Getting real IP behind a Proxy

My site is behind the cloudproxy firewall from Securi.net

Using $ip = $this->input->ip_address() does not give me the real IP of visitors or myself.  I know that using that code is supposed to give the real IP from behind proxys, but it doesnt seem to do so.

Is there a work around for this that is secure? Or am I stuck with this? I have read several threads here, and there doesnt seem to be a valid work around.

Thank you