user from particular NAS-IP-Address

I'm trying to restrict a guest user from a single NAS-IP-Address via "users" and I can't get it to work. Doesn't work: test NAS-IP-Address == "127.0.0.1" Auth-Type := Accept test NAS-IP-Address == "127.0.1.1" Auth-Type := Accept Works, but it isn't restricted by NAS: test Auth-Type := Accept I've also tried "Calling-Station-ID == 127.0.1.1" to no avail. Also, how would I do this for a group of NAS IP addresses? Is it possible to assign them to a group in "clients.conf" that can be later checked against in "users"? Where is the documentation of what can be tested against in the "users" file?