This post originated from an RSS feed registered with .NET Buzz by Duncan Mackenzie. Original Post: With things like AOL and other proxies... how useful is IP Address in figuring out duplicate... Feed Title: Code/Tea/Etc... Feed URL: /msdnerror.htm?aspxerrorpath=/duncanma/rss.aspx Feed Description: Duncan is the Visual Basic Content Strategist at MSDN, the editor of the Visual Basic Developer Center (http://msdn.microsoft.com/vbasic), and the author of the "Coding 4 Fun" column on MSDN (http://msdn.microsoft.com/vbasic/using/columns/code4fun/default.aspx). While typically Visual Basic focused, his blogs sometimes wanders off of the technical path and into various musing of his troubled mind. Latest .NET Buzz Posts Latest .NET Buzz Posts by Duncan Mackenzie Latest Posts From Code/Tea/Etc...

I'm playing around with my voting control and I was thinking of (in addition to a cookie based check) querying to see how recently this IP address had tried voting and if it was within 'x' seconds, rejecting the vote...

Something more extreme, like rejecting any second vote from the same IP seems wrong, since multiple people could be coming in through the same IP.. in fact, you have to assume that is likely over time...

What do you folks think? Is a time-limit per IP address reasonable, or will that produce 'odd' behaviour for corporate and large ISP users?