NTP Configuration file.

NTP Configuration,
vi /etc/ntp.conf
restrict default nomodify notrap noquery
restrict 127.0.0.1
server (NTP Server IP/Name)
fudge 127.127.1.0 stratum 10
driftfile /var/lib/ntp/drift
broadcastdelay 0.008
authenticate yes
restrict (NTP Server IP/Name) mask 255.255.255.255 nomodify notrap noquerykeys /etc/ntp/keys