[libvirt] [PATCH] Fix dnsmasq/radvd on bridges not being able to be bound to IPv6 address on "recent" kernels

[Daniel P. Berrange]

On Wed, Jun 20, 2012 at 12:00:37PM +0200, Benjamin Cama wrote:
> > Wow, very thorough research! Thanks for figuring this out!
> 
> Thanks. It took me almost two days to figure this out and find a working
> solution. Interesting debugging, though, as I learned quite a lot on
> bridges and IPv6 DAD.
> 
> > I'm leaving the country in 48 hours and may not be able to review this
> > before I go. If anyone else wants to take a crack at it so it can go
> > into this release, that would be wonderful. Otherwise I'll get to it as
> > soon as I possibly can.
> 
> Thanks.
> 
> And I've found a solution for radvd: use the “IgnoreIfMissing” flag in
> its config so that it continues running even if it find the interface
> down on startup.
> 
> BTW, I'm also hesitating to set the VIR_NETDEV_TAP_CREATE_PERSIST flag
> automatically when no tapfd pointer is given, as currently, with my
> patch, if you call virNetDevTapCreate() without
> VIR_NETDEV_TAP_CREATE_PERSIST and without tapfd argument, the device
> will disappear immediately. I don't know if implicitly setting a flag is
> a good idea, though.

There are only a few callers of this API, so I think it is reasonable
to just update the callers as needed, rather than implicitly setting
the flag.

Daniel
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