Ideas on Detecting Proxy Use?

Von Elm, William J billve at
Wed Apr 24 23:48:16 GMT 2002

Hi All,
   Does anybody have any insight or references on how to determine if the
traffic inbound to a webserver is coming from a proxy such as AnalogX or
Squid?  Do these proxies use a predictable range of source ports or are
there any other characteristics that can serve to 'fingerprint' them?
Thanks in advance for your thoughts.

Bill Von Elm
Brookhaven Nat'l Laboratory
billve at

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