Ping known servers for RTT estimates > ping -c5 mx.chi.playboy.com PING mx.chi.playboy.com (216.163.143.4) 56(84) bytes of data. --- mx.chi.playboy.com ping statistics --- 5 packets transmitted, 0 received, 100% packet loss, time 4000ms > ping -c5 mx.la.playboy.com PING mx.la.playboy.com (216.163.128.15) 56(84) bytes of data. --- mx.la.playboy.com ping statistics --- 5 packets transmitted, 0 received, 100% packet loss, time 4011ms