AMS-IX Public NTP can be configured on most operating systems using either system settings or configuration files. For better accuracy and resilience, we recommend configuring two NTP servers:
You can configure AMS-IX Public NTP via the command line, graphical interface, or configuration files. Using the command line:
1. Ensure you have administrator privileges
2. Open the Terminal application
3. Set the AMS-IX Public NTP servers:
sudo systemsetup -setnetworktimeserver "time1.ams-ix.net,time2.ams-ix.net"4. Enable network time synchronisation:
sudo systemsetup -setusingnetworktime on1. Ensure you have administrator privileges
2. Open Date & Time settings
3. Go to the Internet Time tab
4. Click Change settings
5. Enable Synchronise with an Internet time server
6. Enter: time1.ams-ix.net
7. Click Update now
8. Confirm and click OK to save
Most systems use an NTP daemon such as NTP, NTPsec, Chrony, or OpenNTPD, configured via ntp.conf (or equivalent).
Example configurations
Pool mode (recommended):
pool time1.ams-ix.net iburst preferServer mode (explicit servers):
server time1.ams-ix.net iburst
server time2.ams-ix.net iburst With authentication (on request):
server time1.ams-ix.net iburst key 1Notes:
Ubuntu uses timesyncd by default.
Edit:
/etc/systemd/timesyncd.confExample:
NTP=time1.ams-ix.net time2.ams-ix.netRestart the service:
sudo systemctl restart systemd-timesyncdWhen configuring network equipment, include multiple time sources for redundancy.
Cisco IOS / NX-OS
config t
no ntp server
ntp server ntp.time.nl prefer
end
copy running-config startup-config Juniper JunOS
system {
ntp {
server time1.ams-ix.net prefer;
}
} How to set AMS-IX Public NTP with Chronyd:
# AMS-IX NTP servers
server time1.ams-ix.net iburst minpoll 4 maxpoll 6
server time2.ams-ix.net iburst minpoll 4 maxpoll 6
# SIDN NTP servers
server ntp1.time.nl iburst minpoll 4 maxpoll 6
server ntp2.time.nl iburst minpoll 4 maxpoll 6
# Record the rate (frequency) at which the system clock gains/loses time
driftfile /var/lib/chrony/drift
# Only allow stepping in the first update if offset > 1 second
# After that, always slew (gradually adjust)
makestep 1.0 1
# Limit clock drift rate correction to 500 ppm
maxdrift 500
# Lock the clock after it's been synchronised — reject large corrections
maxchange 100 1 2
# Enable kernel synchronisation of the real-time clock (RTC)
rtcsync
# Specify directory for log files
logdir /var/log/chronyHow to set AMS-IX Public NTP with NTPD:
# AMS-IX NTP servers
server time1.ams-ix.net iburst
server time2.ams-ix.net iburst
# SIDN NTP servers
server ntp1.time.nl iburst
server ntp2.time.nl iburst
# Drift file
driftfile /var/lib/ntp/drift
# Panic threshold — exit if offset exceeds 1000 seconds (0 = never panic)
tinker panic 1000
# Step threshold — only step if offset > 0.128s, otherwise slew
tinker step 0.128
# Stepout — time in seconds before ntpd will step instead of slew
# Set high to prefer slewing over stepping tinker stepout 900
# Frequency tolerance — limit drift correction rate (ppm) tinker allan 1500
# Restrict default access
restrict default kod nomodify notrap nopeer noquery limited
restrict -6 default kod nomodify notrap nopeer noquery limited
# Allow localhost full access
restrict 127.0.0.1
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