Comments on: IP-AS mappings http://blog.caida.org/best_available_data/2010/07/28/ip-as-mappings/ A CAIDA Blog Wed, 15 May 2013 09:28:07 +0000 hourly 1 http://wordpress.org/?v=3.5.1 By: amogh http://blog.caida.org/best_available_data/2010/07/28/ip-as-mappings/comment-page-1/#comment-984 amogh Fri, 06 Aug 2010 19:46:23 +0000 http://blog.caida.org/best_available_data/?p=581#comment-984 Hi Benson,

Thanks for the interest. I took a look at the difference between Cymru and the routing table dump from each collector individually (without combining data from any collectors). It is indeed the case that the worst-case variation is small. The largest difference I saw was 0.7% between Cymru and the Routeviews collector at WIDE. I excluded the Routeviews collector at KIXP for this analysis, as that collector does not seem to be carrying a full table.

Amogh

]]> By: Benson Schliesser http://blog.caida.org/best_available_data/2010/07/28/ip-as-mappings/comment-page-1/#comment-982 Benson Schliesser Wed, 04 Aug 2010 23:34:02 +0000 http://blog.caida.org/best_available_data/?p=581#comment-982 Interesting and useful data.

Given that none of the collectors vary significantly from your baseline, and the end result is similar to the Cymru whois data, it seems implied that the worst case variation isn’t actually that bad. Can you confirm this? For instance, if you look at each collector individually compared to Cymru whois (as opposed to comparing the complete table, based on successively added collector data) what is the worst-case variation?

]]>