Real IP address from behind Proxy or NAT

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A discussion came up on VBForums about how to get the real IP address of a user, not that of their proxy server or the external NAT address. I was quite sure that this wasn't possible without some kind of process getting the address on the client machine.

I have suggested that these sites could be using Java to get the real IP address, however, I could be wrong and for me the script that I found always returns 127.0.0.1 . This suggests to me that any script attempting to obtain the hosts real IP address infarct rely s on the HTTP-X-FORWARDED-FOR header sent by the proxy server.

Can anyone explain this? I have no idea how it can be done, if at all 😕

Thread at VBForums: http://www.vbforums.com/showthread.php?t=374395

Thanks

_theworks

The link you have posted
http://www.vbforums.com/showthread....381#post2266381 doesnt take me to a thread about "Real IP address from behind Proxy or NAT"

BTW i dont think it is possible to get the real IP of a user behind a proxy. unless java maybe? but i dont think so. and i think most scripts boasting 'the real IP' rely on the HTTP-X-FORWARDED-FOR header sent by the proxy server. which can be very misleading..

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Thanks for the reply. I've ammended the link, I don't know how I manage to get it wrong. Whether or not it is possible, I can't really see any usefulness behind having the users real IP address. In most cases it will probably be an internal address anyway.

_theworks

heh yeh i also noted that most people claiming to have seen these sites never really gave any examples like a URL? there are plenty of threads on this forum related to this topic.

The IP isnt a reliable way of tracking users they are subject to change im not really sure of a good user tracking method besides cookies but they can be deleted.. so :queasy: