nanog mailing list archives
Re: Upstreams blocking /24s? (was Re: How Not to Multihome)
From: "Scott Weeks" <surfer () mauigateway com>
Date: Mon, 8 Oct 2007 17:52:44 -0700
--- 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
Current thread:
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Scott Weeks (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Vince (Oct 09)