Tuesday, June 3, 2014

ntpq -p output explained

ntpq -p
remote refid st t when poll reach delay offset jitter
LOCAL(0) .LOCL. 10 l 23 64 1 0.000 0.000 0.001
erman.prt 5 u 22 64 1 0.116 8.789 0.001
  • The asterisk(*): prefered time server(ntp will first to try to get the time).
  • remote: the address of the time server, with LOCAL(0) indicating the local clock.
  • refid: type of the time server. LOCAL or .LCL. means local, .DCFa. is a DCF77 receiver, .PPS. is a hardware device generating a pulse every second.
  • st: the Stratum, which indicates the accuracy to be expected. Stratum 0 are usually atomic clocks, Stratum 1 might be radio controlled clocks.
  • when: next update time.
  • poll: the count that when has to reach before an update is attempted
  • reach: octal number that is left-shifted on each update. On a successful update an 1 is shifted in, 0 otherwise.
  • delay: RTT to the time server
  • offset: the difference between the remote and the local clock

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