North American Network Operators Group

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Re: IPv6 Wow

  • From: Mikael Abrahamsson
  • Date: Mon Oct 13 02:18:27 2008

On Mon, 13 Oct 2008, Nathan Ward wrote:

6to4 is enabled by default in Vista - any Vista machine with a non-RFC1918 address will use 6to4. It is also available in some linksys routers, and is enabled by default in Apple Airport Extreme.

I've been told there is a difference between OEM and non-OEM Vista machines when it comes to Teredo being activated or not.

Perhaps a good way to do it is advertise outside Europe, but have the providers that get your advertisement out there prepend their AS a few times as it leaves. That way, US providers will still prefer US 6to4 relays (ie lower latency) but any who don't get a route from the US will us your relay in Europe. Kinda gets you best of both worlds.

Yeah, that's been one option as well, prepending 2-3 times to our peers/transit in the US is probably a good middle way.

Regarding some numbers on 6to4 and Teredo usage, I'd like to point people to this thread on the ipv6ops IETF list:


If someone has some nice code that'll take a list of IPv6 addresses and break it down to geographical distribution of native/teredo/6to4, I'd be more than happy to run it on my data.

Mikael Abrahamsson    email: [email protected]