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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Upstreams blocking /24s? (was Re: How Not to Multihome)
--- [email protected] 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
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