full-disclosure - Proxy Detection

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Date: Sun Apr 23 09:42:56 2006
From: j.schipper at math.uu.nl (Joachim Schipper)
Subject: Proxy Detection

On Sat, Apr 22, 2006 at 03:31:31PM -0500, Justin Terry wrote:
> Hello List!
> 
> I am a long time reader,  first time poster, and everything like that.
> 
> I use a proxy service that runs in my system tray, (the onion router, and
> privoxy, in conjunction) and when i use this software, everything works great.
> When i go to www.whatismyipaddress.com however, it tells me that a
> proxy server is detected.
> 
> How is it possible for them to detect that i am using a proxy?
> 
> (also, sometimes it can detect that i am using a proxy, and other times it can
> not, although i use the same software all the time.)

One other option would be to have a list of IP addresses of proxies
handy, and perform a simple lookup.

		Joachim