How to prioritize a NTP-Server?


I have 3 time servers configured on my RUTX50:


I would like to prioritize the use of time server (1). Time server (2) and (3) only serve as a backup.

I have two questions:

  1. How can I configure the prioritization?
  2. How can I verify which time server is used for synchronization?

Thank you for your support! :pray:


Router will use NTP servers in the order they are provided, giving priority to the first entry, followed by the second, and so forth.

If you want to ensure that a specific NTP server is being used, you may need to use TCPdump. To do this, set the update interval to 60 seconds and run the following command:

tcpdump -i any | grep

By running this command every 60 seconds, you should observe TCP packets related to the specified NTP server (

Note: To install TCPDump, use the following commands:

opkg update
opkg install tcpdump

Best regards,


1 Like

Thank you very much for the very clear and easy to follow answer! :+1:

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