Noticed something funny with how DNS resolution is performed on the Guest Network of a Deco PX50 unit.

On my network I use pihole to perform ad blocking and I have configured the Deco PX50 to have the fixed IP of my pihole (192.168.68.100) as the primary DNS server in the DHCP settings.

This seems to work fine on the Main network as each of my devices can see the pihole, the use it for DNS queries and anything that is not blocked then goes out to OpenDNS for resolution.  If you look at the images below you will see how the Deco gives my laptop the DNS server as 192.168.68.100, which is pingable and a ping to google resolves correctly.

The story on the Guest Network is different as none of the devices can see the pihole, so DNS resolution fails.  If you look at the images below you will see how the Deco gives my laptop the DNS server as 192.168.68.100 which I cannot ping, and a ping to google also fails.

The pihole has been given a static IP address in the DHCP reservations and in the images below you will see how pihole has been set as the Primary DNS.

This seems like a bug as the Deco is giving clients a DNS server on the Guest Network that they cannot reach, which causes the DNS resolution to fail and makes it look like the internet is not available for devices connected to the Guest Network.

Any help to resolve would be appreciated please.

Thank-you.

Configuration of my Main Network

Configuration of my Guest Network

How the DNS Server is configured in The Deco App