[99916] in North American Network Operators' Group
Re: Upstreams blocking /24s? (was Re: How Not to Multihome)
daemon@ATHENA.MIT.EDU (Justin M. Streiner)
Mon Oct 8 21:35:07 2007
Date: Mon, 8 Oct 2007 21:28:53 -0400 (EDT)
From: "Justin M. Streiner" <streiner@cluebyfour.org>
To: nanog@merit.edu
In-Reply-To: <Pine.LNX.4.61.0710082113030.24441@soloth.lewis.org>
Errors-To: owner-nanog@merit.edu
On Mon, 8 Oct 2007, Jon Lewis wrote:
>> adopted /24 as the cutoff point. If you make the cutoff point smaller,
>> what is the new point... /26? /32?
>
> Anything longer than /24 is unlikely to propogate far on the internet. You
> can all check your filters to see. I just checked mine, and neither Level3
> nor Time Warner has tried to send me anything longer than /24 in recent
> history. If they did, it'd show up as hits on a distribute-list deny rule.
I realize that - I was posing a rhetorical question to the previous
poster :)
> This is actually in the ARIN "rules". Multihoming is justification
> (regardless of utilization) for one of the multihomed network's providers to
> assign them a /24.
Been down that road a few times too, both as a provider and a customer.
jms
