routing table size
Richard A Steenbergen
ras at e-gerbil.net
Mon Jul 29 23:43:32 UTC 2002
On Mon, Jul 29, 2002 at 03:35:19PM -0700, Brian wrote:
>
> the large quantity of /24 announcements is, I suspect, from comapnies just
> large enough to want the benefits of multihoming. You know, 2 t1s on a
> small router, and stuff like that..
Everyone and their mother says they "suspect" that, but noone ever proves
it. Ever wonder why?
Let's take it by the numbers:
Total ASes present in the Internet Routing Table: 13448
Origin-only ASes present in the Internet Routing Table: 11641
Origin ASes announcing only one prefix: 5154
Transit ASes present in the Internet Routing Table: 1807
Even if every origin-only AS was a smalltime company with just enough IPs
for a /24, it would take around 6-7 /24s each to account for the number of
/24s announced.
If someone has done an actual study of where these /24s (and probably /23s
too) come from, please point it out. Until then, my money is on clueless
redist connected/statics, large cable/dsl providers who announce a /24 per
pop/city/whatever to their single transit provider, and general ignorance.
Why attribute to functionality what can easily be explained by
incomptence. :)
--
Richard A Steenbergen <ras at e-gerbil.net> http://www.e-gerbil.net/ras
PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6)
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