sonic-buildimage/files/image_config/ntp/ntp.conf.j2

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# Managed by Ansible
# file: ansible/roles/acs/templates/ntp.conf.j2
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# /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.your-provider.example

# 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>
{% for ntp_server in NTP_SERVER %}
server {{ ntp_server }} iburst
{% endfor %}

#only listen on MGMT_INTERFACE, LOOPBACK_INTERFACE ip when MGMT_INTERFACE is not defined, or eth0 
# if we don't have both of them (default is to listen on all ip addresses)
interface ignore wildcard
{% if MGMT_INTERFACE %}
{% for (mgmt_intf, mgmt_prefix) in MGMT_INTERFACE|pfx_filter %}
interface listen {{ mgmt_prefix | ip }}
{% endfor %}
{% elif LOOPBACK_INTERFACE %}
{% for (name, prefix) in LOOPBACK_INTERFACE|pfx_filter %}
{% if prefix | ipv4 and name == 'Loopback0' %}
interface listen {{ prefix | ip }}
{% endif %}
{% endfor %}
{% else %}
interface listen eth0
{% endif %}
interface listen 127.0.0.1

# 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