> There is an important difference between v4 and v6 - we've already paid the
> (by now massive) deployment costs of v4.

there is another important difference between v4 and v6 - we don't have 
enough addresses for everyone to use v4.

> It would be nice if going through the immense upheaval and cost of deploying
> 6 (or whatever our next big step is) actually got us a solution to one of
> our most pressing real problems.

yes, it would.  but that has to be balanced against the cost of 
second-system effect.

Keith

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