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# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
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driftfile /var/lib/ntp/ntp.drift
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5
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# Leap seconds definition provided by tzdata
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leapfile /usr/share/zoneinfo/leap-seconds.list
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7
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8
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# Enable this if you want statistics to be logged.
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#statsdir /var/log/ntpstats/
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10
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statistics loopstats peerstats clockstats
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filegen loopstats file loopstats type day enable
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filegen peerstats file peerstats type day enable
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filegen clockstats file clockstats type day enable
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15
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# Specify one or more NTP servers.
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17
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# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
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# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
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# more information.
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pool 0.ubuntu.pool.ntp.org iburst
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pool 1.ubuntu.pool.ntp.org iburst
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pool 2.ubuntu.pool.ntp.org iburst
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pool 3.ubuntu.pool.ntp.org iburst
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25
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# Use Ubuntu's ntp server as a fallback.
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pool ntp.ubuntu.com
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# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
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# details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
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# might also be helpful.
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#
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# Note that "restrict" applies to both servers and clients, so a configuration
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# that might be intended to block requests from certain clients could also end
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35
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# up blocking replies from your own upstream servers.
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36
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# By default, exchange time with everybody, but don't allow configuration.
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restrict -4 default kod notrap nomodify nopeer noquery limited
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restrict -6 default kod notrap nomodify nopeer noquery limited
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40
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# Local users may interrogate the ntp server more closely.
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restrict 127.0.0.1
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restrict 10.0.0.1
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restrict ::1
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# Needed for adding pool entries
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restrict source notrap nomodify noquery
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48
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# Clients from this (example!) subnet have unlimited access, but only if
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50
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# cryptographically authenticated.
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#restrict 192.168.123.0 mask 255.255.255.0 notrust
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52
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53
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54
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# If you want to provide time to your local subnet, change the next line.
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# (Again, the address is an example only.)
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broadcast 10.0.0.255
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57
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# If you want to listen to time broadcasts on your local subnet, de-comment the
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59
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# next lines. Please do this only if you trust everybody on the network!
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60
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#disable auth
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#broadcastclient
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62
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63
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#Changes recquired to use pps synchonisation as explained in documentation:
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64
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#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918
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65
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66
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#server 127.127.8.1 mode 135 prefer # Meinberg GPS167 with PPS
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67
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#fudge 127.127.8.1 time1 0.0042 # relative to PPS for my hardware
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68
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69
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#server 127.127.22.1 # ATOM(PPS)
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70
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#fudge 127.127.22.1 flag3 1 # enable PPS API
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