Filter out the TCP stream I need in the display filter. Add columns to display: Modbus TransactionID, function code, and number of registers. I want to end with a histogram of response time, based on arbitrary criteria - say this port, or this type of request, or this packet size. Each individual request and response has a response time, so I may have 100K packets, so 50K response times. I may have a trace with one tcp connection, but the request and response is continuous. Let me clarify my question a little more with an example. Any tips, tricks, or ideas would be helpful! My solution is to export the packet data and bring into Excel and manipulate there. I know there is an option for service response times, but as luck would have it the ones I want are not there. Another could be DNS response times, or ARP response times. 
The main one is ModbusTCP, where there is a request then a response some time later.
Can anyone provide some tips on determining response time to certain protocols? For instance, I can think of several protocols where I want to detect a network request then find how long it takes to get a response.
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