How the freeradius-server can get username/password from Win2k-Se rver ?

[Schuster Christian]

Hi @ all,
I'm a freeradius newbie and try that the freeradius(version 1.0.2) get their
users (and passwords) by domain from the active directory. I googled a lot
and found differend ways for this. (ntlm, pam-module).
 
Which of these ways is the securest way? 
Are their any other possibilities?
Are their any manuals/helps therefore or can someone discribe me how to
implement this?
 
thx
 
schustn