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apt-get install ntp

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hwclock --systohc

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

server ptbtime1.ptb.de iburst
server ptbtime2.ptb.de iburst
server ptbtime3.ptb.de iburst
server ntp1.t-online.de iburst

# 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

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restrict 12.345.678.912 notrust

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nmap 127.0.0.1 -sU
123/udp open|filtered ntp

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root@gromit /etc # ntpq
ntpq> lpeers
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+ntp1.hetzner.de 192.53.103.103   2 u  519 1024  377    2.580    0.015   0.045
*ntp2.hetzner.de 192.53.103.104   2 u  241 1024  377    0.319    0.113   0.204
+ntp3.hetzner.de 192.53.103.104   2 u  693 1024  377    0.272    0.391   0.301
-lasvegas-nv-dat 67.18.187.111    3 u  868 1024  377  163.572    2.234   2.083
-carol.askja.de  192.53.103.108   2 u  115 1024  377   13.953   -4.154   0.215
ntpq> quit