North American Network Operators Group
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Re: as numbers

  • From: Joe Abley
  • Date: Sat Jul 30 16:09:45 2005 
On 30 Jul 2005, at 15:03, Hank Nussbacher wrote:


On Sat, 30 Jul 2005, Daniel Karrenberg wrote:
The RIPE NCC has hit strong resistance to reclamation, most often with
the argument that the ASes are used in inter-domain routing on the
Internet but our BGP data collectors just do not see the paths
concerned. It takes considerable effort to do reclamation properly
whithout putting the future user of any reclaimed number space at risk!
Anyone who uses the argument of inter-domain routing that are not seen by
any data collectors on the Internet should be pointed at RFC1930 and told
to renumber their private ASNs.
Just because public route collectors can't see use of an ASN, that doesn't mean the ASN isn't in use; just because it can't be seen doesn't mean it's private-use: it might still feature on routes announced on the Internet, even if the routes don't propagate globally.

For a trivial example of this, consider a multilat route server at an exchange point. Unless you measure from within (or downstream of) a peer of the route server, you'll never see the AS number in an AS_PATH attribute. It's fairly clear to me that this is not a suitable candidate for private-use numbering, however.


Joe