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How to identify if packet drops are seen

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ontap-9
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nas
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Applies to

TCP

Answer

  • When inspecting a packet trace, packet loss is usually identified by multiple duplicate acknowledgements (at least #1, #2, and #3) along with retransmissions
  • The following filter in Wireshark can help you identify packets related to packet loss:
    • tcp.analysis.duplicate_ack || tcp.analysis.retransmission || tcp.analysis.fast_retransmission || tcp.analysis.out_of_order
  • Collect simultaneous packet traces from ONTAP and client in order to check packet drops. 

Additional Information

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