PING dut.edu.vn (103.57.222.134) 56(84) bytes of data.
64 bytes from 103.57.222.134 (103.57.222.134): icmp_seq=1 ttl=55 time=260 ms
64 bytes from 103.57.222.134 (103.57.222.134): icmp_seq=2 ttl=55 time=259 ms
64 bytes from 103.57.222.134 (103.57.222.134): icmp_seq=3 ttl=55 time=259 ms

--- dut.edu.vn ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 259.745/260.150/260.894/0.671 ms