Date: Wed, 16 May 2001 14:56:54 +0300 (EEST)
From: Pekka Savola <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
| 2) Apparently IAB/IESG proposal was not taken too seriously
| * With /48 to end-users, the address space would be exhausted;
| this would be only 16 (not really used in assignments) + IPv4 space.
Huh?
With allocations at /48, the address space available to be allocated is
64K times as big as the entire IPv4 address space, and the allocation is
done in units of 1 regardless of how big the organisation is (at least
until it gets VERY huge indeed - bigger than needed to justify a /8 in IPv4
space - just for the organisation itself, we're not talking about clients
of ISPs here - then it can get 2...)
The actual multiple of IPv4 space is closer to 4 million (2^24) in practical
terms (based upon the approximation that the average size allocation in
IPv4 is about a /24 - with all the /24's allocated, and the /16's and similar
accounting for those allocations that are smaller than a /24).
The internet as it is is probably reaching (at least) 5% to 10% of the
planet - we only need a factor of 20 (but allow 100) to cover everything, and
then add in another factor of 1000 to rid us of all the NAT around. That's
still just 100K out of the 24M available. There's still room for expansion
to another 240 times that size...
It happens that the address plan is currently only allocating 1/256 of
the total space - which matches nicely with the amount that we're likely
to need sometime in the forseeable future. Subtract off the 2/256 that
are in the "we won't use these" blocks, and the other 253/256 of the
total space is available for use, when we eventually find some way of
using it.
Allocating at /48 the address space is not about to be exhausted... (and
anyone doing large numbers of allocations to very small users can allocate
/64's by default, and /48's to anyone who asks).
kre
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