networking - Is it possible to configure a NAT routing device to have the same subnet on both WAN and LAN interfaces?

Case example for a router (or balancer, NAT gateway... etc):

• LAN interface (say eth0) with IP 192.168.1.1 on 192.168.1.0/24 subnet. Acting as DHCP (and internet) server.


• WAN interface (say eth1) with IP 192.168.1.100 on 192.168.1.0/24 subnet. Gateway is 192.168.1.1 (IP corresponding to, say, a DSL router).

Could this work?

If needed, I could add some scheme or graphic.