May 2017
Beginner
552 pages
28h 47m
English
Content preview from Linux Shell Scripting Cookbook - Third Edition
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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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