- Interface Fa0/0 is not configured as the source of the packets sent to the collector.
- The interface is shutdown.
- The Netflow collector IP address and UDP port number are not configured on the router.
- The router is not configured to monitor outgoing packets on the interface.
Explanation: NetFlow flows are unidirectional. One user connection exists as two flows. The flow in each direction must be captured. This is done by using both the ip flow ingress and ip flow egress command on the interface.
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