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I have a C program I made that blocks all proxy servers. I also have a Perl script that checks Netstat every 5 minutes, to see if there are too many connections from the same ip address. It will then add that ip address to the firewall (IPTables).
I don't have anything fancy. If it's for traffic trading, you can have a program that sees the percentage if traffic that is proxy servers. When it gets over a certain percentage, then it notifies you or what ever you want it to do. It pretty much depends on what program your using now for traffic trading.
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