[32875] in North American Network Operators' Group
RE: Filtering levels (was RE: multi-homing without the BGP (was RE: Packet Loss))
daemon@ATHENA.MIT.EDU (Daniel Golding)
Fri Dec 15 15:37:12 2000
From: "Daniel Golding" <dan@netrail.net>
To: "Jonathan Disher" <jdisher@eng.bamboo.com>, <nanog@merit.edu>
Date: Fri, 15 Dec 2000 15:29:34 -0500
Message-ID: <FHEBKELAPEKHCBCFIEBBOEIBCAAA.dan@netrail.net>
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Jonathan,
It is not safe to assume that. Verio, amongst others, still filters at ARIN
allocation boundaries. Also, those trying to subnet old class B address
blocks, will have significant problems, even at the /17 level. If you have
upstream(s) willing to advertise aggregates for you, that's the best way to
handle this problem in a discontiguous network.
- Dan Golding
NetRail, Inc.
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
Jonathan Disher
Sent: Friday, December 15, 2000 2:43 PM
To: nanog@merit.edu
Subject: Filtering levels (was RE: multi-homing without the BGP (was RE:
Packet Loss))
On Fri, 15 Dec 2000, Daniel Golding wrote:
> advertise blocks smaller than a /20 to each other (/24 is a more normal
> filtering level these days). Also ensure that whichever of the upstreams
Is it safe to assume[*] that an announced /23 will not be filtered by any
major (or even the minor) backbones? We just got our ARIN allocation (and
I won't go into that, the lag time was all my fault), and I'm currently
planning allocation for some remote offices and a couple of hosted
buildouts. I'm hoping to not have to announce anything larger than a /23
from any one site unless necessary.
-j
[*] - It's never safe to assume anything internet related; relatively
speaking, is it safe...
-Jonathan Disher
-Systems and Network Engineer, Web Operations
-Internet Pictures Corporation, Palo Alto, CA
-[v] (650) 388-0497 | [p] (877) 446-9311 | [e] jdisher@eng.ipix.com
