How many ISPs are out there?

Tue Jul 24 14:52:10 UTC 2001

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 at 3.am [mailto:up at 3.am]
> Sent: Tuesday, July 24, 2001 7:41 AM
> To: nanog at 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 at 3.am							
>     http://3.am
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