From: Anthony G. Atkielski [mailto:anthony(_at_)atkielski(_dot_)com]
BTW, giving out /64s is one reason why the IPv6 address space
will be exhausted in barely more time than was required to
exhaust the IPv4 address space.
That is not a real problem.
There are two concerns here. The first is running out of address space, the
second is running out of routing table space.
Vast swaths of address space are reserved in ways that make it possible to
effectively deploy IPv7 within subsets of the IPv6 address space.
It is not practical to manage router tables with greater than 2^64 entries.
In fact it is impractical to manage router tables with more than 2^48
entries using technology forseable in the next ten or so years.
The other side of the coin is the fact that many devices will effectively
require no more than a /128 because of the way they connect up to the
network. For example cell phones will be serviced on plans where the
subscription fee is per device. Verizon, T-mobile, cingular need no more
than one /64 each to service those networks.
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