root@test1:~# ping -c4 smtp.mail.ru
PING smtp.mail.ru (217.69.139.160) 56(84) bytes of data.
64 bytes from smtp.mail.ru (217.69.139.160): icmp_seq=1 ttl=56 time=2.29 ms
64 bytes from smtp.mail.ru (217.69.139.160): icmp_seq=2 ttl=56 time=1.91 ms
64 bytes from smtp.mail.ru (217.69.139.160): icmp_seq=3 ttl=56 time=2.00 ms
64 bytes from smtp.mail.ru (217.69.139.160): icmp_seq=4 ttl=56 time=2.30 ms
--- smtp.mail.ru ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 1.916/2.130/2.308/0.180 ms