# tcpdump -i any# tcpdump -i eth0 tcp port 80# tcpdump -i eth0 tcp port 80 or 443# tcpdump -i eth0 icmp# tcpdump -i eth0 icmp6# tcpdump -i any# tcpdump -i eth0 tcp port 80# tcpdump -i eth0 tcp port 80 or 443# tcpdump -i eth0 icmp# tcpdump -i eth0 icmp6