North American Network Operators Group

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RE: multi-homing fixes

  • From: Iljitsch van Beijnum
  • Date: Wed Aug 29 13:16:36 2001

Sorry for the late reply.

On Fri, 24 Aug 2001, Randy Bush wrote:

> the /24s of small multihomers is half the routing table (see geoff's data)

This can't possibly be correct. The last figure I read was that there are
about 70k /24s. There are about 21k AS numbers out there. This means that
by far most of the announcements, including /24s, are the result of lack
of CIDR. Either because ISPs have a relatively large number of PA blocks
(address conservation) or because of lack of aggregation.