ISP Filter Policies--Effect is what?

Stephen J. Wilcox steve at opaltelecom.co.uk
Tue May 8 18:58:09 UTC 2001



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





More information about the NANOG mailing list