Pi Hole not matching IP and not able to ads block (lack of network knowledge)

[deHakkelaar]

Try to disable anything IPv6 related on the router and disconnect and reconnect the client again to check DNS servers assigned.

EDIT:

Pi-hole working with OpenVPN but not working without it

If have doubts about settings being pushed by router to clients, try install nmap on Pi-hole: sudo apt install nmap And do a dhcp-discovery against the router that does DHCP for your clients with below one: sudo nmap -sU -p67 --script dhcp-discover <ROUTER_IP_ADDRESS> Example with 10.0.0.2 doing DHCP for my network: xbian@avr ~ $ sudo nmap -sU -p67 --script dhcp-discover 10.0.0.2 Starting Nmap 7.40 ( https://nmap.org ) at 2019-02-21 06:31 CET Nmap scan report for noads.dehakkelaar.nl (10.0…