Last month I asked:
I like to get an estimate if the percentage of users 1. Using their Providers HTTP-Proxy to surf the web 2. Using their Providers DNS-Servers/recursive resolvers to resolve DNS queries
While I got no answers to these questions I received some helpful pointers from the nanog community. Probably the most helpful one was the powerpoint presentation at http://darkwing.uoregon.edu/~joe/proxies/ which gave a great overview about HTTP-proxies. Seems NOBODY is actually controlling the ROI of their HTTP-Cache-Proxies ... at least nobody seems to do proxy stats in relation to their total user base. Also Ben Edelman's paper: "Web Sites Sharing IP Addresses: Prevalence and Significance" at http://cyber.law.harvard.edu/people/edelman/ip-sharing/ was a great hint. While not about proxies it helps estimate the number of sides hit 'accidently' by using IP-filtering to block Web content. I'm just finishing a paper on the subject of censoring web content via IP-filterning, HTTP-proxies and DNS-tampering. I would be glad to send a draft of it to people interested in this matters. I would be even more glad to find somebody willing and able to review my papers coverage on the performance impact of IP-Filtering and the real-world configuration problems of BIND (only as related to blocking domains/censorship =:-). The final paper will be available on the web. Regards Max -- Maximillian Dornseif - http://md.hudora.de/ Dipl. Jur., University of Bonn, Germany - ars longa, vita brevis!