dev:~# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
DROP       icmp --  anywhere             anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
dev:~# tcpdump -c 3 icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
01:21:31.232498 IP XXX.XX.XXX.1 > XXX.XX.XXX.2: ICMP echo request, id 21360, seq 31, length 64
01:21:32.239395 IP XXX.XX.XXX.1 > XXX.XX.XXX.2: ICMP echo request, id 21360, seq 32, length 64
01:21:33.245899 IP XXX.XX.XXX.1 > XXX.XX.XXX.2: ICMP echo request, id 21360, seq 33, length 64
3 packets captured
3 packets received by filter
0 packets dropped by kernel
dev:~#