To be clear: not all traffic has to be routed through it, just DNS. All that I had to do was assign a static IP address to the MAC address of the VM network in

To be clear: not all traffic has to be routed through it, just DNS. All that I had to do was assign a static IP address to the MAC address of the VM network interface, and configure my router's DHCP to hand out that static IP for DNS. It's all done over a singular ethernet connection between my router and the server; the amount of traffic is very minimal.