vB uses these server variables to establish which IP is used for a member...
This is used first...
Code:
$_SERVER['REMOTE_ADDR']
If any of these are set, then the IP used is changed to the set value...
Code:
$_SERVER['HTTP_X_FORWARDED_FOR']
$_SERVER['HTTP_CLIENT_IP']
$_SERVER['HTTP_FROM']
Then if a proxy list is defined in config.php, the IP can be changed again to the proxy IP.