Debian 9 Stretch
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Configure NTP Server(NTPd)
2017/06/18
 
Install NTPd and Configure NTP server for time adjustment. NTP uses 123/UDP.
[1] Install and Configure NTPd.
root@dlp:~#
apt -y install ntp
root@dlp:~#
vi /etc/ntp.conf
# line 18: comment out

#
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
# add servers in your timezone to sync times

server ntp.nict.jp iburst
server ntp1.jst.mfeed.ad.jp iburst
server ntp2.jst.mfeed.ad.jp iburst
# line 50: 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
==============================================================================
 ntp-b3.nict.go. .NICT.           1 u    1   64    1   19.707    5.647   0.383
 ntp1.jst.mfeed. 133.243.236.17   2 u    1   64    1   16.625    5.942   0.657
*ntp2.jst.mfeed. 133.243.236.17   2 u    1   64    1   16.673    5.971   0.487
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