Listing 1: The sample NTP configuration file

##
#    List servers - stratum 1 servers
##
server        tick.usno.navy.mil
server        tock.usno.navy.mil
server        ntp1.sura.net
##
#    Identify peers
##
peer 10.0.0.2         key 34         # management.foo.com
peer 10.1.152.2       key 3          # writers.foo.com
peer 192.168.51.2     key 76         # timerserver.anotherdomain.com
authenticate          yes            # enable authentication
keys                  /etc/ntp.keys  # path for key file
trustedkey            34 76          # define trusted keys
##
#    Specify Drift file
##
driftfile        /etc/ntp.drift

# End of File