Operator Management
The server access mode is fixed to Round-Robin (Direct cannot be configured for operator management). A health-check function is available for operator management, which can optionally be disabled. The health-check polls the server once every 10 seconds with an improbable username. If the server does not respond to this health-check, it will be marked down.
If the first server in the list cannot find a user, the next server in the RADIUS server list is not queried and access is denied. If multiple RADIUS servers are used, it is assumed they all have the same user database.
RADIUS Authentication
If the first server in the list cannot find a user, the next server in the RADIUS server list is not queried and access is denied. If multiple RADIUS servers are used, it is assumed they all have the same user database.
RADIUS Accounting
The RADIUS accounting application will try to send all the concerned packets of a subscriber host to the same server. If that server is down, then the packet is sent to the next server and, from that moment on, the RADIUS application uses that server to send its packets for that subscriber host.
RADIUS PE-Discovery
If the first server in the list cannot find a user, the next server in the RADIUS server list is not queried and access is denied. If multiple RADIUS servers are used, it is assumed they all have the same user database.
The RADIUS PE-discovery application makes use of a 10 second time period instead of the generic 30 seconds and uses a fixed consecutive timeout value of 2 (see Server reachability detection).
As long as the Session-Timeout (attribute in the RADIUS user file) is specified, it is used for the polling interval. Otherwise, the configured polling interval will be used (60 seconds by default).