PING yan.vn (104.21.80.1) 56(84) bytes of data.
64 bytes from 104.21.80.1 (104.21.80.1): icmp_seq=1 ttl=60 time=5.63 ms
64 bytes from 104.21.80.1 (104.21.80.1): icmp_seq=2 ttl=60 time=4.10 ms
64 bytes from 104.21.80.1 (104.21.80.1): icmp_seq=3 ttl=60 time=4.05 ms

--- yan.vn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 4.059/4.597/5.630/0.734 ms