I have currently using a TP-Link Archer C20 wireless router and am administering the home WiFi network. There are quite a few kids who use this network and my aim is to block pornographic content through this network. OpenDNS seemed to be the best option to setup on the router.

If any devices using this WiFi have their own hard-coded DNS settings, it circumvents the router's DNS settings. The solution I found after visiting many forums is to force all the DNS traffic through port 53 of the router. This forces all the network traffic to use the router's DNS settings.

I couldn't find any solution on how to implement this in a TP-Link router. How can I achieve this?