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Your absolutely right, poker sites do track IP addresses that's why you would need to use a proxy server.
However, you would seriously need ID to match your 'new foreign address' just in case they ask to verify who you say you are, and that the ID address matches the Address registered to the site. IF it doesn't then kiss your money good bye.
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You need it to match location. I use freecap to redirect the traffic to match the locations -
http://www.freecap.ru/eng/?p=proxy