The only other option left is to use CoA. However, the radius client libraries that would form part of the NAS do not implement CoA. I have read up the source code of all radius client libraries offered part of FR and even made by others - none of them have a library which could be used to listen for radius packets on a given port and accept and acknowledge CoA/Packet of disconnect. So I would have to write this from scratch, and would be most happy to contribute back to community.
But in all other world, CoA is a standart, that is used for purposes that you described.
-- With best regards, Evgeniy Kozhuhovskiy Leader of Services group, MGTS, RUE Beltelecom - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
