> This hints at a general misunderstanding on how "The Internet" works.
> 
> Talking to the local ISP on "what would you recommend, IPv4 or IPv6?"
> can give an indication, but if the server you're trying to talk to 
> is on the other side of the world, the local ISP's preference for 
> IPv4-vs-IPv6 might be the opposite of what actually works better to
> reach said server.  There are many networks on the path...
> 
> Talking to far-end server need measurement on end-to-end path..So the 
> accurracy of end-to-end measurement is the key. There are acturally lots of 
> practice in the fields of NPM and APM. People can do it well. 

But in the general case the network cannot.
Think host multi-homing.

Ole
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