Microsoft: Give Xbox One users IPv6 connectivity

Lorenzo Colitti lorenzo at
Thu Oct 10 05:25:58 CEST 2013

On Thu, Oct 10, 2013 at 12:19 PM, Geoff Huston <gih at> wrote:

> But I've thought about your response, and if I'm allowed to dream (!), and
> in that dream where the efforts of COmcast, Google etc with IPv6 bear
> fruit, and I'm allowed to contemplate a world of, say, 33% IPv6 and 66% V4,
> then wouldn't we then see the remaining Teredo folk having 33% of their
> peer sessions head into Teredo relays to get to those 33% who are using
> unicast IPv6? And wouldn't that require these Teredo relays that we all
> know have been such a performance headache?

Can't you fix that by telling the app "if all you have is Teredo, prefer
Teredo even if the peer has native IPv6 as well"?

Of course this breaks down when IPv4 goes away, once IPv4 starts going away
then there's really way to do peer-to-peer without relays, right? (Also,
IPv4 going away is relatively far away at this point.)
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