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Two devices, same IP address

Two devices, same IP address

Two devices, same IP address
Two devices, same IP address
12 hours ago
Tags: #VLAN & Multi-Networks #WAN Setup #NAT #Routing
Model: ER605 (TL-R605)  
Hardware Version: V2
Firmware Version: 2.2.5 Build 20240522 Rel.75860

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.

 

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#1
2 Reply
Re:Two devices, same IP address
11 hours ago

  @Krusing 

 

If both sensors have the same local IP address, the gateway will always see an IP conflict.  I would place another (inexpensive) router between the gateway and one of the sensors which would mean double NAT but should work OK.

1x ER7406 1x OC300 4x SG2008 1x EAP610 3x EAP650-Desktop 1x EAP772-Outdoor
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#2
Re:Two devices, same IP address
10 hours ago

  @jra11500 

 

Thank you for the reply. That would likely work.

 

However, I am looking at a TP-Link Omada Pro S5500-4XHPP2XF switch, since it appears to have significantly more advanced L2+/L3 functionality than the ER605.

 

My question is whether the S5500 would be able to handle this type of design:

Port 2 -> dedicated VLAN -> dedicated L3 interface  
Port 3 -> dedicated VLAN -> dedicated L3 interface  


Same device IP behind both ports (192.168.60.3)  
Traffic controlled by policy / ACL / routing per VLAN

 

For example:

VLAN10 interface: 192.168.60.1/24  
VLAN20 interface: 192.168.60.2/24

with Sensor A = 192.168.60.3 on Port 2  
and Sensor B = 192.168.60.3 on Port 3

 

So each sensor would be isolated on its own VLAN/interface even though both devices use the same local IP.

 

Would the S5500 support this, or would true VRF-capable hardware such as the S6500 / S7500 series be required for overlapping identical subnets?

 

The S6500/S7500 models seem oversized for this small two-sensor setup, so I am trying to determine whether the S5500 could solve it in a cleaner way than adding another router.

 

Thank you.

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#3

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VLAN & Multi-Networks WAN Setup NAT Routing
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