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Can the time column represent the transmission time?

asked 2021-09-12 04:16:04 +0000

WNuz gravatar image

I have a packet capture and I am trying to find the transmission time for each captured packet. Transmission time is defined as: the total time the frame takes to transmit data

I have a column called time and I can edit the view of the column from the time display format in the menu bar. I have the "Seconds since beginning of capture selected in Microseconds".

The time column looks like this: Time 0.000000 0.075057 0.089551 0.093888 0.110380 0.110447 0.126355

1- My first question is, does the time column represent the transmission time for each packet ?

2- If not, how do I find the transmission time?

Thanks

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Transmission time is defined as: the total time the frame takes to transmit data

By that do you mean the difference between the time at which the first part of the packet is put on the network and the time at which the last part of the packet is put on the network, rather than the time at which the first part of the packet is put on the network or the time at which the last part of the packet is put on the network?

Guy Harris gravatar imageGuy Harris ( 2021-09-13 05:46:50 +0000 )edit

Umm I meant the time it takes one entire packet to be delivered from source to destination. So yeah I guess how you wrote it is the same: "the difference between the time at which the first part of the packet is put on the network and the time at which the last part of the packet is put on the network".

Do you think there is a way to calculate this on Wireshark? Or do I actually need external hardware to capture this?

WNuz gravatar imageWNuz ( 2021-09-14 01:25:10 +0000 )edit

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answered 2021-09-12 10:47:10 +0000

grahamb gravatar image

No, the time column represents the time at which the capturing mechanism recorded the packet being transmitted (or received) and is not related to the actual transmission time of the packet of the wire.

To obtain the transmission time I suspect you would need external hardware, i.e. a tap that would be able to capture and record the required information using hardware timestamping.

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Asked: 2021-09-12 04:16:04 +0000

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Last updated: Sep 12