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KevinL wrote

Please, please, please, do _not_ use IP numbers to verify it's the same connection. You guys don't have the problem in .us, but out here at the fringes (.au, and presumably .uk and similar), proxy server use is rampant - and leaning on IP breaks, because proxy's share the connection around.

worse yet, the customer may not even be aware of the proxy, if the network provider is using some sort of device like those cruddy cisco transparent proxies (hi Kev!) having spent a fair chunk of the last week dealing with issues of caching and general mangling caused by dodgy and strange proxies, I can only add that if it's possible for a proxy to do something wierd and wrong (like, lie about the original IP address) assume that it will. Anthony