ICMP - Ping

# tcpdump -i eth0 icmp
Kernel filter, protocol ALL, datagram packet socket
tcpdump: listening on eth0
09:29:55.307166 > paris.unicamp.br > abc.unicamp.br: icmp: echo request
09:29:55.308212 < abc.unicamp.br > paris.unicamp.br: icmp: echo reply
09:29:56.300823 > paris.unicamp.br > abc.unicamp.br: icmp: echo request
09:29:56.302057 < abc.unicamp.br > paris.unicamp.br: icmp: echo reply
09:29:57.300683 > paris.unicamp.br > abc.unicamp.br: icmp: echo request
09:29:57.301930 < abc.unicamp.br > paris.unicamp.br: icmp: echo reply
09:29:58.300653 > paris.unicamp.br > abc.unicamp.br: icmp: echo request
09:29:58.301904 < abc.unicamp.br > paris.unicamp.br: icmp: echo reply

8 packets received by filter