RE: getaddrinfo address ordering [Re: IPv6 transition architecture discussion]

["Christian Huitema" <huitema@windows.microsoft.com>]

> > It will currently always fall back to v4 if one wrote it correctly:
> >  - tries AAAA (if dns returned it)
> >  - tries A (if dns returned it)
> 
> Sure.. but in this case www.google.com will not have AAAA records in,
> well, about 5-10 years.  They have no incentive to do so, _at all_ --
> quite the contrary -- as their v4-enabled users would get worse
service.

A nice point of 6to4 as a transition strategy is that its performance
are guaranteed to be very close from those of the underlying IPv4. A
normal evolution for sites like Google would be to multihome and expose
both a native IPv6 connection and a 6to4 connection. Address selection
rules will guarantee that "transition" users pick the 6to4 destination,
while native users pick the native address. This will largely deal with
your performance concern.

-- Christian Huitema