Network Time Protocol
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Resources
The Network Time Protocol (NTP) is used to synchronize the system time with other devices over the network. This happens in a client-server model.
Implementations
Following implementations of the Network Time Protocol are currently available:
| Name | Package | Description |
|---|---|---|
| chrony | net-misc/chrony | Versatile implementation of the Network Time Protocol. |
| clockspeed | net-misc/clockspeed | Simple Network Time Protocol (NTP) client. |
| ntp | net-misc/ntp | Suite of tools utilizing Network Time Protocol. |
| ntpsec | net-misc/ntpsec | NTP reference implementation, refactored. |
| openntpd | net-misc/openntpd | Lightweight NTP server ported from OpenBSD. |
| sntpd | net-misc/sntpd | NTP (RFC-1305 and RFC-4330) client and server for unix(like) systems. |
See also
- Pi4 Stratum 1 Time Server — setting up a Raspberry Pi 4 as a Stratum 1 Time Server
- System time — is used in Unix systems to keep track of time.
External resources
- RFC 5905 - Network Time Protocol Version 4: Protocol and Algorithms Specification
- RFC 5907 - Definitions of Managed Objects for Network Time Protocol Version 4 (NTPv4)
- RFC 5908 - Network Time Protocol (NTP) Server Option for DHCPv6
- RFC 7164 - RTP and Leap Seconds
- RFC 7822 - Network Time Protocol Version 4 (NTPv4) Extension Fields
- RFC 8573 - Message Authentication Code for the Network Time Protocol
- RFC 9109 - Network Time Protocol Version 4: Port Randomization