Having seen the amount of tables and properties in the sql module, I assumed it would be both overkill and too complicated to set up for my quite simple usage scenario. But maybe I am mistaken and it is as easy as giving freeradius the credentials and putting the usernames & passwords in a single table? It is that simple really. You won't need all the tables that the SQL module exposes. The radcheck table does in a database format what the users file does, i.e.
+- id -+- username ---+--- attribute ------+ op +-- value ---+ | xxxx | username1 | ClearText-Password | := | password here | +------+--------------+--------------------+----+---------------+ : : I got everything working now, though it was not possible with the radcheck table only. First, I was forced to move the freeradius server from OpenWRT to another machine, because I didn't find a way to get a SQL driver running, second, freeradius refused to operate without a radreply table. In the end I applied the complete mysql template to my database, which worked out fine, though I'm now sitting on all the tables I didn't want to have in the first place. Maybe there is a way (which I have not found) to tweak the config so the radcheck table alone is sufficient?
Anyway, thanks for your help!