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TCPDump

Display a pcap file

tcpdump -r passwordz.pcap

Display ips and filter and sort

tcpdump -n -r passwordz.pcap | awk -F" " '{print $3}' | sort -u | head

Grab a packet capture on port 80

tcpdump tcp port 80 -w output.pcap -i eth0

Check for ACK or PSH flag set in a TCP packet

tcpdump -A -n 'tcp[13] = 24' -r passwordz.pcap