First of all, the idea of my washing machine having a globally routable
addess is a little scary.  Someone could hack in and ruin my delicates.

Second, in terms of waste, I understand what you are talking about when you
bring up the old "640K" arguement.  I remember reading an article 10 years
ago saying that the 486 processor would never see the desktop, because it
was too powerful for anything other than servers.  However, 128 bits *is*
alot, enough that you could take all the publicly routed IPv4 addresses, and
assign all of them to each square meter of the Earth's surface.  Each square
meter (and that includes water) could be assigned a full 2^32 address
space.  Until we start talking about extraterrestrial internets, I think
that 128 bit will do.

Third, I agree that summarization is a good idea.  But how should it be
implemented?  I would think geographically.  However, from my personally
experience, that wouldn't work out the best.  I've been in a office building
in Minnesota and tracerouted a machine on another floor in the same
building.  The path went from Mpls, to Chicago, to St. Louis and back.  Any
intelligent summarization will have to be based on the telecommunication
providers rather than geography.  Then you have issues of teleco moving,
merging, failing, reconfiguring, etc.  I don't know that there is a good
permenent solution.


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