restricting users access to clients?

Hi, We're using FreeRadius to authenticating our wireless users (who's credentials are stored in LDAP). But we'd also like to use it to authenticate a select few users who need access to our networking gear. Our networking gear is setup to do this, but I'm not sure how to set this up in FreeRadius. I would assume that you'd specify in the clients.conf section which users are allowed access to that device, but in looking at the documentation for clients.conf, that doesn't seem to be the case. Any links/advice is appreciated. Thanks Matt mda@unb.ca