how to get round trip time and identify FIN-ACK and ACK pairs

[esolve esolve <esolvepolito () gmail com>]

Hi, all,

  I want to get round trip time distribution from a pcap file.  My
idea is to compute each round trip time for each pair of data packets
and ack packets. But the difficulty is to identify the pairs, namely,
for each data packet(ack packet) I need to find the corresponding ack
packet(data packet). How can I achieve this?

   Besides, for the find tcp tear-down process, how to identify each
FIN-ACK and ACK pair? thanks!
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