MODBUS TCP SLAVE with multiple ethernet board

Hi,

 I've never ecountered this need before.

I'd like to communicate via MODBUS TCP with a labview application.

So in the target PC I have developed a slave VI and in my laptop I have the master.

The problem is that the slave PC has 2 ethernet board and I have to use the secondary board to communicate but I cannot find any settings on how to start the communication on the other board.

So I can communicate if I use the primary IP but not the secondary IP.
How to tell the slave application tu use the secondary IP to communicate

Any suggestion?

thank you

 

P.S.  Labview 2017 with NI Modbus library 1.2.1.42