Issue with RTT values in Wireshark

[NITIN GOYAL <nitinkumgoyal () gmail com>]

Hi All

I have an issue with the Wireshark for calcuating the RTT values. For few
pcaps, I have a higher value of RTT on one side or direction but the lower
value of RTT on other side.
I have taken the trace in the middle of the connections and in one
direction the RTT calculated by Wireshark is around 40 ms but on what other
direction its 1.5 ms.

But i think ideally both the sides should have the same values as its round
trip time(like a loop).

The trace is RTP over UDP over a VoIP tool.

Now, when i use some other licensed tool based on libpacp used by Wireshark
as well, the values for both the sides is almost same with the same pcap
file.

So, i am not sure if Wireshark is calculating the wrong RTT values or the
interpreation is differnet by other tools as how to calcuate the RTT
vlaues??

Any idea about this??

Regards
Nitin

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