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Thank you very much for the answer, I considered the tcpdump filter options veeeeery complicated, therefore I chose to use easier filtering methods. I didn't use tcpdump very intensively, that's why... Just for some superficial network testing.
Then you might take a look at "ngrep" which combines tcpdump and grep into one tool. It is quite handy when you want to see only a tiny part of the network traffic identified rather by the payload and not (only) filterable by tcpdump.
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