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

[Keith Moore <moore@cs.utk.edu>]

> > 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.
> 
> This would help only if all v6 users, v6-native included, would enable
> 6to4 as an "optimization technique", as proposed previously.

I don't buy it because it's an all-or-nothing argument. v6 deployment isn't 
going to be uniform across the world, or across applications.  Some places 
will deploy native v6 aggressively; other places will feel more satisfied 
with their existing v4 infrastructures.  Some applications will naturally
favor v6, others will favor v4, others will be agnostic about it.

Keith