prevent roaming configuration question

[isidoros]

Hello everybody,

I have a configuration question. How would I have to set up the 
following configuration

NAS1 with users X,Y,Z
NAS2 with users A,B,C

one central radius server

Goal:
users X,Y,Z should only be authenticated on NAS1 and not on NAS2 or any 
other nas
users A,B,C should only be authenticated on NAS2 and not on NAS1 or any 
other nas
etc

My best guess would be tho tweak the auth_query in the sql.conf

any idea's

thanks