NTP Config

# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

#Adding logging file
logfile /var/log/ntp.log

# Leap seconds definition provided by tzdata
leapfile /usr/share/zoneinfo/leap-seconds.list

# Enable this if you want statistics to be logged.
#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

#pittsburgh super computing
server 128.182.58.100  iburst
server 204.235.61.9 iburst
server time-west.zia.io iburst
server ntp-0.cso.uiuc.edu iburst
# and NTP2 is for data from normal user, NTP0 is from root

# GPS PPS reference (NTP2)
server 127.127.28.2 minpoll 4 maxpoll 4 prefer
fudge 127.127.28.2 refid PPS

# GPS Serial data reference (NTP0)
server 127.127.28.0 minpoll 4 maxpoll 4
fudge 127.127.28.0 time1 0.670 refid GPS

restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited

restrict 127.0.0.1
restrict ::1

restrict source notrap nomodify noquery

restrict 192.168.0.0 mask 255.255.0.0