New Around Here
Merlin configures dnsmasq to only listen on the LAN interface br0, as well as any pptp interface. If you want what is technically the WAN port to listen for DNS traffic, you need to add a interface=eth0 or interface=vlan2 to /jffs/configs/dnsmasq.conf, depending on your WAN interface name. But then you might also need a no-dhcp-interface=eth0 (or vlan2) to avoid DHCP conflicts on the other subnet.
Thank you very much! Your suggestion was spot on.
I added the file /jffs/configs/dnsmasq.conf.add with the following contents:
I don't get any warnings from the 10.0.0.x Router concerning DHCP conflicts, so I think it's done. Thank you again.