What does NTP offset mean?
Offset: Offset generally refers to the difference in time between an external timing reference and time on a local machine. The greater the offset, the more inaccurate the timing source is. Synchronised NTP servers will generally have a low offset. Offset is generally measured in milliseconds.
What causes NTP drift?
Certain CPU-intensive applications (trading applications in particular) will cause “clock drift” on Windows systems. This is caused by Windows using SNTP (Simplified Network Time Protocol) rather than a full NTP service; as well as Windows having a too-infrequent clock update cycle by default.
What is drift file in NTP?
The driftfile entry in /etc/ntp. conf tells ntpd the name of the file where it can find and store the clock drift, also known as frequency error, of the system clock. If the file exists at startup, it is read and the value is used to initialize ntpd’s internal value of the frequency error.
How accurate is NTP?
NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions. Asymmetric routes and network congestion can cause errors of 100 ms or more.
How often should NTP sync?
2 Answers. Generally we can also call it as polling interval and minimum time is 64 sec and maximum time 1024 sec , but you can still change it as you want by doing changes at /etc/ntp. conf . These options specify the minimum and maximum poll intervals for NTP messages, in seconds as a power of two.
How do I resync my domain controller time?
- Make sure that the Windows Time service is set to Automatic and that it is running.
- To sync the time with the domain controller, run the following commands in an administrative command window: w32tm /resync. net time \\DC /set. Where DC is the full domain name of the domain controller.
How do I know if NTP is synchronized?
The ntpstat command will report the synchronisation state of the NTP daemon running on the local machine….exit status of ntpstat command
- If exit status 0 – Clock is synchronised.
- exit status 1 – Clock is not synchronised.
- exit status 2 – If clock state is indeterminant, for example if ntpd is not contactable.