Using PTP as a Time Source for NTP

You can make the PTP-adjusted system time on an NTP server available to NTP clients.
  1. Include the following entries in the /etc/chrony.conf file on the NTP server: 
    server    127.127.1.0
fudge     127.127.1.0 stratum 0

    These entries define the local system clock as the time reference.

    Note:

    Don't configure any added server lines in the file.