Customer is asking about putting the backup gateway at a DR site across a WAN link rather than co-located. The docs say both nodes should be on the same network but I want to confirm if this officially unsupported, or has anyone done it successfully? What's the recommended architecture when the requirement is site-level survivability, not just server-level?
If you have PLCs communicating to this gateway, this is a terrible idea. Most PLC communication protocols, if not all of them, will perform horribly if all across a WAN interface.
On top of that, yes the redundant servers MUST communicate to each other via the same network and the clients as well MUST be on the same network. The clients use that network as well to determine the active server.
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