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diff -u old/ntp.conf new/ntp.conf
--- old/ntp.conf 2016-12-20 15:41:04.992738081 -0600
+++ new/ntp.conf 2016-12-20 16:07:40.632709506 -0600
@@ -1,7 +1,19 @@
-# This is the most basic ntp configuration file
# The driftfile must remain in a place specific to this
# machine - it records the machine specific clock error
driftfile /etc/ntp.drift
+
+# The following code is for evaluating the timeserver.
+# Remove the # to activate the statistics
+# statistics loopstats
+# statistics peerstats
+# statsdir /var/log/ntpstats
+# filegen peerstats file peerstats type day link enable
+# filegen loopstats file loopstats type day link enable
+
+# This is the US timeserver pool. You should use a pool
+# close to your location.
+#pool us.pool.ntp.org iburst
+
# This should be a server that is close (in IP terms)
# to the machine. Add other servers as required.
# Unless you un-comment the line below ntpd will sync
@@ -9,8 +21,26 @@
#
# server time.server.example.com
#
+
+logfile /var/log/ntp.log
+
+restrict default kod nomodify notrap nopeer noquery
+restrict -6 default kod nomodify notrap nopeer noquery
+restrict 127.0.0.1 mask 255.255.255.0
+restrict -6 ::1
+
+# GPS Serial data reference (NTP0)
+server 127.127.28.0
+fudge 127.127.28.0 time1 0.080 refid GPS
+
+# GPS PPS reference (NTP2)
+server 127.127.28.2 prefer
+fudge 127.127.28.2 time1 0.000 refid PPS
+
# Using local hardware clock as fallback
# Disable this when using ntpd -q -g -x as ntpdate or it will sync to itself
+# The stratum should be a high value so this does not get chosen
+# except in dire circumstances.
server 127.127.1.0
fudge 127.127.1.0 stratum 14
# Defining a default security setting
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