Change pam_auth NAS-IP Address in radius reuest.

I'm using the latest freeradius on Centos 4.5. I have several Centos 4.5 clients all using pam_auth_radius and LDAP. Everything is working but I wanted to know if there is a way to change the NAS-IP-Address that is sent by the clients. They all send back 127.0.0.1. I want to them to send the real IP addess of the machine as the NAS-IP-Address. The only way I was able to make them work was to change the NAS-IP-Address in the huntgroups file to 127.0.0.1 instead of the real address. I have cisco, netscreen and packeteer devices that work just fine with the real IP's because they inject them into the request. Any help would be appreciated. Thanks, BE