Usage of ISP Proxys and DNS resolvers
md at hudora.de
Sun May 25 23:27:00 UTC 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
http://darkwing.uoregon.edu/~joe/proxies/ which gave a great overview
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.
Maximillian Dornseif - http://md.hudora.de/
Dipl. Jur., University of Bonn, Germany - ars longa, vita brevis!
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