I need to set up a radius server at a remote site for a VPN box.  The users
need to authenticate against their NT domain.  I don't have access to any of
the NT boxes, but I do have access to a linux box with Samba on it.  If I
set up the Samba box as a backup domain controller (I can get the NT admin
there to make it a backup DC for me), is it possible to run a RADIUS server
on it that will authenticate against the domain?

How would I go about this?  

Jay