1# 2# $FreeBSD$ 3# 4# Default NTP servers for the FreeBSD operating system. 5# 6# Don't forget to enable ntpd in /etc/rc.conf with: 7# ntpd_enable="YES" 8# 9# The driftfile is by default /var/db/ntpd.drift, check 10# /etc/defaults/rc.conf on how to change the location. 11# 12 13# 14# Set the target and limit for adding servers configured via pool statements 15# or discovered dynamically via mechanisms such as broadcast and manycast. 16# Ntpd automatically adds maxclock-1 servers from configured pools, and may 17# add as many as maxclock*2 if necessary to ensure that at least minclock 18# servers are providing good consistant time. 19# 20tos minclock 3 maxclock 6 21 22# 23# The following pool statement will give you a random set of NTP servers 24# geographically close to you. A single pool statement adds multiple 25# servers from the pool, according to the tos minclock/maxclock targets. 26# See http://www.pool.ntp.org/ for details. Note, pool.ntp.org encourages 27# users with a static IP and good upstream NTP servers to add a server 28# to the pool. See http://www.pool.ntp.org/join.html if you are interested. 29# 30# The option `iburst' is used for faster initial synchronization. 31# 32pool 0.freebsd.pool.ntp.org iburst 33 34# 35# If you want to pick yourself which country's public NTP server 36# you want to sync against, comment out the above pool, uncomment 37# the next one, and replace CC with the country's abbreviation. 38# Make sure that the hostname resolves to a proper IP address! 39# 40# pool 0.CC.pool.ntp.org iburst 41 42# 43# To configure a specific server, such as an organization-wide local 44# server, add lines similar to the following. One or more specific 45# servers can be configured in addition to, or instead of, any server 46# pools specified above. When both are configured, ntpd first adds all 47# the specific servers, then adds servers from the pool until the tos 48# minclock/maxclock targets are met. 49# 50#server time.my-internal.org iburst 51 52# 53# Security: 54# 55# By default, only allow time queries and block all other requests 56# from unauthenticated clients. 57# 58# The "restrict source" line allows peers to be mobilized when added by 59# ntpd from a pool, but does not enable mobilizing a new peer association 60# by other dynamic means (broadcast, manycast, ntpq commands, etc). 61# 62# See http://support.ntp.org/bin/view/Support/AccessRestrictions 63# for more information. 64# 65restrict default limited kod nomodify notrap noquery nopeer 66restrict source limited kod nomodify notrap noquery 67 68# 69# Alternatively, the following rules would block all unauthorized access. 70# 71#restrict default ignore 72# 73# In this case, all remote NTP time servers also need to be explicitly 74# allowed or they would not be able to exchange time information with 75# this server. 76# 77# Please note that this example doesn't work for the servers in 78# the pool.ntp.org domain since they return multiple A records. 79# 80#restrict 0.pool.ntp.org nomodify nopeer noquery notrap 81#restrict 1.pool.ntp.org nomodify nopeer noquery notrap 82#restrict 2.pool.ntp.org nomodify nopeer noquery notrap 83# 84# The following settings allow unrestricted access from the localhost 85restrict 127.0.0.1 86restrict ::1 87 88# 89# If a server loses sync with all upstream servers, NTP clients 90# no longer follow that server. The local clock can be configured 91# to provide a time source when this happens, but it should usually 92# be configured on just one server on a network. For more details see 93# http://support.ntp.org/bin/view/Support/UndisciplinedLocalClock 94# The use of Orphan Mode may be preferable. 95# 96#server 127.127.1.0 97#fudge 127.127.1.0 stratum 10 98 99# See http://support.ntp.org/bin/view/Support/ConfiguringNTP#Section_6.14. 100# for documentation regarding leapfile. Updates to the file can be obtained 101# from ftp://time.nist.gov/pub/ or ftp://tycho.usno.navy.mil/pub/ntp/. 102# Use either leapfile in /etc/ntp or periodically updated leapfile in /var/db. 103#leapfile "/etc/ntp/leap-seconds" 104leapfile "/var/db/ntpd.leap-seconds.list" 105