mac authentication

I have a working set up using wpa2 with freeradius and ldap. I need to set up host authentication instead of user authentication. I am using LAM to manage ldap and have added a couple host accounts, but I keep getting a login page from the hotspot. The problem could be a config issue on any device, but I am curious if there is a config change I need to make on freeradius to accommodate passing mac addresses to ldap rather than user credentials? (I want to use ldap for authentication instead of adding the host info to the config of freeradius.) Raymond