Wireshark-users: [Wireshark-users] Merging files duplicate acks & retransmissions

From: "Keith French" <keithfrench@xxxxxxxxxxxxx>
Date: Wed, 26 May 2010 15:32:53 +0100
I have two capture taken on two laptops at either end of a client/server scenario. I want to merge them to use later with the new compare feature on Wireshark's Statistics menu. Neither trace has any TCP analysis flags set, other than a few window size updates & 1 retransmission.
 
However, when I merge them with Mergecap chronologically, I end up with about 400 TCP window size updates, duplicate acks & retransmissions etc.
 
I have tried this on several different trace scenarios and get similar results. Why doe this happen?
 
Keith French.