FreeRadius2 + MySQL: NAS x Usergroup

[Carlos Eduardo Tavares Terra]

Dear freeradius users,

    I have a special scenario. Today I have many freeradius servers,
each one responsible for differente services.

   Now I want to group this freeradius servers into one master server,
but I have users in many differente usergroups (one for each service).
   How can I associate an usergroup to a nas?
   Example:
   NAS (192.168.2.1) -> Usergroup (Dialup)
   NAS (192.168.2.2) -> Usergroup (Broadband)
   NAS (192.168.2.3) -> Usergroup (Hotspot)

   I saw how to do this using huntgroups, but I want to use a mysql
database with all clients.

  There are another ways to implement this different services into one
radius server, maybe the right way? If not, how can I associate the
usergroups and nas using mysql?

Thank you
-- 
Carlos Eduardo Tavares Terra
GNU/Linux #413291 [http://counter.li.org]
Slackware Linux