TomatoUSB

I have set up a site to site VPN between two tomato routers. I can connect across the VPN, ping, etc… I have DNS on the client side that comes from the server side, but I do not have DNS resolving for the server side. So two questions, what does the Respond to DNS checkbox do internally? That allows the client side to access the DNS from server side and I'm wondering if there is something it does that needs to happen on the client box. I see the firewall on the server side accept the outgoing DNS packet. Any ideas how to troubleshoot this?

Alright I found the issue, the autogenerated dnsmasq settings are incorrect. The interface being used for the VPN tunnel is: tun11. The dnsmasq.conf is being populated with interface=tun21. Does anyone have any idea why this would be occurring?

What hardware and firmware are you running, if you don't mind me asking.

Tomato Firmware v1.28.9054 MIPSR2-beta K26 USB vpn3.6
Netgear WNR3500L/U/v2