OpenDNS somehow not the exclusive DNS

[DominikHoffmann]

I have configured System → General Setup with OpenDNS’s servers

208.67.222.123
208.67.220.123

I have turned on the DNS Forwarder, and it is configured like so:

Still, I can get to some nasty sites. Would the ISP’s DNS still override my selection of the OpenDNS servers? The gateway obtains its WAN IP from the ISP via DHCP.

[SteveITS]

@dominikhoffmann if you query opendns directly does it resolve those domains?

Do you have any other DNS configured on your Pc?

Many browsers use DoH which would bypass local DNS.

FYI the Resolver can also forward.

[DominikHoffmann]

@steveits: I think, it is working as expected now.

[DominikHoffmann]

I can also report that I added the following rules to the LAN interface. They are intended to disallow the bypassing of the OpenDNS servers: