We have two industrial machines (let's call them Holding and Media) with configured network addresses 220.127.116.11 and 18.104.22.168 respectively. Currently they are isolated physically although logically in same subnet. There is no option to change any config in the machines (it's very old controllers so it's near impossible without lot's of overhead). We need to connect these machines to another machine running windows 10 with OPC server and with 4 NICs. We would like to keep single machine and single OPC server if possible for lower complexity and costs (OPC server with the required drivers is costly) AND keep the machines segregated as before connection - (ZERO traffic leak between machines) - to avoid unexpected behaviors and as well for better cyber protection. The diagram is below:
What we have tried is naively configuring 2 NICs to have same subnet intending latter to add 22.214.171.124/32 route for Media and 126.96.36.199/32 for Holding to find out the way out the Windows. Using Windows Settings and NetSetMan. Seems that windows does not complain, but inspecting ipconfig and "route print" shows that only one NIC is actually properly configured.
Please suggest our alternatives, what would you do ? Thanks. Alex