Ntp: Difference between revisions
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* cheat sheet: http://www.meinberg.de/download/ntp/docs/ntp_cheat_sheet.pdf | * cheat sheet: http://www.meinberg.de/download/ntp/docs/ntp_cheat_sheet.pdf | ||
* monitoring tool: http://www.meinberg.de/english/sw/time-server-monitor.htm | * monitoring tool: http://www.meinberg.de/english/sw/time-server-monitor.htm | ||
== Units == | |||
1 second (s) = 1000 millisecond (ms) <br> | |||
1 millisecond (ms) = 1000 microseconds (µs) <br> | |||
1 second (s) = 1000000 microseconds (µs) <br> | |||
== secure default config == | |||
according to gcp | |||
<pre> | |||
driftfile /var/lib/ntp/ntp.drift | |||
statistics loopstats peerstats clockstats | |||
filegen loopstats file loopstats type day enable | |||
filegen peerstats file peerstats type day enable | |||
filegen clockstats file clockstats type day enable | |||
server metadata.google.internal iburst | |||
restrict -4 default kod notrap nomodify nopeer noquery limited | |||
restrict -6 default kod notrap nomodify nopeer noquery limited | |||
restrict 127.0.0.1 | |||
restrict ::1 | |||
restrict source notrap nomodify noquery | |||
</PRE> | |||
== See Also == | == See Also == | ||
* http://www.satsignal.eu/ntp/NTP-on-Windows-serial-port.html | * http://www.satsignal.eu/ntp/NTP-on-Windows-serial-port.html | ||
* all about how to use GPS device as a source in ntp: http://blog.doylenet.net/?p=145 | |||
* [[Chrony]] | |||
Latest revision as of 03:00, 13 January 2020
linux / unix
Getting an out of date server back in line.
date; ntpdate <ntpserver> ; date;
Using step tickers.
/etc/ntp/step-tickets should have the servers from the ntpd.conf config.
Some useful commands:
david@cydonia ~ $ ntpq -c pe
remote refid st t when poll reach delay offset jitter
==============================================================================
-xen0c.10mbit.bi 64.90.182.55 2 u 844 1024 377 25.870 14.653 15.800
*mircx.com 132.163.4.102 2 u 943 1024 377 61.815 6.705 2.755
+zeus.yocum.org 131.188.3.220 2 u 961 1024 377 27.989 0.981 3.108
+69.42.52.50.scr 128.100.56.135 3 u 435 1024 377 21.985 4.444 0.425
david@cydonia ~ $ ntpq -c as
ind assID status conf reach auth condition last_event cnt
===========================================================
1 764 93a4 yes yes none outlyer reachable 10
2 765 96a4 yes yes none sys.peer reachable 10
3 766 94a4 yes yes none candidat reachable 10
4 767 94a4 yes yes none candidat reachable 10
david@cydonia ~ $
windows
- http://www.meinberg.de/english/sw/ntp.htm compiled ntp.porg for windows.
- cheat sheet: http://www.meinberg.de/download/ntp/docs/ntp_cheat_sheet.pdf
- monitoring tool: http://www.meinberg.de/english/sw/time-server-monitor.htm
Units
1 second (s) = 1000 millisecond (ms)
1 millisecond (ms) = 1000 microseconds (µs)
1 second (s) = 1000000 microseconds (µs)
secure default config
according to gcp
driftfile /var/lib/ntp/ntp.drift statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable server metadata.google.internal iburst restrict -4 default kod notrap nomodify nopeer noquery limited restrict -6 default kod notrap nomodify nopeer noquery limited restrict 127.0.0.1 restrict ::1 restrict source notrap nomodify noquery
See Also
- http://www.satsignal.eu/ntp/NTP-on-Windows-serial-port.html
- all about how to use GPS device as a source in ntp: http://blog.doylenet.net/?p=145
- Chrony
