I'm helping a friend set up a small network in his restaurant after he got internet installed. He used to have a peer to peer through a router but wants to incorporate his new internet router. I was going to plug the cable that went to his office PC to the internet router as well as his computer. My question is really around his original router since I haven't set up a network with 2 routers. I'm assuming I would set all the PCs up with a 192.168.0.x address with the gateway being the internet router. Do i set the original router to give out IPs in that same subnet or does it have to be a new one?
I drew a very rough sketch of what he currently has set up, if that helps.