Why do you want a new router? Whats the requirement?
Normally you would use a router to subdivide a network. For example in my home network, I have a Balance router (A) connected to the internet with a LAN of 192.168.1.1/24 (it provides DHCP) and I have another balance router (B) with its WAN plugged into the lan of A (via a switch). Router B’s wan (no NAT - with IP forwarding configured) is set to static and is 192.168.1.254, its lan (DHCP) is 172.16.1.1/24. Router B has its own physically separate LAN switch into which i plug all my test and R&D equipment for my test lab.
Router B’s LAN is my test network. But i need to access my NAS on Router A’s LAN and my workstation on Router A’s LAN needs to be able to access devices on Router B’s LAN. To do this I have a static route set on Router A for 172.16.1.0/24 → 192.168.1.254
