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Hello,

Please, describe in more detail what you are trying to achieve?

Best regards.
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Maybe it is mission impossible.

I have connecter tipical Siemens 1200 PLC on LAN site.

After open the tunnel from PC to TRB140 I can manage this PLC from PC.

But , if I open WWW page on PC, data comming from gsm card installed on TRB140.

Also any internet connections in background on PC read data from TRB140.

I want to achieve situation, that only data from PLC comming from TRB140.

Is it possible to do...?
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I didn't quite understand the connection topology.

The PLC is connected to the TRB, a VPN connection is established between the PC and the TRB. Is it correct?
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One PLC is connected to TRB on RJ45 port.

As you wrote, VPN is established between PC and TRB, (OpenVPN).
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If the computer is not directly connected to TRB, it cannot use the mobile data of your TRB, because it has a different source of internet connection.