Openwrt NTP override

Force all devices to sync time with openwrt’s NTP server

First see why you need to do that.

• Some devices have ntp ip or dns hardcoded
• some devices need to sync time for showing the right data according to set timezone
• some countries have change in time due to summer and winter

So lets see how to do that:

Proper/Easy way:

Find where NTP is set up in settings (Web UI) and point it to your router.

Hacky way:

If the device uses DNS names of NTP servers, override that locally to resolve these names to your IP (LuCI/DHCP and DNS / Hostnames)

Even more Hackyway:

Catch all port 123/UDP traffic and redirect locally.

Reference

https://forum.openwrt.org/t/ntp-problem-with-a-tp-link-camera/145401/2

DNS override/hijacking

https://openwrt.org/docs/guide-user/firewall/fw3_configurations/intercept_dns