Re: IPv6 with DHCP -- how is default route set?

[Eloy Paris <peloy chapus net>]

Hi Jocef,

On Tue, Oct 20, 2015 at 02:03:36PM -0400, Josef Bacik wrote:

> On 10/20/2015 12:37 PM, Eloy Paris wrote:
>
> > > Usually, the default gateway comes via the Router-Advertisements.
> > >
> > >
> > > I would rather expect that you choose
> > >
> > >   "Automatic",
> > >
> > > which will use RA + DHCP6 (if the RouterAdvertisements indicate to
> > > use DHCP).
> > >
> > > "Automatic, DHCP only" will not use RA at all.
> >
> > I see. I had been using "Automatic, DHCP only" because I thought that
> > when using "Automatic" nothing happened (no global IP address was
> > obtained). However, I just tried and it worked, and a default IPv6
> > route was even installed.
> >
> > I realize now that it is not that nothing happened but that things
> > took a long time (a couple of minutes) to happen -- first, there was
> > a delay to get an IPv6 address, and then there was a delay (after
> > the interface had a global IPv6 address) to see the default route
> > installed.
> >
> > Are these delays normal; do they depend on the frequency of router
> > advertisements? If so, can NM not elicit a router advertisements by
> > sending a router solicitation? If that is what is supposed to happen
> > then I don't understand the delays. In contrast, IPv4 configuration
> > is immediate.
>
> Part of the problem is NM groups together route discovery and SLAAC,
> this makes it unusable for us in our ipv6 only clusters. I'm in
> the process of fixing this now so you can still have proper route
> discovery and use dhcpv6 or static addressing and then you'll get the
> immediate ipv6 configuration. Thanks,

That'd be nice; I look forward to this in a future NM release.

Cheers,

Eloy Paris.-