So I use nextDNS or open dns
This is easily circumvented by firefoxes "use dns over https" which then points out to coudflare or other dns even though i have forced DNS to my filtered provider.
Is there a way to either block doh/dns over https, and force only regular dns or is there a way to block contact to these dns providers?
i have ip tables i could add to, i already block all manner of vpn ports.
im only finding info online about using https dns - not stopping it.
if the kids change their local firefox settings to use dns over https then they bypass my filters