Issue with bridge br0 DNS when I change the nameserver address 20.04

So basically I have an issue when I change my bridge br0 namerserver from 192.168.50.1 which points to a pfSense router, to my PiHole ad blocker. All clients get dhcp from the PiHole and are working as expected via DNS from the Pihole.

The PiHole is hosted on a qemu/kvm on a 24/7 Computer.

kvm Host: Kubuntu 20.04 Virt Manager 2.2.1

netplan-
network: version: 2 #renderer: NetworkManager renderer: networkd ethernets: enp4s0: dhcp4: false dhcp6: false bridges: br0: interfaces: [enp4s0] addresses: [192.168.50.70/24] gateway4: 192.168.50.1 nameservers: addresses: [192.168.50.1] parameters: stp: false forward-delay: 0 dhcp4: no dhcp6: no

This works fine ( not using the PiHole), but if I change:

nameservers: addresses: [192.168.50.10] 

which is the address of the Pihole DNS breaks

I did run a pcap, and I will not see any packets for dns as I would when I point to the GW.

KVM and bridging is new to me, so I must be missing a understanding of the configuration some how, and I hope to get a clue. Reading many of the posts similar to my issue did not seem to have the same issue where it is just the Host that was not working.

One clue that I see is when i use the command: route

when configured for the PiHole:

default _gateway 0.0.0.0 UG 0 0 0 br0

and when configured for the pfsense:

default pfsense.local 0.0.0.0 UG 0 0 0 br0

other then that, all the other routes are the same, and I can ping the PiHole.

It is like when I change the nameserver IP DNS just breaks, nothing leave the br0. Same if I were to use an IP like 8.8.8.8. I move it back to the GW of the pfSense, works.

Thoughts?

Much appreciated and best regards,

JC

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