From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: Bridge stays down until a port is added
Date: Mon, 26 Sep 2011 15:42:25 -0700
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Cc: Marc Haber <mh+netdev@zugschlus.de>, netdev@vger.kernel.org
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> And this might also allow to set an IPv6 address on a dummy interface, which Marc Haber reported as 
> not being allowed for now, probably because DAD cannot succeed on a dummy interface and as such, a 
> bind() cannot be allowed, and as such, setting the IPv6 address is currently useless.

For dummy, the interface should probably have the IFF_NOARP flag set.
There isn't any point in doing network discovery on a non-connected
interface. That would make DAD a no-op and bind would work.