Does NextDNS Web filter stop user from accessing adult sites when Windows TCP/IP setting of DNS server change to 18.104.22.168?
I am just wondering how can NextDNS Web filter stop user from accessing adult sites, when DNS setting was tampered and changed to a public free DNS server IP, instead of NextDNS?
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No. The activated function Bypass under Parental Control only prevents DoH, VPN, proxies and Tor. However, it does not prevent anyone from using a native DNS or DoT/QUIC server. You must prevent this yourself in your local network.
To ensure the bootstrap is your DNS server you must redirect or block standard DNS outbound (TCP/UDP 53) and block all DNS over TLS (TCP 853) outbound.