Still not getting it. As far as the router is concerned it's all the same. For a normal networking setup you are going to use the same subnet for all devices on your network so they can communicate with each other, and you are also going to have your router assign IP addresses via DHCP on that subnet, or you are manually specifying static IP addresses on that subnet. Let's say in the minimal case you only have an XL4 and a Mini using MoCA and the XL4 connects to your router. You are still bridging MoCA to ethernet in order for the XL4 and Mini to be able to connect to the internet, so even in simplest case you are always bridging MoCA to wired ethernet.