Getting user IPs

[Gingetsuryuu]

I've found out my pc has two ips, one that is common for all adsl users in south africa, and one to uniquely identify each of us, on my site I use $_SERVER['REMOTE_ADDR'] to obtain the ip of the user browsing, but with adsl users from south africa it shows the ip thats common for everyone, and that seriously messes some stuff up. Is there a way to get the other ip or something?

Modify: Here's the ip, this forum gets it too. 198.54.202.66

[trq]

Lots of isp's are set up this way. Not much you can do about, ip's are a pretty unreliable way to keep track of clients.

[Gingetsuryuu]

Hmm... It should be possible, shouldn't it? I know some ip obtaining sites like whatsmyip can get the other ip as well?

[trq]

You should only have one public ip, and one internal ip.

[Gingetsuryuu]

Well, I live in a screwed up country kinda :p

Anyway, i got it figured.

$headers = apache_request_headers();
$hostname = $headers['X-Forwarded-For'];

would make hostname my real ip, but thats only if the X-Forwarded-For thingey exists. Otherwise a person would have to use the plain old
$hostname = $_SERVER["REMOTE_ADDR"];

Yay for random code testing :p