Re: implications of 6to4 for v6coex

["Erik Kline" <ekline@ekline.com>]

>>> Well it seems to be working well enough (or popular enough, anyway).
>>> What if I said that 69.8% of IPv6-enabled users who visit google.com
>>> have 6to4?
>
> That's the least I'd expect, as an author of 6to4 ;-)
>
> Any stats for Teredo?

This test was against a dual-stacked hostname.  Teredo comes in around
1.2%.  The same or less than ISATAP.

A full presentation by the engineer who did the work will be at
RIPE57.  (I tried to find a reference to Steinar Gunderson's talk on
http://www.ripe.net/ripe/meetings/ripe-57/meeting-plan.html and
related but I seem to be having connectivity problems.)  Hopefully I
haven't stolen any thunder.

>> So, my understanding is that this test is to a hostname with A and AAAA
>> records, right? That would make sense, as Teredo will only be used by XP
>> SP2 and Linux boxes who have Teredo enabled (Vista prefers A over AAAA
>> if it only has Teredo IPv6 connectivity).
>>
>> I don't think that you can accurately say that that you tested all IPv6
>> enabled users, because you aren't testing whether they are Vista and
>> have Teredo enabled. Point em at a hostname with only AAAA and my
>> expectation is that you'll significantly see different results - close
>> to what I see, which are like:
>> - ~90% Teredo
>> - ~7-8% 6to4
>> - rest Native

Yeah, but this doesn't represent reality for me as a content provider.
 We spoke about this at APNIC26, IIRC, but to put it on-record on the
list:

I (with my Google hat on) am not interested in "how much Teredo is
_deployed_", e.g. in the sense of "how much Teredo _might_ I see".
I'm interested purely in "how much Teredo am I _actually_ seeing", to
help answer the question "should I bother to deploy my own Teredo
relay and/or actually have Teredo VIPs for services?".  Right now that
answer appears to be "don't bother yet".

And, to state the obvious, google.com is never going turn off IPv4 and
still leave IPv6 up for any service until there's so few IPv4 users
that it's operationally not a financial win (i.e. we save more money
operationally by turning it off than revenue sacrificed by doing so).

Not that Teredo isn't amazing and can leap tall buildings and make my
espresso for me; I understand.  :-)
-Erik