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Re: Multi-6 [WAS: OT - Vint Cerf joins Google]

  • From: Patrick W. Gilmore
  • Date: Sun Sep 11 13:11:17 2005 
On Sep 11, 2005, at 12:51 PM, David Conrad wrote:


On Sep 11, 2005, at 12:52 AM, Richard A Steenbergen wrote:
This says that although there are 170k prefixes on the Internet, there are
only 20k entities who actually need to announce IP space. There is only
one explanation for such a large difference (8.5x) between these two
numbers, namely that people who are announcing IP space need multiple
blocks in order to accomodate their needs.
This is an interesting assertion. I thought the majority of announced prefixes was due to folks punching holes in their registry allocated blocks in order to do traffic engineering of one form of another (multi-homing being a form of traffic engineering).

Can you point at the data which backs up your assertion (I'm not disputing it, just a curious)?
How about the CIDR report? Notice that even with maximal aggregation per AS, the average AS still announces multiple blocks.

It's really not that hard to see if you spend some time perusing the full table.

--
TTFN,
patrick