlus.de>
To:	netdev@...r.kernel.org
Subject: Re: Bridge stays down until a port is added

On Tue, Sep 20, 2011 at 03:20:26PM -0500, Dan Williams wrote:
> On Sat, 2011-09-17 at 22:42 +0200, Marc Haber wrote:
> > On Thu, Aug 11, 2011 at 08:17:06AM -0700, Stephen Hemminger wrote:
> > In the IPv6 SLAAC case, the host tries start its radvd on the bridge
> > well before the first VM comes up, the radvd barfs since the interface
> > is not up, does not come up, and the VMs are without network. In this
> > case, it is needed to force the bridge into an UP state earlier so
> > that radvd can start.
> 
> So why not start radvd when the first interface is added to the bridge?

With a daemon that waits for the bridge coming up? Or do you suggest
to add that complexity to VirtualBox or KVM's networking scripts?

> Or, really, make radvd aware of when the bridge comes up so it can
> handle this itself,

Ah, Adding complexity to radvd. A really nice idea.

Just for the record: For everybody else, this is a regression, since
things that used to work for years got broken in recent kernel versions.

Greetings
Marc, stopping this discussion now

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