linuxptp - 1.9.2-1+deb10u1 main

Linuxptp is an implementation of the Precision Time Protocol (PTP)
according to IEEE standard 1588 for Linux. Features include:
- support for hardware and software time stamping via the Linux
SO_TIMESTAMPING socket option.
- support for the Linux PTP Hardware Clock (PHC) subsystem by using the
clock_gettime family of calls, including the new clock_adjtimex
system call
- implementation of Boundary Clock (BC) and Ordinary Clock (OC)
- transport over UDP/IPv4, UDP/IPv6, and raw Ethernet (Layer 2)
- support for IEEE 802.1AS-2011 in the role of end station
.
PTP provides higher precision and faster synchronization than NTP even
without hardware support. With hardware support, sub-microsecond
accuracy can be expected. Whereas NTP is intended for WAN use, PTP is
designed for LAN environments and makes use of UDP multicast.