Ubuntu 15.04
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Configure NTP Server
2015/04/24
  Configure NTP server for time adjustment. NTP uses 123/UDP.
root@dlp:~#
apt-get -y install ntp
root@dlp:~#
vi /etc/ntp.conf
# line 19: comment out

#
server 0.ubuntu.pool.ntp.org
#
server 1.ubuntu.pool.ntp.org
#
server 2.ubuntu.pool.ntp.org
#
server 3.ubuntu.pool.ntp.org
#
server ntp.ubuntu.com
# change servers for synchronization

server ntp1.jst.mfeed.ad.jp
server ntp2.jst.mfeed.ad.jp
server ntp3.jst.mfeed.ad.jp
# line 48: add the network range you allow to receive requests

restrict 10.0.0.0 mask 255.255.255.0 nomodify notrap

root@dlp:~#
systemctl restart ntp

# show status

root@dlp:~#
ntpq -p 

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ntp1.jst.mfeed. 133.243.236.17   2 u    3   64    1   20.052    2.622   0.000
 ntp2.jst.mfeed. 210.173.160.86   2 u    2   64    1   19.616    2.274   0.000
 ntp3.jst.mfeed. 210.173.160.56   2 u    1   64    1   18.126    1.942   0.000
 europium.canoni .INIT.          16 u    -   64    0    0.000    0.000   0.000
 
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