Hi -
I have switched on DNS Filtering for a node on my network. I am able to verify the rules in the PREROUTING and DNSFILTER chains in the nat iptables (DNS Filtering is actually set to redirect the nodes DNS requests to the router itself. I can verify that when the node makes DNS requests over UDP that the request is rewritten correctly, however when it makes the request over TCP the request is not rewritten, and goes to the DNS server that the node has hardcoded inside it.
FWIW, NAT is...
DNS Filtering not working with TCP requests
I have switched on DNS Filtering for a node on my network. I am able to verify the rules in the PREROUTING and DNSFILTER chains in the nat iptables (DNS Filtering is actually set to redirect the nodes DNS requests to the router itself. I can verify that when the node makes DNS requests over UDP that the request is rewritten correctly, however when it makes the request over TCP the request is not rewritten, and goes to the DNS server that the node has hardcoded inside it.
FWIW, NAT is...
DNS Filtering not working with TCP requests