Linux tcpdump and ngrep
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Common examples of tcpdump
Usage of expressions and | or with subnets
tcpdump -qn -i any -p -e "(dst port 9443 or dst port 22 or dst port 8672) \ and (src net 10.34.96.128/25 or src net 10.34.97.128/25 or net 10.34.98.128/25)" tcpdump -qn -i any -p -e "dst port 22 \ and (src net 10.34.96.128/25 or src net 10.34.97.128/25 or net 10.34.98.128/25)" # -q less verbose, -n no-dns, -p? -e expression