I am trying to use an ER605 as a gateway for two industrial Ethernet sensors that both have the same fixed factory IP address. The router receives traffic from the sensor port, but I cannot successfully communicate with the sensor through the external mapped IP.

Both sensors are identical devices and both use
IP: 192.168.60.3
Subnet: 255.255.255.0

The sensor IP cannot be changed, so I need to make both units reachable simultaneously from our company network by assigning each sensor its own external IP.

My goal is
Sensor A reachable as XXX.XX.2.41
Sensor B reachable as XXX.XX.2.42

Hardware layout
WAN port -> company network
WAN/LAN1 -> Sensor A
WAN/LAN2 -> Sensor B
LAN port -> local management

What I want ER605 to do
XXX.XX.2.41 -> Sensor A (192.168.60.3)
XXX.XX.2.42 -> Sensor B (192.168.60.3)
 

Current router interface configuration

WAN DHCP from company network

WAN/LAN1 Static IP 192.168.60.1 /24 - Connected directly to Sensor A

WAN/LAN2 Static IP 192.168.60.2 /24 - Connected directly to Sensor B

So each sensor is on its own dedicated subnet-facing interface

NAT / One-to-One NAT rules

XXX.XX.2.41 -> Sensor A (192.168.60.3 via WAN/LAN1)
XXX.XX.2.42 -> Sensor B (192.168.60.3 via WAN/LAN2)

WAN receives IP correctly from company network.

Both WAN/LAN1 and WAN/LAN2 show Link Up.

Router management page is reachable from company network.

Tried One-to-One NAT mappings.

Tried Virtual Server / Port Forwarding rules for ports.

Tried diagnostics from router side.

Sensors still do not respond externally.