Set up NTP synchronisation - IT Security

  • Published on Jul 18, 2024

The NTP synchronisation provides for a regular update of the internal clock of the router.

The following elements are required to synchronise the internal clock with the NTP (Network Time Protocol= server:

  • Specification of the NTP server and the timezone

  • Event for triggering the synchronisation

  • Firewall rule that permits the router to connect to NTP server

    1. Click in the cog Administration → Time / Date menu in the Clock synchronisation section on pencil and select the Time zone of the router location.

    2. Take the suggested NTP server of the Physikalisch-Technische Bundesanstalt or enter the address of an alternative NTP server into the Time server field.

    3. Click on   SUBMIT  .

    4. Click in the update Events → Events menu on plus and add a new event:

  • Event: select a regular occurring event that is supposed to trigger the NTP synchronisation (such as the change of an interface status to online or the expiry of a timer)

  • Action: Synchronise clocck via NTP

    1. Click on   SUBMIT  .

    2. Click in the lan Network → Firewall / NAT menu in the IP-Filter section on plus and add a new filter rule:

  • Packet direction: OUTPUT

  • IP version: All

  • Protocol: UDP

  • Output interface: select the configured WAN interface, e. g. lte2

  • Destination port: 123

    1. Click on   SUBMIT  .

    2. Click on   ACTIVATE PROFILE  cog white  .

    3. To test the NTP synchronisation, click in the cog Administration → Time / Date menu in the Clock synchronisation section on refresh.