Host unable to resolve (or even ping) local domain names for targets running as Docker containers with bridged interfaces

Hi All,

I'm sure this has to be something stupid and small, but my head is a bit overloaded in Home-Assistant mode with my first deployment. This appears to be a two stage problem;

1. Unraid host (192.168.1.20) can't ping from the command line, or perform nslookup to the pi-hole Docker container (192.168.1.24) which is running Network Type: Custom - br0 -- Ethernet (where br0 is eth0+eth1 bonded into bond0, on-board NIC + PCI 10GbE NIC).

• I believe this issue cropped up when i first started fluffing with AdGuard & PiHole, and the solution that solved the problem, was adding a secondary DNS server.
• There are no issues with DNS or accessing Docker containers setup using br0, from my laptop which receives DHCP.

2. Possibly related - Hostnames are not being picked up by pi-hole. "Use Conditional-Forwarding" is enabled in pi-hole, and both pi-hole and the dhcp server share the same domain name (local).

My router is a Unifi Dream Machine & DHCP server (192.168.0.0/22). I've set the .local Domain Name in the UDM & pi-hole.

route, nslookup & ifconfig can be found in this pastebin

Thanks in advance, and please let me know if there's anything further needed.

Nasha