Found a note on this. It was a Buffalo router, and was forwarding "link-local" traffic (the DECA network uses link local addresses 169. etc to communicate between the DVRs) to the ISP itself. This meant whole-home worked fine, until you connected the system to the customer's router. Then the DVRs stopped communicating with each other. Not sure what the solution turned out to be, the router should not be doing this..
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