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Round Trip Time

The ping command displays Round Trip Time (RTT) for each packet sent and returned. RTT is reported in milliseconds. On an internal network, a RTT of under 1ms is common. When pinging a site on the Internet, RTT are commonly 10-400 ms, and may exceed 1000 ms:

--- google.com ping statistics --- 
5 packets transmitted, 5 received, 0% packet loss, time 4000ms 
rtt min/avg/max/mdev = 118.012/206.630/347.186/77.713 ms

Here, the minimum RTT is 118.012 ms, the average RTT is 206.630 ms, and the maximum RTT is 347.186ms. The mdev (77.713ms) parameter in the ping output stands for mean deviation.

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