Tcpdump cheat sheet

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 && port 1234

 

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