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...?