I'm looking for a solution to add a 'free' realm to my conf. The object is to always send an access-accept if freeradius receives a request from a NAS with username e.g. 'free/nonexistinguser/password'

Is this possible with freeradius?

thanks and have a nice week-end, Bart

Sure. Read the users manpage (man 5 users) and the comments in the users file. Here are some hints. DEFAULT Realm == "somerealm", Auth-Type := Accept or DEFAULT User-Name =~ "^[^@]@somedomain$", Auth-Type := Accept or someusername Auth-Type := Accept etc...