[99911] in North American Network Operators' Group
Re: Upstreams blocking /24s? (was Re: How Not to Multihome)
daemon@ATHENA.MIT.EDU (Scott Weeks)
Mon Oct 8 20:57:31 2007
Date: Mon, 8 Oct 2007 17:52:44 -0700
From: "Scott Weeks" <surfer@mauigateway.com>
Reply-To: <surfer@mauigateway.com>
To: <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
--- drc@virtualized.org wrote:
On Oct 8, 2007, at 2:48 PM, Scott Weeks wrote:
> However, if it's less than a /24 it won't get very far as most
> upstreams block prefixes longer than a /24.
I'm curious: a couple of people have indicated they do not believe
this to be the case. Anybody have any hard data on what filters are
actually in use today?
--------------------------------------------
I found two current policies. Other companies made it too hard to find...
Sprint:
# Customers may announce routes as small as /26 for ARIN IP address blocks obtained through Sprint. Customers may announce routes as small as /28 for RIPE and APNIC address blocks obtained through Sprint.
# Peer block announcements and customer announcements for blocks obtained from other providers are limited to a /24 or smaller mask (/23, /22 etc.).
AT&T:
* not accept Customer route announcements smaller than a /24 network
scott
