List available interfaces
tcpdump -D
Run TCPDump on a specific interface
tcpdump -i <if>
Run TCPDump and display brut ASCII
tcpdump -A
Limit the number of captured packets
tcpdump -c <number>
Print the result in line
tcpdump -l
Read from a file
tcpdump -r <file>
Export to a file
tcpdump -w <file>