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Re: ISP Filter Policies--Effect is what?
From: "Stephen J. Wilcox" <steve () opaltelecom co uk>
Date: Tue, 8 May 2001 19:58:09 +0100 (BST)




On Tue, 8 May 2001, John Fraizer wrote:

On Tue, 8 May 2001, Stephen J. Wilcox wrote:


if you have a /16 why would it be broken down to /24? i would assume the
only reason you advertise /24 is because that is the size of your
assignment from the NIC, in which case you cannot advertise the /16.

if you do own the /16 then yes of course you can advertise it.

Stephen, you neglected to look at the big picture.  The "organization" has
the /16 but has sites spread out all over the planet and has assigned
/24's to them.  Additionally, they connect into the global net via diverse
providers.

Ah, I got -snip- happy there :) in that case I would question the logic of
being given a large address block only to break it into pieces all over
the world. 

I'd wonder why they dont take address space from a regional provider - if
its only /24 it cant be that mission critical for bgp and multihoming...



<snip>
Site                    BGP Advertisement       to      ISP
Amsterdam               169.61.201.0/24         AMSISP
Austin          169.61.111.0/24         Genuity & Internap
SanFran         169.61.119.0/24         Genuity & Internap
Tokyo                   169.61.202.0/24         TOKISP
Sydney          169.61.156.0/24         SYDISP


---
John Fraizer
EnterZone, Inc




-- 
Stephen J. Wilcox
IP Services Manager, Opal Telecom
http://www.opaltelecom.co.uk/
Tel: 0161 222 2000
Fax: 0161 222 2008



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