[Oneiric topic] IPv6

Mathieu Trudel-Lapierre mathieu-tl at ubuntu.com
Tue Apr 19 16:35:36 UTC 2011

On Tue, Apr 19, 2011 at 12:03 PM, Scott Kitterman <ubuntu at kitterman.com> wrote:
> On Tuesday, April 19, 2011 09:50:27 AM Mathieu Trudel-Lapierre wrote:
>> For Oneiric, my plan is to change that default for new interfaces to
>> Automatic IPv6 and not requiring IPv4 or IPv6 to bring up interfaces,
>> which should make almost everyone happy.
> What's the delay caused to get an IPv4 address when it tries IPv6 first and
> fails?

Right now, IPv4 is tried first, but the IPs are only committed to the
interface and routing is set once IPv6 has received an address or
timed out (timed out, in the case I just tested). My testing gave me a
delay of 30 seconds between the interface going up ("eth0: Link is up
at 100 Mbps, full duplex" log from the driver) to the IP being set and
me being able to ping Google (and ntp's message about syncing the

It's pretty high, but I think this can be fixed by committing IPs and
routes as soon as IPv4 comes up; and it's an issue we can work on
during the cycle. I've discussed this on IRC with the NM developers, a
couple of ideas have come up.

Mathieu Trudel-Lapierre <mathieu-tl at ubuntu.com>
Freenode: cyphermox, Jabber: mathieu.tl at gmail.com
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