I am starting an ISP. And need several principle advices how to arrange my network.
The problem of RADIUS accounting is it's non real-time working mode. And if I need to arrange real-time accounting and detailed reports, am I to use NetFlow? That means, that users authorize via RADIUS but their Internet traffic is still calculated by using NetFlow. I have Cisco 2651XM as a core router and NAT, and UTM billing engine with it's RADIUS server. As I see UTM supports RADIUS authorization among with NetFlow accounting.
But is there any other rational solution?