Tcpdump cheat sheet
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Display packets from A.B.C.D on interface eth0, no name resolution
tcpdump -i eth0 -s 0 -nnn host A.B.C.D
Save packets to tracefile <filename> on interface eth0 with exclusion of ssh
tcpdump -i eth0 -s 0 -w <filename> port not 22
Save icmp packets to tracefile <filename> on interface eth0
tcpdump -i eth0 -s 0 -w <filename> icmp
Packets from host A.B.C.D on port 1234
tcpdump -i eth0 -s 0 host A.B.C.D and port 1234
Packets from host A.B.C.D on port 1234 and ASCII decode on screen
tcpdump -i eth0 -s 0 host A.B.C.D and port 1234 -A
Packets from multiple host
tcpdump -i eth0 -s 0 host 1.2.3.4 or host 5.6.7.8 or ...
Packets on port 1234 for 10 minutes
Read: dump tracefile <filename> once after 600 seconds
tcpdump -i eth0 -s 0 -G 600 -W 1 -w <filename> port 1234
Stop
<Ctrl>-C