I have a dissector whose protocol is under TCP/IP. When I identify a packet, I 
would like to find the frame that is the ACK for my PSH,ACK packet. My goal is 
to find the abs_tm value of the ACK packet and use that as a starting time of 
host processing, instead of using the abs_tm of my packet, since that would 
include the network latency.

While dissecting, the tcpinfo data has lastackseq, but not a frame number. 
There is a tcp_acked structure, but I don't know how to locate it. The ACK 
frame's SEQ Analysis says what frame it is ACKing, but the SEQ Analysis of my 
frame doesn't point to the ACK. And I can't create a dissector to look for it 
because the ACK frame has no TCP payload, so it won't call a dissector.

Is there some way I can locate the ACK frame of a packet and look at its abs_tm 
value?

Thank you,
Jay Turner

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