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Dropped Packet Statistics

The Dropped Packet Statistics test checks PCAPNG Interface Statistics Blocks for reported packet drops.

What It Checks​

  • isb_ifdrop interface drop counters
  • isb_osdrop operating-system drop counters
  • cumulative drop totals reported for the selected capture interface

The test is applicable to PCAPNG captures that include Interface Statistics Blocks. Classic .pcap files and PCAPNG files without these counters are treated as not applicable.

Passing Condition​

The test passes when no reported drop counter is greater than zero.

Failure Condition​

The test fails when one or more PCAPNG statistics samples report dropped packets.

Chart​

When no drops are reported, the chart area is replaced by a pass-state summary instead of plotting a red zero-value point.

Passing Dropped Packet Statistics chart showing a no-drop pass state with one PCAPNG statistic sample

When drops are reported, the chart plots the cumulative reported dropped packets over capture time. A non-zero point means the capture source reported loss at or before that statistics sample.

Failing Dropped Packet Statistics chart showing reported dropped packets increasing over capture time

Compare failures with Capture Gap Detection, Capture Inter-arrival Jitter, and MPEG-TS Continuity Counter results to determine whether reported capture drops also appear in the transport stream.