PING duyen.vn (123.30.50.30) 56(84) bytes of data.
64 bytes from xdo.vn (123.30.50.30): icmp_seq=1 ttl=121 time=253 ms
64 bytes from xdo.vn (123.30.50.30): icmp_seq=2 ttl=121 time=250 ms
64 bytes from xdo.vn (123.30.50.30): icmp_seq=3 ttl=121 time=250 ms

--- duyen.vn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 250.618/251.650/253.629/1.399 ms