[26155] in North American Network Operators' Group
Re: Verio Decides what parts of the internet to drop
daemon@ATHENA.MIT.EDU (Austin Schutz)
Mon Dec 6 19:18:39 1999
Date: Mon, 6 Dec 1999 16:14:33 -0800
From: Austin Schutz <tex@shrubbery.net>
To: NANOG <nanog@merit.edu>
Message-ID: <19991206161433.D14758@shrubbery.net>
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In-Reply-To: <199912062251.OAA11965@mail.crl.com>; from gherbert@crl.com on Mon, Dec 06, 1999 at 02:51:13PM -0800
Errors-To: owner-nanog-outgoing@merit.edu
>> In the far term as space becomes scarce we will need to find a solution
>>to wasted B space, but that is several years out. Perhaps by that time routers
>>will have so much memory and CPU as to make an extra ~4 million possible routes
>>negligible.
>
>The danger of /17 blocks in B space is limited to 64*256 more routes
>(16 k more, maximum).
Yes, you could arbitrarily say /17 is a fair border, and then people
would complain about their /18s being unreachable. The 4 million number
reflects 64 * 2^16 theoretical /24 routes - 64 * 256 current theoretical /16
routes = 4177920 routes. I haven't heard (yet) of people complaining about not
being able to get /25 to /32 routes globally routable.
Perhaps a somewhat less arbitrary limit corresponding to the smallest
allocation made by ARIN would be in order. That would currently be 2^(20 - 16)
* 64 * 256 - 64 * 256 = 245760 extra routes. Still a pretty highg number, but
I imagine it would take several years to break up the existing Bs.
Austin
