Re: ARIN allocating /20 netblocks?

["Patrick W. Gilmore" <patrick () priori net>]

At 12:36 PM 5/15/98 PDT, Mark D. Nagel wrote:
> One of our customers was recently allocated a /20 netblock from ARIN. 
> I had just been ass-u-ming it was a /19 until I cross-checked our
> announcement update with the request from the customer.  Is this a
> change in policy (I thought they only allocated /19 or bigger) or did
> I miss something?  If the former, are NSPs like Sprint planning to
> update filters to route these new smaller blocks?

Check the ARIN page, http://www.arin.net/initial-isp.html.

Essentially, ARIN allocates a /21 or /20 of a "Reserved" /19.  When our
downstream got a /19 from ARIN, he announced the full /19 to defeat the
Draconian Sprint 112 filters and copy-cats.

Check with your downstream.  They probably have a reserved /19 they can
announce.

And, of course, double-check with ARIN as this isn't my customer we're
talking about. ;)

> Mark D. Nagel <nagel () intelenet net>, CCIE #3177

TTFN,
patrick

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Patrick W. Gilmore                      voice: +1-650-482-2840
Director of Operations, CCIE #2983        fax: +1-650-482-2844
PRIORI NETWORKS, INC.                    http://www.priori.net
              "Tomorrow's Performance.... Today"
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