[40702] in North American Network Operators' Group
RE: Natural class B address
daemon@ATHENA.MIT.EDU (Daniel Golding)
Fri Aug 17 17:50:03 2001
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From: "Daniel Golding" <dgolding@yahoo.com>
To: "Sean M. Doran" <smd@clock.org>, <nanog@merit.edu>,
<saeyul@netvein.com>
Date: Fri, 17 Aug 2001 17:49:28 -0400
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You are going to have a very difficult time getting anything like global
routability like this. /21s out of classical class B blocks are problematic.
Negotiate the return of the /16 to an RIR, but requesting several /20s from
current RIR issued space. You will be a good internet citizen and have
superior routability.
For classical class B space...
/16 - almost certainly routable (nothing is absolute...)
/17-/20 - Decent chance of routability
/21-/24 - Will be filtered by some, but not all.
/25-/32 - filtered by most
- Daniel Golding
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
Sean M. Doran
Sent: Friday, August 17, 2001 5:29 AM
To: nanog@merit.edu; saeyul@netvein.com
Subject: Re: Natural class B address
Sae writes:
| Have question about filtering policy on the natural class B address block.
| Trying to use /21 or shorter for various places including international,
| from the natural class B block, we have now. Do you see any problem on
| announcing as /21 to the Internet?
Yes. Give it back. Renumber into best-fit CIDR blocks from
your provider(s) and/or IRR(s).
Be a good citizen of the global routing tables, or be filtered.
Sean.
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