In general, the NAS will only send an Accounting-Start once the session is up. That said however, we have seen strange NAS gear that behave differently, but its quite rare.
FWIW: I've seen this behavior on Comware based network gear (3Com/H3C/HP) and on a Huawei Quidway switch. In all cases, the device could also be configured to allow access based on Access-Accept alone, so without waiting for confirmation of the Accounting-Start. I believe it was a statement like "accounting optional".
Regards, Jeroen van Ingen ICT Service Centre University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands _______________________________________________ radiator mailing list email@example.com http://lists.open.com.au/mailman/listinfo/radiator