How to get the real IP address

Due to server changes, the method we used to obtain the ip address of the user (remote_addr) no longer works since it obtains a specific IP address that is not the user. For our web logs we were able to make changes to our web server to use this "headers.x-client-ip" to obtain the correct IP address. Is there anything in Coldfusion or in the administrator that can do this as well?