[Zope] How to get Client IP adres with Zope behind Apachr

Hello, I'm running Zope (2.7.0) behind Apache (2.0.50). I'm trying to get the client ip adres but I always get 127.0.0.1.... That's logical because Apache runs on the same server. How can I get the real users IP adres ? Thanks for your help...... Martin Koekenberg