How Wireshark Calculate RTT

Looking into network delays. Im plotting RTT for a TCP videostream. The graph shows spike for some packets, but i cannot find out how the RTT for these packets are calculated as i cant find the ACK for these packets.

So my question is how does wireshark calculate RTT when there apparently aren't any ACK to base the RTT caclulatation on?

Current issue: 10722: Round-Trip Time Graph plots incorrect values

Something close can be done with Statistics -> I/O Graphs plotting tcp.analysis.ack_rtt and filtering based on src/dst addresses.
(RTT time from WSUG: Figure 7.7. “TCP Analysis” packet detail items)

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Chuckc

answered 2024-04-30 17:34:55 +0000, updated 2024-04-30 17:35:38 +0000

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Thank you for answer! Just found these links, stating that my issue is a known error in Wireshark.

https://gitlab.com/wireshark/wireshar... https://osqa-ask.wireshark.org/questi...

vemund (2024-04-30 17:38:49 +0000) edit

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How Wireshark Calculate RTT edit

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