[ppml] geo addressing

[Michael.Dillon at btradianz.com]

> Would you propose allocating /x to regional IXen?
> Of a certain size, or serving a certain (defined how?)
> region?  In addition to or lieu of existing policy? 
> IPv4 and/or/xor IPv6?

Reserve, not allocate. Someone still has to do the tough
work of analyzing world populations and the limits to growth
in order to come up with some measure of how much networking
activity to expect in each part of the world. This analysis
is needed to determine how big /x is for each city and how
to aggregate cities into larger sub-continental aggregates.

The addresses are then reserved in the same way that ARIN
reserves neighboring blocks when they allocate a block to
an ISP. At that point we will know exactly which /x belongs 
to each city. But that doesn't mean that we allocate the
addresses to exchanges in the city. The allocation may well
go to ISPs based on their network infrastructure in and around
a particular city. But in some cities, there will likely
be a consortium of ISPs and exvchanges who will administer
the allocations in the same way that APNIC NIRs administer
allocations in some countries.

All of this is IPv6 because that is where th big block of
unspecified address space exists. It does mean that in
geotopological addressing we come back to the idea of
allocating to ISPs only as many addresses as they can
justify. No /32s. However, the /48 and /64 rules continue
to apply because end-user networks are still the same.

--Michael Dillon