Sniffing for Packets
# 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