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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
logfile /var/log/ntp.log

# 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
server ntp.nic.cz
server tik.cesnet.cz

# 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 0.debian.pool.ntp.org iburst
#pool 1.debian.pool.ntp.org iburst
#pool 2.debian.pool.ntp.org iburst
#pool 3.debian.pool.ntp.org iburst


# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page 
# 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

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust
restrict 192.168.0.0 mask 255.255.255.0 notrap nomodify

# 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

12 Aug 18:23:34 ntpd[3378]: kernel reports TIME_ERROR: 0x4041: Clock Unsynchronized
12 Aug 18:23:34 ntpd[3378]: kernel reports TIME_ERROR: 0x4041: Clock Unsynchronized

ntp.service - Network Time Service
   Loaded: loaded (/lib/systemd/system/ntp.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2020-08-12 18:23:34 CEST; 4min 23s ago
     Docs: man:ntpd(8)
  Process: 3372 ExecStart=/usr/lib/ntp/ntp-systemd-wrapper (code=exited, status=0/SUCCESS)
 Main PID: 3378 (ntpd)
    Tasks: 2 (limit: 4915)
   Memory: 1.5M
   CGroup: /system.slice/ntp.service
           └─3378 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -c /run/ntp.conf.dhcp -u 106:112

srp 12 18:23:34 LSPC02 systemd[1]: Starting Network Time Service...
srp 12 18:23:34 LSPC02 ntpd[3372]: ntpd 4.2.8p12@1.3728-o (1): Starting
srp 12 18:23:34 LSPC02 ntpd[3372]: Command line: /usr/sbin/ntpd -p /var/run/ntpd.pid -g -c /run/ntp.conf.dhcp -u 106:112
srp 12 18:23:34 LSPC02 systemd[1]: Started Network Time Service.
srp 12 18:23:34 LSPC02 ntpd[3378]: proto: precision = 0.070 usec (-24)
srp 12 18:23:34 LSPC02 ntpd[3378]: leapsecond file ('/usr/share/zoneinfo/leap-seconds.list'): good hash signature
srp 12 18:23:34 LSPC02 ntpd[3378]: leapsecond file ('/usr/share/zoneinfo/leap-seconds.list'): loaded, expire=2020-12-28T00:00:00Z last=20
srp 12 18:23:34 LSPC02 ntpd[3378]: switching logging to file /var/log/ntp.log