$ tcpdump -D
-> Display all available interfaces for tcpdump
$ tcpdump -i 1 | more
-> Listen (interface 1) with more command
$ tcpdump -i any
-> Listen all actived interfaces
$ tcpdump -i eth1
-> Listen eth1 interface
$ tcpdump -i eth0 port 22
-> Listen eth0 interface on port 22
$ tcpdump -i eth2 port 23 -w example.pcap
-> Listen eth2 interface on port 23 and save as desired file name
-> Display all available interfaces for tcpdump
$ tcpdump -i 1 | more
-> Listen (interface 1) with more command
$ tcpdump -i any
-> Listen all actived interfaces
$ tcpdump -i eth1
-> Listen eth1 interface
$ tcpdump -i eth0 port 22
-> Listen eth0 interface on port 22
$ tcpdump -i eth2 port 23 -w example.pcap
-> Listen eth2 interface on port 23 and save as desired file name