Pi-Hole and VINCENT modem-router: DNS issues, pi-hole managing some traffic but Internet not working

[deHakkelaar]

@PantsMasterson

The pi-hole is set to be the DHCP server for the house.

If the Pi is going to act as DHCP server, it needs to be configured with a true static IP and not only a static DHCP reservation from the router!
How did you set a static IP on the Pi?
And what OS release is displayed if run below?

hostnamectl

@PantsMasterson

First, I set the VINCENT modem-router DNS to
192.168.2.19 (pi-hole IP address)
1.1.1.1 (fallback)

If you set a "fallback", you allow ads to leak in:

Why should Pi-hole be my only DNS server?

Reduced Ad Blocking Capability The main reason you should Pi-hole as your only DNS server is that you will see increased performance in the blocking of ads. If you have two DNS servers (Pi-hole and something else), your network clients may not always query Pi-hole for name resolution. If a query happens to be answered from a non-Pi-hole DNS server, your block lists will not apply (since that DNS server doesn't know about them). All Queries Need To Go Through Pi-hole First Since other DNS serv…

@PantsMasterson

When I run netsh interface ipv4 show dnsservers

And below for IPv6?

netsh interface ipv6 show dnsservers

Redact the latter part of IPv6 addresses listed, if any, and want to post here!