Yes. You could do it simply with users file, use unlang in post-auth or add it to LDAP as 3 places to start with (just one way is enough!) And you'll need to ensure tour NAS kit follow/honours the value you provide. If you are proxying a la eduroam then the remote site providing the service will decide what to do. They may honour your value, they may filter it out or they may override it with their chosen value alan -- This smartphone uses free WiFi around the world with eduroam, now that's what I call smart.