6to4 borkeness (Was: Google and IPv6)

[Joe Abley]

On 20 Mar 2008, at 15:59 , Steve Wilcox wrote:

> What is the advantage to take a v4 client accessing a v4 service and  
> then go and drop an asymmetric mtu reduced v6 tunnel in the middle  
> anyway?

That's a good question for www.google.com.

Another question is: if you assume that v4 clients are going to try  
and kill the user's experience by tunnelling requests over v6 before  
falling back to v4, is it better for that fallback to happen quickly,  
or not at all?

Neither of these questions are especially pertinent for  
ipv6.google.com, though, since (AIUI) you can't reach that over v4 (at  
least, the DNS gives no clues as to how to do so).


Joe