Source ip of the LAN devices must not be NATed

Hi All,
I am trying to setup a RUT955 for the following project.


It is quit simpel setup. Everything works when the mobile WAN is in NAT mode.
But in this case SrvX and SrvY will receive data from lan device 1 and 2 with source ip of the mobile connection of the RUT (10.134.250.1).
Both servers must receive data with the actual lan ip of the devices as source ip (192.168.1.2 / 192.168.1.3).
I thought that changing the mode to bridge or passthrough would be the solution.

  • passthrough: the data still have 10.134.250.1 as source address
  • bridge: not able to ping the servers

What I am missing?

According to the manual:


Does this means that only one device on the LAN can be bridged.

I just figured out that bridge/passthrough is not the way to go. It does the opposite, namely, assigning the mobile ip to one of the devices in the LAN.

Can my setup be achieved with CLI configuration?

Kind regards

I don’t know if this is useful,
but I usually try to solve these problems with port numbers.
Port numbers can be preserved along a path.

The source devices will specify a unique port.
The intermediary devices can use the port numbers to route
and the end devices use the port number to know who sent the packet.

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