> It might be in the future. dynamic-clients virtual server works just with > Packet-Src-IP-Address now. There are plans to make NAS-Identifier > available to it as well. You will be able to set different shared > secrets then.
I'm waiting for such NAS-ID exactly and hope it might be based on the SSID of the AP. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html

