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When you capture these packets if you are using a tool such as Wireshark look at the look offset 0x23 and 0x24. This is the source port in a TCP header. In the middle frame of a packet capture it would look like this:
Click Image to enlarge screenshot.
In this example the source port is 2346. Source ports are typically chosen at random. If you have access to the system sending the traffic you can run a tool like fport or run netstat -an from the command line.
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