Newbie, authenticate MAC address

[CoyoteTM]

Hello list members !   I am really newbie...   0. First off all, plz point me the best how-to available on the net, about freeradius. I want to use it with mysql.   1. Can I user the same radius server to authenticate dial-up users (from CISCO), authenticate wireless devices based on MAC address, gather VOIP accounting information (from CISCO) ? And store all this in mysql.   2. How to authenticate on MAC address ? There are no passwords, and user names. Basic concept ?   3. How accurate is this kind of accounting ? What if a "session end" message is lost. Or what is the situation if a user is always on-line ? There is some kind of timeout when accounting data is written out to databse ?