> What should be the IP/Host of the NAS in nas database if the NAS in > other location in internet and NAS IP is dynamic based on their ISP? > > 0.0.0.0 ?
No. Subnet from which IPs are allocated. Ivan Kalik Kalik Informatika ISP - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html

