Question

Possible Duplicate:
How can a server find real client IP address?

I need to let my users find very quickly and easily their local (LAN) ip.

Our network has a squid proxy so all the users sit behind it (and this is a problem for internal ip detection: all php scrips I’ve tried are able – at best – to detect proxy’s ip and not client’s).

Any kind of language working on a LAMP server is welcome…

Also a simple EXE file on Windows could work as “plan b” but I couldn’t find anything working.

Answer 1

Following @German Arlington’s answer, I think your best bet is configuring Squid to send the X-Forwarded-For header along with HTTP requests:

If set to “on”, Squid will append your client’s IP address in the HTTP
requests it forwards. By default it looks like:

X-Forwarded-For: 192.1.2.3

Then you will be able to read the ip address in PHP via apache_request_headers()

<?php
$headers = apache_request_headers();
echo $headers["X-Forwarded-For"];
?>