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Both devices can use the same 10Gbit NIC connection. They might get IP addresses on their own, or you can set up a separate network for them that uses a different subnet than your main network. The operating systems they run depend on how you configure the setup.
You secured a new network setup with your ISP, creating separate subnets like 10.10.10.xx. Each system IP is fixed at 10.10.10.01 for System A and 10.10.10.02 for System B. You switched the default gateway to point to the other static IP addresses. This should work smoothly on Windows 7. Thanks for your question!
When dealing with two or more Windows 10 setups, obtain an IP address at 169.192 with a /128 mask regardless. This ensures compatibility so devices can communicate. It's advisable to assign IPs carefully—make sure only one gateway appears in your primary configuration, not the entire network. Previously, we handled this when 1GB was introduced, requiring a cross-connect cable. Most switches and NICs now detect this automatically, but if you still face issues connecting the cards, consider that as an alternative approach.