Re: IPv6 traffic stats - limitations of 6to4

Pekka Savola   (1-12/1-31/200x) 11/12/08 9:09 PM:
> If an implementation implements RFC3484 and the user is not using 
> custom address selection policy, all compliant RFC3484 implementations 
> should prefer v4 when connecting to native from 6to4 (rule 5 of 
> destination address selection AFAIR).
Can we derive from this that Google's IPv6 address is necessarily 6to4 
(most of its US customers using it are 6to4), and that Google has 
therefore a guaranteed path toward other 6to4 hosts?
Besides, isn't this a strong reason in favor of native IPv6 (albeit like 
Free did it with 6rd on its IPv4 infrastructure) vs 6to4?
RD
> FWIW, in Linux this was changed as the default maybe about 2-3 years 
> ago.  I suppose may other operating systems, especially recent ones, 
> also operate in this manner. For Linux, some info is here: 
> http://people.redhat.com/drepper/linux-rfc3484.html
> This has been discussed on v6ops and ipv6 lists but unfortunately I 
> can't find the threads despite search attempts.
> Maybe someone else with better memory could provide better references.
>
> This is why observing ipv6 traffic on a dual-stack hostname will 
> mostly just in observing those that use native v6 (with Mikael, this 
> was 0.5% of users).
Except if the dual stack server, like that of Google, uses different 
URLs for IPv6and IPv4, right?
> If you're interested in wider picture of IPv6 penetration, you'll put 
> the content on v6-only hostname (with Mikael, this was reachable by 6% 
> of users). If you want to also cover for Vista users with Teredo, 
> you'd put the content on a site and refer to it using a numeric 
> address instead of a hostname (this would result in even a higher 
> percentage).
> So, if you're interested in any kind of IPv6 connectivity at all (even 
> 6to4, teredo, ...), at least in some user communities (p2p users), I'm 
> pretty sure IPv6 penetration is already over 10%.  At least 6% is 
> already proven by measurements :-)
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