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I want to setup a small NTP server with ubuntu for a local network. I want that time is taken only from this server and not from outsdie network servers.Also, I want to enable to send MONLIST to clients that request it. I modified the NTP.conf file but I don't think is working. Can you help me? The server has IP address 192.168.2.2 and the client that requires time and MONLIST has IP address 192.168.3.3 The 2 network are connected using a firewall Here is the ntp.conf file

# /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

# Specify one or more NTP servers.

# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
#pool 0.ubuntu.pool.ntp.org iburst
#pool 1.ubuntu.pool.ntp.org iburst
#pool 2.ubuntu.pool.ntp.org iburst
#pool 3.ubuntu.pool.ntp.org iburst

server 127.127.1.0 iburst
fudge 127.127.1.0 stratum 16

# Use Ubuntu's ntp server as a fallback.
#pool ntp.ubuntu.com

enable monitor

# 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 limited
#restrict -6 default kod notrap nomodify nopeer noquery limited

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict 192.168.3.3
restrict ::1

# Needed for adding pool entries
restrict source notrap nomodify noquery

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
restrict 192.168.3.3 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

#Changes recquired to use pps synchonisation as explained in documentation:
#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918

#server 127.127.8.1 mode 135 prefer    # Meinberg GPS167 with PPS
#fudge 127.127.8.1 time1 0.0042        # relative to PPS for my hardware

#server 127.127.22.1                   # ATOM(PPS)
#fudge 127.127.22.1 flag3 1            # enable PPS API
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  • Why do you think it isn't working? What happens when you query the server from the client? And from the server itself? Anything in the log files? Nov 15, 2016 at 10:04
  • if I execute ntpdc -n -c monlist 192.168.2.2 from my client machine to my private ntp server it says "192.168.2.2 timed out, nothing received" @PaulHaldane Nov 15, 2016 at 10:33
  • What do you get if you try that command on the NTP server itself? Nov 15, 2016 at 12:02
  • I get the same message also on the NTP server @PaulHaldane Nov 15, 2016 at 12:07
  • Have you made sure the NTP server is running? Nov 15, 2016 at 16:21

1 Answer 1

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Your clients are on different subnet than the NTP Server. Look in your network topology again. Maybe it is a firewall thing..! Leave 123 tcp port and 123 utp port open on both sides of your subnets or put the NTP Server on the same subnets with your clients and try again.! How are the two subnets connected together?? through a router ? or are they VLANS??? What???

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