MAC based auth

[Hegedus Gabor]

Hi,
read manuals but i don't know how can i  use  mac  based authentication.

I used eap-tls and username/pass. It worked good.
but when I not log on to the Windows server, I want to authenticate the 
computer, cos my server services have to reachable.

pc try authenticate using name like host/PCNAME  but i don't know what 
is a password...

I think if i use mac address based auth., i don't need username/pass, 
simply enough a mac address.

or is it a wrong idea?

how can i set it to use just mac addresses to authentication?I want 
authenticate the hardware not the user(cos the user is not logged on).

configuration: newest freeRadius, cisco switch, win xp

thanks GH