Re: IPv6 default routes / NM vs. kernel autoconfig

[Dan Williams <dcbw redhat com>]

On Fri, 2012-08-03 at 11:59 +0200, Jiri Popelka wrote:
> On 08/02/2012 09:50 AM, Tore Anderson wrote:
> > * Stuart Gathman
> >
> >> The problem is, I don't want the auto IP, *or* the private IPs.  I
> >> just want the DHCP6 IP.  But when I select "DHCP only" in NM, it
> >> then assigns only the DHCP IP, but no route!   The behaviour I expect
> >> with DHCP only is to still assign the route from RA.
> > The «DHCP Only» IPv6 method is unfortunately fundamentally broken, as
> > you've experienced. I believe that when it was implemented, it was
> > under
> > the assumption that DHCPv6 would (like DHCPv4) be able to completely
> > configure the network, including setting up routes. That is not the
> > case, however. I wouldn't be surprised if the "DHCP Only" method would
> > be removed or hidden/deprecated in the future. Don't use it.
> 
> I think Dan had removed it once but then added it back due to
> https://bugzilla.redhat.com/show_bug.cgi?id=612445

That's correct, but at the time that bug was filed I did not know enough
about IPv6 configuration to suggest the correct course of action.  I now
know much more and realize that adding it back was a mistake.  We should
really deprecate that option and just alias it to "automatic".

DHCPv6-only without RAs is fundamentally broken.  Any valid
configuration needs RAs, if only for the default route.

Dan