I've worked with ISPs setting up RADIUS so that, and Debian, are really the only parts I understand here. So I interpret this as a system that needs to run in

I've worked with ISPs setting up RADIUS so that, and Debian, are really the only parts I understand here. So I interpret this as a system that needs to run in full co-operation with the ISP or the owner of the fiber cables. Since that is usually who is managing the RADIUS setup.