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It there a source where I can obtain a large up to date list of proxy ips? I would like to limit users votes on a website if they are using proxy.

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That sounds like a classic case of whack-a-mole to me. –  Sirex Feb 22 '12 at 12:02
    
@Sirex It's not the best solution, but I need to detect as many proxies as I can to minimize vote rigging. Do you have a better solution for detecting proxy? –  user80666 Feb 22 '12 at 12:13
    
dont rely on the connection used to detect vote rigging ? Use some form of authentication, surely ? –  Sirex Feb 22 '12 at 12:18
    
@Sirex It's not a type of site where you would be confirming user's real identity, just votes on comments, posts etc... I just want to minimize the effect of multiple account voters. –  user80666 Feb 22 '12 at 12:20
    
by multiple account, can you not just log the usernames that have already voted and go from that ? It sounds like alot of hassle on their part to try and make multiple accounts on the site just to vote something up a few times, and equal amount of effort on your part to track an ever changing list of proxy addresses. –  Sirex Feb 22 '12 at 12:25
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closed as off topic by Tom O'Connor, jscott, Bart De Vos, RobM, Shane Madden Feb 22 '12 at 17:34

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2 Answers

Instead, restrict access based on the presence of the X-Forwarded-For: header.

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This is likely the best bet. It's not fool-proof, but its a lot better than tracking a proxy list. –  Sirex Feb 22 '12 at 13:43
    
The problem with this approach is that there are many private proxies that do not add those headers. –  user80666 Feb 22 '12 at 20:46
    
I highly suspect you're over engineering a solution to a problem that doesn't exist. In reality how many people actually bother to vote on things, let alone use proxies to game the system ? –  Sirex Feb 24 '12 at 7:39
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You could use cookies and/or evercookies to track which users have voted before and/or which users have been seen using known proxies (such as those identified by the X-Forwarded-For: header).

I suspect this will be far more reliable than trying to find a list of "all" public proxy servers.

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