liuxg@liuxg:~$ ping localhost
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.050 ms
64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.054 ms
64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.062 ms
^C
--- localhost ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.050/0.055/0.062/0.007 ms