nanog mailing list archives
BGP filtering of supernets out of classful space
From: Jeff Haas <jeffhaas () merit edu>
Date: Fri, 19 May 2000 11:47:06 -0400
In attempting to help someone with regards to BGP announcement filtering from the IRR we've found the following situation: A provider in China has been assigned addresses in the traditional class C space. APNIC's assignment is a /16 for this allocation. Said provider, trying to be good Internet citizens are announcing only aggregates of /16. However, they're running into several providers that are filtering the announcements because they aren't /24. Experimentation has proven that announcing /24's will solve this problem. This obviously clutters up the global routing tables. The primary justification I can see for such filtering is to prevent "sink routing" - or catching everything else where more specific routes don't exist. (This would probably be a Bad Thing for the provider foolishly making such announcements - a very effective self DoS attack.) What methodology are providers using for these types of route filtering issues now? (I'll save the IRR pulpit for later.) And yes, I have directed the provider having the routing issues to contact each ISP doing the filtering separately. -- Jeffrey Haas - Merit RSng project - jeffhaas () merit edu
Current thread:
- BGP filtering of supernets out of classful space Jeff Haas (May 19)
- Re: BGP filtering of supernets out of classful space Daniel Senie (May 19)
- Re: BGP filtering of supernets out of classful space Jeff Haas (May 19)
- Re: BGP filtering of supernets out of classful space John Fraizer (May 19)
- Re: BGP filtering of supernets out of classful space Michael Hallgren (May 19)
- RE: BGP filtering of supernets out of classful space Roeland Meyer (E-mail) (May 19)
- Re: BGP filtering of supernets out of classful space Randy Bush (May 19)
- Re: BGP filtering of supernets out of classful space Jeff Haas (May 22)
- Re: BGP filtering of supernets out of classful space Randy Bush (May 19)
- <Possible follow-ups>
- Re: BGP filtering of supernets out of classful space Danny McPherson (May 19)
- Re: BGP filtering of supernets out of classful space Danny McPherson (May 19)
(Thread continues...)
- Re: BGP filtering of supernets out of classful space Daniel Senie (May 19)