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Howto :: Sniffing plain text usernames and password credentials using TCPDUMP linux command line tool
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Simple plaintext credentials sniffing with tcpdump and grep
tcpdump port http or port ftp or port smtp or port imap or port pop3 -l -A | egrep -i 'pass=|pwd=|log=|login=|user=|username=|pw=|passw=|passwd=|password=|pass:|user:|username:|password:|login:|pass |user ' --color=auto --line-buffered -B20
Other useful tcpdump command:
Show network throughput
tcpdump -w - |pv -bert >/dev/null
See what traffic is mostly hitting you
tcpdump -i eth0 -n | head
Get useful statistics from a previously recorded tcpdump output (file) -> Sorted by IP
tcpdump -nr capture.file | awk '{print }' | grep -oE '[0-9]{1,}.[0-9]{1,}.[0-9]{1,}.[0-9]{1,}' | sort | uniq -c | sort -n