North American Network Operators Group
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Re: AS number inconsistencies

  • From: Philip Smith
  • Date: Tue Jul 09 00:16:02 2002 
Hi Marwan,

At 09:55 08/07/2002 -0400, Marwan Fayed wrote:


I am a CS PhD student trying to track ASes (for reasons I'm happy to
discuss offline). There is a grave inconsistency I have come across and
can't explain. Simply, there seems to be many AS numbers in the
non-private range that come into use at some point in time and advertise a
range of IPs, but these AS numbers are not allocated until much later.
Can you give examples? Both the CIDR-Report, posted to this list, and my own Routing Report (which I spare NANOG of, but is "inflicted" on ARIN's rtma, RIPE's routing-wg, and APOPS :), look up every single AS which is present in the BGP table - any AS which is announced and is unregistered in any of the three registry databases is flagged in the report.

And there are only two ASes which appear, and are not registered anywhere - one is intermittent, the other, AS5757, has been there since I started this over 3 years ago.

Does any one have any explanations? Are network operators "notified" of
their new AS number well in advance of the actual receipt of that number
on paper, for example? Any help is appreciated (and hopefully this
occurence is of interest to nanog).
That tends to happen, but in my experience APNIC, ARIN and the RIPE NCC will put the entry in their database before they inform their customer of the allocation.

So, examples would be good - send to me privately if you wish and I can cross reference with my own routing table views.

philip
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