Monitoring RADIUS Messages

When Monitoring Agent is intercepting RADIUS accounting messages, it captures every UDP packet that is sent to the RADIUS accounting port (1813 is the default port).

Monitoring Agent processes messages for the following RADIUS attributes:

• Acct-Status-Type (RADIUS attribute [40])—Start and interim update events are translated into ipUp events. Stop events are translated into ipDown events.
• Framed-Ip-Address (RADIUS attribute [8])—The IP address identifies the notified interface.
• Acct-Session-Id (RADIUS attribute [44])—The accounting session ID is set as the EA_SESSION_ID attribute of the event notification.
• NAS-Port-Id (RADIUS attribute [87])—If present, the NAS port ID is set as the EA_NAS_PORT_ID attribute of the event notification.

The RADIUS client must send interim update accounting requests with a known frequency because the Monitoring Agent application cannot keep the state of logged subscriber sessions. To allow for lost messages, you might set the timeout value for ipUp notifications to a value that is larger than the interim update interval. For example, setting the timeout value to twice the interim update interval allows for one lost message.

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