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GPS + multicast ntp server configuration
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# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help | |
driftfile /var/lib/ntp/ntp.drift | |
# 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 | |
# Specify one or more NTP servers. | |
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board | |
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for | |
# more information. | |
pool 0.ubuntu.pool.ntp.org iburst | |
pool 1.ubuntu.pool.ntp.org iburst | |
pool 2.ubuntu.pool.ntp.org iburst | |
pool 3.ubuntu.pool.ntp.org iburst | |
# Use Ubuntu's ntp server as a fallback. | |
pool ntp.ubuntu.com | |
# 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 limited | |
restrict -6 default kod notrap nomodify nopeer noquery limited | |
# Local users may interrogate the ntp server more closely. | |
restrict 127.0.0.1 | |
restrict ::1 | |
# Needed for adding pool entries | |
restrict source notrap nomodify noquery | |
# broadcast time to local network | |
broadcast 224.0.1.1 | |
# GPS reference (NTP0) (offset for my BU-353-S4) | |
server 127.127.28.0 minpoll 4 maxpoll 4 | |
fudge 127.127.28.0 time1 -0.4 refid GPS | |
# PPS reference (NTP1) | |
server 127.127.28.1 minpoll 4 maxpoll 4 prefer | |
fudge 127.127.28.1 refid PPS |
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