Setting NTP SErver di Debian

root@rufaidah:~# aptitude -y install ntp

root@rufaidah:~# vi /etc/ntp.conf

# line 21: make it comment
# 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@rufaidah:~# /etc/init.d/ntp restart
[ ok ] Stopping NTP server: ntpd.
[ ok ] Starting NTP server: ntpd.

root@rufaidah:~# ntpq -p # check working
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ntp1.jst.mfeed. 172.29.3.50      2 u   27   64    1   18.466   -0.379   0.000
 ntp2.jst.mfeed. 172.29.2.50      2 u   26   64    1   18.773    0.316   0.000
 ntp3.jst.mfeed. 172.29.3.50      2 u   25   64    1   20.092   -2.592   0.000