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The NTP pool is a dynamic collection of networked computers that volunteer to provide highly accurate time via the Network Time Protocol to clients worldwide. The machines that are "in the pool" are part of the pool.ntp.org domain as well as of several subdomains divided by geographical zone and are distributed to NTP clients via round-robin DNS .
This implementation is used by Google (both internally and on their public NTP servers), Amazon AWS, [68] and Facebook. [69] chrony supports leap smear in smoothtime and leapsecmode configurations, but such use is not to be mixed with a public NTP pool as leap smear is non-standard and will throw off client calculation in a mix. [70]
All a dedicated time server does is provide accurate time. An existing network server (e.g. a file server) can become a time server with additional software. The NTP homepage provides a free and widely used reference implementation of the NTP server and client for many popular operating systems. The other choice is a dedicated time server device.
UTC (variant depends on server's time source) ClockWatch Pro for Windows [22] Time Protocol Network Time Protocol: pool.ntp.org: Computer with NTP client that syncs at least once an hour. ntpd, sntp, ntpdate: Meinberg NTP [23] NetTime [24] ToyNTP [16] BktTimeSync by IZ2BKT [17] NTPSec Precision Time Protocol: Domain Time II [25] NIST Telephone ...
Open Time Server : 1GbE, Rubidium IEEE 1588 PTP, NTP, SyncE, PPS GNSS grandmaster clock from Timebeat.app [72] Open Time Server : 10/25GbE, Rubidium IEEE 1588 PTP, NTP, SyncE, PPS GNSS grandmaster clock from Timebeat.app [73] Open Timecard : PCIe card OCXO IEEE 1588 PTP, NTP, SyncE, PPS GNSS grandmaster clock from Timebeat.app [74]
Due to excessive bandwidth usage, averaging upwards of 20 GB / day, it has become necessary to direct external usage to public time server pools, such as ch.pool.ntp.org. Misuse, caused mostly by IT-providers synchronizing their client infrastructures, has made unusually high demands on network traffic, thereby causing ETH to take effective ...
It is an alternative to ntpd, a reference implementation of NTP. It runs on Unix-like operating systems (including Linux and macOS) and is released under the GNU GPL v2. [4] It is the default NTP client and server in Red Hat Enterprise Linux 8 and SUSE Linux Enterprise Server 15, [5] [6] and available in many Linux distributions. [7] [8] [9]
A host connects to a server that supports the Time Protocol on port 37. The server then sends the time as a 32-bit unsigned integer in binary format and in network byte order, representing the number of seconds since 00:00 (midnight) 1 January, 1900 GMT, and closes the connection. Operation over UDP requires the sending of any datagram to the ...