How accurate is NTP time sync?
NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC). 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.
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 accurate is Network Time Protocol ( NTP )?
NTP Servers on a Local Area Network (LAN): <1ms. The accuracy to which NTP clients can synchronize their clocks to the correct time is dependent on a number of factors. At the highest levels of the timing hierarchy, the accuracy of the root time source (Stratum 0) is important.
Why is it important to Know Your NTP time synchronization?
The NTP protocol automatically provides optimal accuracy and precision with 3 or more NTP “peer” servers. Knowing that your NTP server has its timing reference, or “GPS Synch”, is key to reliability, and taking effective corrective action before timing “drifts”.
Are there any time offset errors in NTP?
However, there are still possible time offset errors due to network asymmetries. See: Assuming a time source provides accurate time, the accuray you can yield when synchronizing your system time on a specific client hardware depends mostly on the implementation of the software on the system to be synchronized.
Why do I need GPS for my NTP server?
Each NTP Server should have a GPS/GNSS Antenna that can see, and track, the signals from multiple satellites, to provide accurate, precise source of timing. GPS itself has certain vulnerabilities. An individual satellite can go out of service, for long enough to impact timing.