I am working on a system that logs someone in, from their IP address and not their username and password.
The thing is, I need to access the remote IP address rather than the router's IP address.

For example

    echo $_SERVER['REMOTE_ADDR']; 

Will only display their router IP, the one that everyone is connected to on the network and I want to display the unique IP the router establishes for them.

Any ideas?

Most routers mask the internal IP address.

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