What is the difference between ntpd and ntpdate?

What is the difference between ntpd and ntpdate?

ntpdate synchronizes the clock with an NTP server one time whereas ntp starts and stops the Network Time Protocol Daemon (ntpd) service, and the ntpd keeps Director’s clock in synchronization constantly.

What is NTP and chrony?

chrony is an implementation of the Network Time Protocol (NTP). It’s a replacement for the ntpd, which is a reference implementation of the NTP. It runs on Unix-like operating systems (including Linux and macOS) and is released under the GNU GPL v2.

Does ntpd use ntpdate?

The ntpd program is a separate package on Ubuntu® operating systems and Debian®. The other distributions install ntpdate at the time of ntpd installation. To use ntpdate , Ubuntu operating system and Debian users must first install it.

What is OpenNTPD?

OpenNTPD is a FREE, easy-to-use implementation of the Network Time Protocol. It provides the ability to sync the local clock to remote NTP servers and can act as NTP server itself, redistributing the local clock. OpenNTPD was primarily developed by Henning Brauer as part of the OpenBSD Project and gets released as…

What is OpenBSD NTP daemon?

OpenNTPD (also known as OpenBSD NTP Daemon) is a Unix daemon implementing the Network Time Protocol to synchronize the local clock of a computer system with remote NTP servers. It is also able to act as an NTP server to NTP-compatible clients.

How accurate are the NTP clients?

This is a comparison of accuracies that can be achieved when the NTP implementations are used as NTP clients in various clock and network conditions. The accuracy of the synchronized clock was measured in a simulated Linux environment. The results are mean values and standard deviations from 100 simulations. The values are in microseconds.

Is it safe to use NTP broadcast mode?

However, the broadcast and multicast modes are inherently less accurate and less secure (even with authentication) than the ordinary server/client mode, and should generally be avoided. ntp supports the Autokey protocol (RFC 5906) to authenticate servers with public-key cryptography.