Re: draft-bourbaki-6man-classless-ipv6-00

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> 2^64 address would have been enough to support the world using
> variable length subnets.  IPng evaluated this and decided that it
> was not a good idea as variable length subnets really are too
> complicated.  Instead IPng went initially with 128 bit addresses
> and, initially, /80 subnets so that we didn't have to deal with
> variable sized subnets.  This was later changed to /64 bit subnets
> to handle 64 bit mac addresses.

But since IPv6 *forwarding* is still based on longest prefix match,
plenty of people will need to learn the subtleties of how IPv6 is
*both* variable length *and* fixed size, at the same time. I don't
exactly have high hopes here...

Steinar Haug, AS2116