Fresh install of dev branch?

[jfb]

You can use Pi-Hole as DHCP, set each Pi-Hole to a non-overlapping IP range. Also, for increased reliability, assign from each Pi-Hole the additional DNS of the other Pi-Hole. In case of a failure of either Pi-Hole, the other will pick up the load.

Secondary DNS Server for DHCP

Sure. So the dhcp-option=6,Pi-holeIP,SecondaryDNSIP Woyld look like this: dhcp-option=6,192.168.1.2,8.8.8.8 Assuming pi has 192.168.1.2 ip. Replace with what you have. 8.8.8.8 is the google dns So if you use your pi as dhcp server, it will push those ips as primary and secondary ips.