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clockdiff Measures clock difference between us and destination with 1 msec resolution using ICMP TIMESTAMP [2] packets or, optionally, IP TIMESTAMP option [3] option added to ICMP ECHO. [1]
wayne@X6Ti:~ clockdiff bbs.emath.ac.cn .................................................. host=bbs.emath.ac.cn rtt=62(15)ms/50ms delta=4ms/5ms Sat Jul 29 09:45:42 2017 wayne@X6Ti:~ clockdiff -o bbs.emath.ac.cn .................................................. host=bbs.emath.ac.cn rtt=355(101)ms/151ms delta=1ms/5ms Sat Jul 29 09:46:20 2017
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