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RE: /24s run amuck again

  • From: Michelle T
  • Date: Fri Jun 08 09:31:21 2001

Where did you get this list of prefixes? I just checked the routes you
report for our AS (7018) and every one I've check so far is aggregated. Most
are /19's and /18's.

Michelle Truman
AT&T Internet Services

-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
Richard A. Steenbergen
Sent: Friday, June 08, 2001 2:51 AM
To: nanog@merit.edu
Subject: /24s run amuck again



We all know that /24s have run amuck. According to the APNIC bgp
statistics (http://www.apnic.net/stats/bgp) view of the internet, the
current prefix distribution looks:

Routing Table Report June 08, 2001
BGP routing table entries examined: 106727

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

 /1:0        /2:0        /3:0        /4:0        /5:0        /6:0
 /7:0        /8:20       /9:5       /10:6       /11:9       /12:32
/13:77      /14:207     /15:346     /16:6905    /17:1175    /18:2174
/19:6720    /20:5247    /21:4509    /22:6779    /23:8684    /24:61402
/25:278     /26:450     /27:463     /28:489     /29:374     /30:317
/31:1       /32:58

This mean over 57% of the routing table consists of /24s. So in order to
facilitate getting this fixed, I have prepared a list of the worst
offenders and their specific blocks which (most likely) have no reason for
not being aggregated. If all of these entries could be aggregated (and I'm
certain this simple script missed some), it would reduce the routing table
by over 29,000 entries, to less the 78k. I think it's pretty obvious that
a lot of these simply have no excuse.


http://www.e-gerbil.net/ras/projects/ipaddr/24amuck.txt


A list of ASNs with the largest sized offending blocks (not overall count,
#1 is UU #2 is BBN #3 is Telstra nothing unexpected there) is:

2711  - Rock Hill Telephone Company
8112  - Bell Atlantic Internet Solutions
701   - UUNet Technologies, Inc.
11371 - Rhythms NetConnections
226   - Los Nettos
7029  - Alltel Information Services, Inc.
18687 - MGC Communications, Inc.
6595  - DoD Education Activity Network Assistance Center
1677  - ANS Communications
1785  - AppliedTheory Corporation
1326  - Advanced Networks & Services Inc.
6499  - Brooks Fiber Properties, Inc.

I highly encourage anyone interested to yell at these people.

--
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)








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