You don't need a router. If you set the subnet mask on all of the PCs to be 255.255.0.0, then they should all be able to ping each other. Basically, opening up the subnet mask puts all of the PCs on ...
I’m moving to a temporary housing situation where I need to integrate myself into the existing home network. The house ISP is Comcast. The cable modem is in the room where my gear will be, but the ...