North American Network Operators Group

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Re: Usage of ISP Proxys and DNS resolvers

  • From: Maximillian Dornseif
  • Date: Sun May 25 19:29:07 2003

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
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 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 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.



Maximillian Dornseif -
Dipl. Jur., University of Bonn, Germany - ars longa, vita brevis!