NTP Service - NTP Subnet
Host: time3.hs-augsburg.de remote refid st t when poll reach delay offset jitter ============================================================================== LOCAL(1) .LOCL. 5 s 558d 64 0 0.000 +0.000 0.000 -time1.hs-augsbu 126.96.36.199 2 s 266 1024 376 0.555 -0.548 0.040 -time2.hs-augsbu 188.8.131.52 2 s 445 1024 376 0.736 -0.718 0.052 *ntp2.rrze.uni-e .MBGh. 1 u 218 1024 377 5.883 -0.613 0.664 +ptbtime3.ptb.de .PTB. 1 u 17 1024 377 16.076 -0.786 0.198 +ntp1.tik.uni-st .MBG. 1 u 908 1024 377 9.163 +1.340 0.850 Retrieved 2023-12-11 23:32:53 CET
This billboard shows the status of configured peers and possibly other clients poking the xntpd daemon.
The host addresses shown in the remote column should agree with the DNS entries in the configuration file, plus any peers not mentioned in the file at the same or lower than our stratum that happen to be configured to peer with us.
The refid entry shows the current source of synchronization for each peer, while the st reveals its stratum and the poll entry the polling interval, in seconds. The when entry shows the time since the peer was last heard, normally in seconds, while the reach entry shows the status of the reachability register (see RFC-1305), which is in octal format.
The remaining entries show the latest delay, offset (difference between the time of the peer and the local clock, zero for local) and dispersion (maximum error of local to reference clock) computed for the peer, in milliseconds.
The tattletale character at the left margin displays the synchronization status of each peer. The currently selected peer is marked *, while additional peers designated acceptable for synchronization, but not currently selected, are marked +. Peers marked * and + are included in a weighted average computation to set the local clock; the data produced by peers marked with other symbols are discarded. See the ntpq documentation for the meaning of these symbols.
(Quoted from NTP Debugging Techniques.)
A line with
refidcolumn is about the internal clock. Its offset is zero because it is the reference for the other ones. A line with
remotecolumn and with
refidcolumn would be about a GPS receiver. A line with
remotecolumn and with
refidcolumn would be about a DCF77 receiver. The rest are the local and remote NTP servers we compare with.
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