Not complaining, but why is Mini working on MoCA with no adapter?

That sounds like it's working as designed.
The Roamio [edit: Plus or Pro] is designed to work as a MoCa bridge - so it can both provide TiVo streams to a MoCA connected Mini and also bridge local network/internet traffic between Ethernet/WiFi and MoCA.

The Mini is designed to work as a MoCA client. It can received TiVo streams and network and internet connection over MoCA (or it can also do so over Ethernet). But it cannot act as a bridge. So if you connected it via MoCA and Ethernet it (unlike the Roamio) can't transfer data/traffic between those two network types.

You'd only need a MoCA adapter or MoCA enabled router for that setup if the Roamio [edit: Plus or Pro] iwasn't somewhere you could use it to bridge between your home Ethernet or WiFi network and the MoCA network. In that case you'd need some other device (the MoCA adapter or router) to get your local network, with it's internet connectivity, onto the MoCA network for both the Roamio and Mini to consume.

 

The type of Roamio matters. 6-tuner Roamio Plus/Pro have built-in MoCA support. 4-tuner Roamio have no built-in MoCA.

 

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Good point. I'd forgotten about the 4-tune Roamio units: the Roamio OTA (over the air antenna only; so it makes sense not having MoCA as it doesn't support digital cable) and the base level Roamio (which can be set to to do either digital cable or OTA; which I'm a bit surprised to hear lacks MoCA support).

 

Except:

So, yeah, first thing to check/confirm is whether the Roamio has an Ethernet connection to the router (either directly or via a network switch).

Or maybe TiVo finally updated the software to support MoCA/WiFi bridging.

A MoCA/Ethernet bridge connected to a router’s LAN would necessarily bridge traffic for any devices WiFi-connected to the LAN, but no TiVo device directly bridges between MoCA and wireless — unless, as joked, something drastic has changed with a recent software update.

 

Of course, if you find that the DVR lacks an Ethernet connection to your router, it’s possible that both you and a neighbor lack MoCA filters at your cable signal points-of-entry (PoE) ... and both of your TiVo’s are MoCA clients to your neighbor’s MoCA network.

Do your TiVo boxes show up as clients in your TP-Link router? What are the IP addresses of your TiVo boxes, and how do those compare to the IP address range managed by your TP-Link router? What does the Mini’s Network Status dialog report for MoCA statistics (# of nodes, MAC addresses, etc)?

Can you stream any content from your Roamio to the TiVo app on your mobile device?

 

My guess is that the Xfinity modem is creating the MoCA which would make sense given that all devices are connected via coax.

 

Except:

Neither of these devices have a built-in MoCA bridge.

 

All Xfinity modems/gateways have MoCA now and it’s possible the poster does not realize it. Unless they are using a device that is 5+ years old.

 

See prior post quoting the OP, in which they list the model #s for their customer-owned modem and router. They don’t have a leased gateway.

 

Missed that point! Ok next possibility, could the modem and router be connected via an Ethernet cable? If that’s the case does the same bridging apply? The OP did not make it clear from my reading how the modem and router connect to each other.

 

The modem and router would necessarily be connected via an Ethernet patch cable, but that would only be to supply the router with the WAN connection. There’s no coax port on the router and there’s no LAN presence on the modem ... so no possibility of built-in MoCA bridging for the LAN.

It’s likely that the DVR *is* connected via Ethernet ... or a couple households are missing “PoE” MoCA filters.