How to find the IP address on a machine using a Proxy?

[anotherDeclan]

Hi,

I have designed an intranet for a small office about 40 PC's. I am using PHP and I use peoples IP address to identify them. I use $REMOTE_ADDR to get their IP address but they are using a proxy server. Is there any way to get the IP address of the PC after it connects to the server via the proxy??

Cheers

 

[danielhozac]

That depends on the proxy. Some proxies set a [tt]X-Forwarded-For[/tt] header, which should be available as [tt]$_SERVER['X-FORWARDED-FOR'][/tt]. But there is no guarantee that this is set, and you shouldn't rely on it. //Daniel