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Seems like a networking issue rather than a pihole one. I dstnat any DNS request coming from VLANs directly to the pihole's IP address and DNS port. Then in DHCP I set the DNS as the VLAN's gateway (Like 192.x.55.1). In this way the DNS request coming from a VLAN reaches the router and that is passing it forward to the pihole.

Not sure what that Asus Router Pro can achieve. Where did you set those UFW rules what you have shared? I suppose not on the router? If not then are there any specific reason to make your life more difficult than it should be with unnecessary firewall on your pihole machine on your isolated local network?

And deployed pihole where? Docker container or installed directly in OS?

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What about other traffic such as ICMP:

Have you allowed ICMP traffic between your vlans?

The fact that pings are not getting through suggests that VLANs are doing their job (segregating devices on a network).

Check your router docs to see what other steps you will need to take to punch holes between the VLANs to allow the traffic you want.

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Use nslookup instead to diagnose:

nslookup <DOMAIN_NAME> <DNS_SERVER_IP>

Eg:

$ nslookup pi.hole 10.0.0.4
Server:         10.0.0.4
Address:        10.0.0.4#53

Name:   pi.hole
Address: 10.0.0.4
Name:   pi.hole
Address: fe80::XXXX

Is OOTB available on Windows, MacOS and most Linux distros.
And even in an Android terminal.
Not sure about iOS.

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Hey thanks for the response. I created the ufw rules in my Pi and then in the Router it self I added routing.

I am able to ping from .54 network to .55 but I can’t ping the other way around.

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So thats the thing, I can ping from my .54 to .55 but not the other way around.

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Hey - Thanks for the input! I set the UFW rules directly on the PiHole itself and its running directly on the OS not in a Docker container

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Shouldn't the gateway be the IP address of the router interface on the .55 network, not the .55.1 address?

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Sorry yeah updated that but still hitting some walls

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