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

driftfile /var/lib/ntp/ntp.drift


# 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


# You do need to talk to an NTP server or two (or three).
server ntp.ubuntu.com
server 0.us.pool.ntp.org
server 1.us.pool.ntp.org
server 2.us.pool.ntp.org
server 4.us.pool.ntp.org


# this clock unit is driven by the  NMEA gps string
server 127.127.28.0 minpoll 4
fudge 127.127.28.0 time1 0.460 stratum 5 refid GPSD

# this clock unit is driven by the gps PPS signal on the
# DCD pin of the serial port
server 127.127.28.1 minpoll 4 true
fudge 127.127.28.1 refid GPSD

# this clock unit is driven by the  NMEA gps string
server 127.127.28.2 minpoll 4
fudge 127.127.28.2 time1 0.460 stratum 5 refid GPSD

# this clock unit is driven by the gps PPS signal on the
# DCD pin of the serial port
server 127.127.28.3 minpoll 4 true
fudge 127.127.28.3 refid GPSD

# Generic NMEA GPS receiver
# mode : bit0 - GPRMC, bit1 - GPGGA, bit2 - GPGLL
#server 127.127.20.0 mode 4 minpoll 4 maxpoll 4 true
#fudge  127.127.20.0 flag2 0 flag3 0    # disable kernel PPS support

# PPS clock discipline (requires PPSAPI interface)
# flag2 sets PPS on-time edge: 0 assert, 1 clear
# flag3 enables kernel PPSAPI: 0 disable, 1 enable
#server	127.127.22.0 minpoll 4 maxpoll 4 true
#fudge	127.127.22.0 flag2 0 flag3 1    # disable kernel PPS support


# this tells NTP to use the local computer clock as a last resort
# (stratum 10) when all other clocks fail
server 127.127.1.0
fudge 127.127.1.0 stratum 10

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust


# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient
