By default Moca on the Comcast modem is turned off unless someone goes in and manually turns it on, this is an installation practice for a reason. The way the boxes communicate with each other is thru this MoCA network, therefore the DVR's are considered the preferred network controller. If preferred network controller is turned on inside the Comcast gateway, then the boxes and DVR's start looking at the modem as their primary hub so to speak causing them to stop working and no video feed. The only time Moca is enabled on the Comcast gateway is when and if you have a wireless box, xi5 or xi6, this enables the wireless boxes to communicate with the modem and to be part of the MoCA network, however the primary network controllers still needs to be turned off so the wifi boxes after connecting to the modem and become part of the MoCA network then get their video feeds from the DVR tuner. Preferred network controller is something only Comcast can turn on and off and is not intended or even accessible to the regular end user. That is why you cannot access this function, and depending on whom logs into your modem when you call in for a service call, either turn the network controllers on or off. They should always be off in the modem as the modem is never the primary network controller in a MoCA network providing tv service to all of the Comcast X1 boxes. While Comcast uses Moca technology as a way for their boxes to communicate, if you introduce another Moca device to the network that is not part of the tv service then Comcast or their customer service can do very little to help accommodate your requests other than verify the settings on their devices are set properly for their equipment to work. While they will make an attempt to help you, they are not trained in 3rd party hardware that gets added by the customer.
... View more