IPMI
IPMI
You can connect it like a regular 1GB LAN cable, but make sure the port supports IPMI communication. Check your SuperMicro model to confirm compatibility.
You're correct, a stable internet connection is necessary for accessing the FreeNas Web UI. Your LAN setup seems sufficient for connecting to the devices, but ensure the network is secure and functioning properly.
It's likely you could reach the Freenas web UI from those two devices, though Freenas wouldn't have internet access, meaning no updates would be available.