[Dnsmasq-discuss] Serving multiple addresses via DHCPv6

[aloysius at eclipso.eu]

--- original message ---
From: Simon Kelley <simon at thekelleys.org.uk>
Date: 08.09.2013 16:36:20
To: dnsmasq-discuss at lists.thekelleys.org.uk
Subject: Re: [Dnsmasq-discuss] Serving multiple addresses via DHCPv6

> On 08/09/13 15:08, aloysius at eclipso.eu wrote:
> > From: Simon Kelley <simon at thekelleys.org.uk>
> >
> >> Best of luck. The DHCPv6 protocol allows this, in theory, but how
> it
> >> should work in practice is not really settled, in my experience.
> Do you
> >>
> >> have a DHCPv6 client that will do the work? All the clients I've
> tested
> >>
> >> seem to only request or expect a single address.
> >>
> >> dnsmasq-2.66 includes a serious rewrite of the DHCPv6 code which
> allows
> >>
> >> it to offer multiple addresses. You should use that, or preferably
> the
> >> 2.67test releases, to have any chance of success.
> >>
> >>
> >> Certainly don't expect it to "just work", but do report
> back on
> >> the
> >> results of your efforts: we may be able to help further, and improve
>
> >> dnsmasq in the process.
> >
> > Using 2.67 I tried using an ULA range (with and without static leases)
> and a global range.
> > Windows 7 worked perfectly, taking both addresses assigned via dhcpv6.
>
>
> Well, this post and Roy's about dhcpcd shows that I was maybe too
> pessimistic about the state of client support.
>
> I'm pleased that many clients and the current dnsmasq code seem to get
> this right.
>
> > Linuxmint 15 (networkmanager 0.9.8) worked well only if the first address
> is served via dhcpv6
> > and the second one via slaac; if both ranges are dhcpv6 it does something
> weird: it assigns the
> > ULA address to the interface, flushes it and then adds the other one.
>
>
> It may be worth talking to the networkmanager devs about that. My
> impression is that to make it work under those circumstances will
> require smarts in both the DHCPv6 client and networkmanager.

I've been informed it's a known bug (https://bugzilla.gnome.org/show_bug.cgi?id=681764)
and they're apparently working on it.

Also I can confirm that dhclient alone works perfectly in handling two addresses.