DNS for OpenVPN users

[seamus]

My OpenVPN setup is working well enough in OPNsense. The only niggle is that once I'm on the "LAN side" of the firewall, DNS does not work for any of the hosts on the local network. Outbound DNS seems to work OK for an external VPN user, but the only way I can reach my internal hosts is to look up the DHCP assignment table in OPNsense!

I'm currently using Dnsmasq, set to listen on Port 53. "Register DHCP leases" and "Register DHCP static mappings" boxes are ticked.

Also, the MDNS Repeater is enabled. This one looks suspect... A note says "At least two interfaces must be selected.", but I've only ticked the LAN interface.

Unbound DNS and OpenDNS are NOT enabled.

How should I configure DNS to provide OpenVPN users with reliable DNS for all hosts on the local network??