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# Revision history [back]

No, the tcp.analysis.initial_rtt is a Wireshark calculated field, as indicated by how it's displayed in the packet details in [brackets], like all other Wireshark calculated/generated fields.

By the way, for a good understanding of the proper way to calculate the round trip time, I would refer you to Jasper Bongertz' blog, "Determining TCP Initial Round Trip Time".