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# Packet Loss monitor graph

This graph shows packets lost during the last second of the scenario run. Packet loss occurs when data packets fail to reach their destination. It can result from gateway overload, signal degradation, channel congestion, or faulty hardware.

Note: You cannot change the granularity of the x-axis to a value that is less than the web granularity you defined in the General tab of the Options dialog box.

Axis | Description
--- | ---
X-axis | Elapsed time since the start of the run.
Y-axis | The following measurements: The percentage of lost packets from all packets that were sent. The number of data packets that were lost over 60 seconds. The total number of packets that were lost.

For Analysis (not applicable to monitoring graphs):

To view information for a specific location:

1. Click within the graph.
2. Select Set Filter/ Sort By from the right-click menu to open the Graph Settings dialog box.
3. In the Filter condition section, select the Location Name row, and select the relevant location from the drop-down list.

When you enable Network Virtualization for a scenario, you choose the monitoring mode—per group or per load generator. The graph shows the measurements per group or load generator, based on your selection.

If you enabled Network Virtualization per group, check if the total of packet loss for a specific group increased as the scenario progressed compared with other locations. This comparison can help you determine which group experienced the most significant packet loss.

If you enabled Network Virtualization per load generator, and not per group, the graph shows packet loss per load generator machine.

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See also:

- NV monitoring

- Average Latency monitor graph

- Average Bandwidth Utilization monitor graph

- Total Throughput monitor graph

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