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How to log into file all udp packets (in and out) from port N in readable format (capture packet type (time stamp, name of error if one happens or message type, data size, data))?

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To capture traffic, use tcpdump(1) (it has a very extensive set of filtering options to define exactly what to capture, and can save the captured traffic to a file). To read the file, you can use the same tcpdump or the graphical wireshark(1).

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