# /etc/ntp.conf, configuration for ntpd

# Prohibit general access to this service
restrict default ignore

# Permit all access over the loopback interface
restrict 127.0.0.1

# --- CLIENT NETWORK -----
# Permit systems on this network to syncronize with this
# time service. Do not permit those systems to modify the
# configuration of this service. Also, do not use those
# systems as peers for synchronization
restrict 192.168.1.0  mask  255.255.255.0 notrust nomodify notrap

# --- TIMESERVERS ----- 
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
#restrict mytrustedtimeserverip mask 255.255.255.255 nomodify notrap noquery
#server mytrustedtimeserverip

restrict time.apple.com mask 255.255.255.255 nomodify notrap noquery
server time.apple.com   # A stratum 2 server at apple.com

# pool.ntp.org maps to more than 100 low-stratum NTP servers.
# Your server will pick a different set every time it starts up.
# *** Please consider joining the pool! ***
# ***  <http://www.pool.ntp.org/#join>  ***
server us.pool.ntp.org
server us.pool.ntp.org    # uncomment for extra reliability

# --- NTP MULTICASTCLIENT ---
#multicastclient # listen on default 224.0.1.1
# restrict 224.0.1.1 mask 255.255.255.255 notrust nomodify notrap

#--- GENERAL CONFIGURATION ---
#
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available. The
# default stratum is usually 3, but in this case we elect to use stratum
# 0. Since the server line does not have the prefer keyword, this driver
# is never used for synchronization, unless no other other
# synchronization source is available. In case the local host is
# controlled by some external source, such as an external oscillator or
# another protocol, the prefer keyword would cause the local host to
# disregard all other synchronization sources, unless the kernel
# modifications are in use and declare an unsynchronized condition.
#
server 127.127.1.1
fudge 127.127.1.0 stratum 10 

#
# Drift file. Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
#
driftfile /var/lib/ntp/ntp.drift

#
# Allow ntpd to log events
# ntpd will use syslog() if logfile is not defined
logfile /var/log/ntpd

#
# Stat Tracking Set up
statsdir /var/log/ntpstats/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

#
# Authentication delay. If you use, or plan to use someday, the
# authentication facility you should make the programs in the auth_stuff
# directory and figure out what this number should be on your machine.
#
#authenticate yes

#
# Keys file. If you want to diddle your server at run time, make a
# keys file (mode 600 for sure) and define the key number to be
# used for making requests.
#
# PLEASE DO NOT USE THE DEFAULT VALUES HERE. Pick your own, or remote
# systems might be able to reset your clock at will. Note also that
# ntpd is started with a -A flag, disabling authentication, that
# will have to be removed as well.
#
#keys /etc/ntp/keys