Sensor Not Seeing Packets

Appendix E Troubleshooting

Troubleshooting the Appliance

Step 4 Make sure the sensor is seeing packets.

sensor# show interfaces FastEthernet0/1

MAC statistics from interface FastEthernet0/1

Media Type = backplane

Missed Packet Percentage = 0

Inline Mode = Unpaired

Pair Status = N/A

Link Status = Up

Link Speed = Auto_100

Link Duplex = Auto_Full

Total Packets Received = 267581

Total Bytes Received = 24886471

Total Multicast Packets Received = 0

Total Broadcast Packets Received = 0

Total Jumbo Packets Received = 0

Total Undersize Packets Received = 0

Total Receive Errors = 0

Total Receive FIFO Overruns = 0 Total Packets Transmitted = 57301 Total Bytes Transmitted = 3441000 Total Multicast Packets Transmitted = 0 Total Broadcast Packets Transmitted = 0 Total Jumbo Packets Transmitted = 0 Total Undersize Packets Transmitted = 0 Total Transmit Errors = 1

Total Transmit FIFO Overruns = 0 sensor#

Step 5 Check for alerts.

sensor# show statistics virtual-sensorSigEvent Preliminary Stage Statistics Number of Alerts received = 0

Number of Alerts Consumed by AlertInterval = 0 Number of Alerts Consumed by Event Count = 0 Number of FireOnce First Alerts = 0

Number of FireOnce Intermediate Alerts = 0 Number of Summary First Alerts = 0 Number of Summary Intermediate Alerts = 0 Number of Regular Summary Final Alerts = 0 Number of Global Summary Final Alerts = 0

Number of Alerts Output for further processing = 0alertDetails: Traffic Source: int0 ;

If the sensor is not seeing any packets on the network, you could have the interfaces set up incorrectly. If the sensor is not seeing packets, follow these steps:

Step 1 Log in to the CLI.

Step 2 Make sure the interfaces are up and receiving packets.

sensor# show interfaces GigabitEthernet0/1

MAC statistics from interface GigabitEthernet0/1

Media Type = backplane

Missed Packet Percentage = 0

Inline Mode = Unpaired

	Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.1
E-32	OL-24002-01

IPS4520K9 specifications

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Cisco Systems IPS4520K9 manual Sensor Not Seeing Packets, Check for alerts

Models: IPS4520K9

sensor# show interfaces FastEthernet0/1

Total Transmit FIFO Overruns = 0 sensor#

Step 5 Check for alerts.