server timex.cs.columbia.edu
server sundial.columbia.edu
# replace with local servers!
# http://www.eecis.udel.edu/~mills/ntp/clock2a.html

driftfile /var/db/ntp.drift

# restrict local-network mask 255.255.255.252 notrust nomodify notrap
# change "local-network" to your network address and uncomment