If a router does not have a route to the destination network, it will drop the packet. If the network is directly attached, the router will arp for the MAC. if there’s no response it will send a ICMP host unreachable message.

You can have overlapping routes but not overlapping subnets.

If a router does not have a route to the destination network, it will drop the packet. If the network is directly attached, the router will arp for the MAC. if there’s no response it will send a ICMP host unreachable message.

Don’t confuse routes with subnets. You can have overlapping routes but not overlapping subnets. So 192.168.22.1 can only exist in one subnet.