Router works in Network Layer of OSI model
Assuming you are using the OSI Modem a router sits on Layer 3: Network
A router must implement the Physical layer, the Link layer, and the Network layer
Router is a Layer 3 (Network Layer)device that checks packet's IP Address at input interface & routes them to interface connected to destination network if available.
We know that a router is a layer 3 device means Network Layer. Router is a only device that can forward only uni cast massage. If u configure the router well and connect the two separate network, i think the network will go finely.
Perhaps you mean a router?
Network Layer - Does path determination and logical addressing.
The network address
A router
routable
Physical layer = Hub, NIC, Repeater. Data Link Layer = Switch, Bridge. Network Layer = Router.
ROUTER!