Debian 8 Jessie
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Configure NTP Server2015/05/01
  Configure NTP server for time adjustment. NTP uses 123/UDP.
root@dlp:~#
aptitude -y install ntp
root@dlp:~#
vi /etc/ntp.conf
# line 21: comment out

#
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
# 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

root@dlp:~#
systemctl enable ntp

# show status

root@dlp:~#
ntpq -p 

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ntp1.jst.mfeed. 172.29.1.50      2 u    2   64    1   20.084  -21.584   0.000
 ntp2.jst.mfeed. 172.29.3.50      2 u    1   64    1   20.614  -22.352   0.000
 ntp3.jst.mfeed. 172.29.3.100     2 u    -   64    1   22.385  -22.162   0.000
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