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i would like to know how wireshark is calculating rtt? is it cosidering delayed ack's, piggybacked acks and retransmitted packets.If it is not considered how do i incoorporate/filter these in calcuting rtt

asked 07 Jun '13, 00:49

SThomas's gravatar image

SThomas
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converted 07 Jun '13, 01:48

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grahamb ♦
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The Wireshark initial Round Trip Time (iRTT) value is calculated when the first two packets of a TCP handshake are seen {SYN, SYN/ACK}. This value will remain the same for the entire TCP conversation. {tcp.analysis.initial_rtt}

When you graph RTT in an IO graph, latency times are depicted between a data packet and the subsequent acknowledgment packet.

You can always do your own handshake analysis and filter on {tcp.flags.syn==1} to find the start of the conversation and then set time deltas to calculate individual session RTTs.

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answered 08 Nov '16, 09:57

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BruteForce
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It takes the send time (ack) - send time (packet, that is, tcp)

k?

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answered 07 Nov '16, 09:58

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Josh123456789
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question asked: 07 Jun '13, 00:49

question was seen: 16,384 times

last updated: 08 Nov '16, 09:57

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