Sprint is the worst for pre-fix filtering for all but their own customers. I recently went through this with my old /24. It's still SWIP'd to MHSC but I can't use it.

-----Original Message----- From: up@3.am [mailto:up@3.am] Sent: Tuesday, July 24, 2001 7:41 AM To: nanog@merit.edu Subject: RE: How many ISPs are out there?

On Tue, 24 Jul 2001, Roeland Meyer wrote:

...

some exceptions <Qwest?>) use BGP either. Then there is the old route pre-fixing problem. Not many ISPs, smaller than /19, are going to be doing effective ASN's either.

I would take issue with the assertion that you need a /19 or larger to "be doing effective ASNs". My understanding is that as long as you get a block from former class C or "the swamp", you should be visible everywhere. We recently requested, and got a /21 from 65/8 from Sprint. A phone call and some pleading got them to change that to 208.8.16.0/21

AFAIK, that's reachable everywhere from AS19975 If that's *not* correct, I'd sure like to know...

James Smallacombe PlantageNet, Inc. CEO and Janitor up@3.am http://3.am ============================================================== ===========