This is the “/etc/ntp.conf” I used when I ran my NTP server on a Raspberry Pi with the Adafruit breakout board (same as current hat). I list it because of the “fudge” line. This was commonly accepted as the proper fudge settings, especially for time2 - 0.350: # /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 # http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html explains # these settings # Slightly modified, but credit to: # Paul Kennedy @ (http://www.raspberrypi.org/phpBB3/viewtopic.php?f=41&t=1970&start=80) server 127.127.20.0 mode 17 minpoll 3 iburst true prefer fudge 127.127.20.0 flag1 1 time2 0.350 server tock.usshc.com iburst server clock.isc.org iburst server tick.apple.com iburst # pool.ntp.org maps to about 1000 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.html> server 0.debian.pool.ntp.org iburst server 1.debian.pool.ntp.org iburst server 2.debian.pool.ntp.org iburst server 3.debian.pool.ntp.org iburst enable auth monitor # enable the good stuff # 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 restrict 192.168.169.0 mask 255.255.255.0 nomodify nopeer notrap
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