Thus spake "Brian E Carpenter" <brc(_at_)zurich(_dot_)ibm(_dot_)com>
Fred, the point is that ULAs should be unambiguous, so that if they
happen to meet (e.g. via a VPN, or following a merge of two previously
separate networks) there is no collision. Currently ULAs include
a pseudo-random prefix, which leaves open a theoretical possibility
of collision. Centrally-allocated ULAs would not have this issue.
The chance is negligible until you have a number of organizations
interconnecting that approaches the AS count on the public Internet. Those
who are uncomfortable with those odds can get PIv6 space. ULA Central does
not solve any problems that the existing tools already solve, and it creates
new problems of its own.
S
Stephen Sprunk "Those people who think they know everything
CCIE #3723 are a great annoyance to those of us who do."
K5SSS --Isaac Asimov
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