How to prioritize a NTP-Server?

Networking Solutions
1

Hello,

I have 3 time servers configured on my RUTX50:

(1) 192.168.0.10
(2) 0.openwrt.pool.ntp.org
(3) 1.openwrt.pool.ntp.org

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:

3

Hello,

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:

2024-03-07-16-19-49-RUTX12 - Teltonika Networks — Mozilla Firefox
2024-03-07-16-19-49-RUTX12 - Teltonika Networks — Mozilla Firefox826×444 13.5 KB

tcpdump -i any | grep 0.openwrt.pool.ntp.org

By running this command every 60 seconds, you should observe TCP packets related to the specified NTP server (0.openwrt.pool.ntp.org).

2024-03-07-16-24-13-192.168.1.1
2024-03-07-16-24-13-192.168.1.11046×229 11.1 KB

Note: To install TCPDump, use the following commands:

opkg update
opkg install tcpdump

Best regards,

Marijus

4

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