[50442] in North American Network Operators' Group
Re: routing table size
daemon@ATHENA.MIT.EDU (Richard A Steenbergen)
Mon Jul 29 19:44:05 2002
Date: Mon, 29 Jul 2002 19:43:32 -0400
From: Richard A Steenbergen <ras@e-gerbil.net>
To: Brian <bri@sonicboom.org>
Cc: "nanog@merit.edu" <nanog@merit.edu>
In-Reply-To: <20020729153340.T10587-100000@entwistle.sonicboom.org>
Errors-To: owner-nanog-outgoing@merit.edu
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@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)
