/etc/ntp.conf
# Some nearby ntp pool servers server nl.pool.ntp.org server be.pool.ntp.org server de.pool.ntp.org server uk.pool.ntp.org # My extra servers server ntp.xs4all.nl iburst server ntp.bit.nl iburst server 172.31.1.1 iburst # Peers in LAN peer 172.31.1.X # One server in the LAN needs to be a "fudge" server fudge 127.127.1.0 stratum 9 server 127.127.1.0