Orbi 772 backhaul through MoCa

Anytime I see 6x splitters, I get a bit nervous. Most of them you see, aren't powered so they have significant signal reduction because its split. And if they are powered, not all of them are decent and can still corrupt the signal. I'd start with just going moca--->moca without an adapter/splitter. Run 1 of the orbi's off that and see if they backhaul stays stable. IF it doesn, then try using just a double splitter and seeing if the moca stays stable for the 2x orbi satellites. 

Moca does work as a backhaul. I've both seen it done and tested it myself. So it does work. 

So start by simplifying and taking the 6x splitter out and see what happens. 

Do you know if its a powered 6x splitter/amplifier or just a splitter? Got a model for it? 

What moca adapters are you using?  

manusjuhl​  I agree with plemans​ that bypassing the six-way splitter is a good test. Could you share, besides its make and model, which ports the three goCoax adapters use?

There’s one other idea I’d check. When the satellite worked with direct Ethernet, I assume it was plugged into a LAN port on the Orbi router? In the current setup, both Orbis connect separately to the TP-Link LAN through MoCA. If the direct test used an Orbi LAN port, it changed the network path as well as bypassing the splitter.

At the remote room, I’d temporarily replace the satellite with a laptop connected to that goCoax adapter. If the laptop gets an IP address from the TP-Link and maintains a reliable connection, the coax path is passing ordinary network traffic, and I’d investigate how the Orbi backhaul works through this arrangement. If it cannot get an address or the connection drops, I’d focus on the coax run, splitter, and MoCA link - the problem is likely there. The goCoax link rates, if available, would also be useful; a lit MoCA LED alone doesn’t tell us how well the connection is working.

Those tests should help separate a coax/splitter problem from an Orbi backhaul topology issue.

I will try tomorrow - I can put all of them in the same room. 
not sure if I understand the last bit. It’s important for me that the Orbi router is not placed where my fiber modem because of the general Wi-Fi coverage. 
B Manus

The moca adapters maybe blocking certain Orbi traffic between the RBR and RBS. May need to try a different kind or brand of MoCa adapters to check this.

As meantioned, check for good ethernet backhaul status with the RBS directly connected behind the RBR, should see WIRED here. 

Be sure that the RBS and moca adatpers are connected behind the RBR, then connect the RBS to one of the moca adapters that is connected behind the RBR. The RBS can't be connected in parallel to the RBR. Won't work.

Sorry, you cant interconnect what makes up your WAN and your LAN on the same network - mess is predictable...

To operate WAN (internet feed) and LAN (home network) traffic separately across your coaxial lines, your primary concern is preventing data loopbacks and protecting your network's security/performance.

Because WAN and LAN traffic must remain rigidly isolated to allow your router to do its job, how you approach this configuration depends entirely on your home's physical wiring.

Scenario A: You Have Separate Coaxial Runs (Highly Recommended - not what oyu want, tough...)

If you have access to your central junction box where all room coaxial lines meet, you should opt for physical isolation. This provides the best stability and guarantees maximum performance.

1. Isolate the Coax Paths: Inside your utility panel, disconnect the two rooms being used for the WAN link from the rest of the house. Use a standalone 2-way MoCA-compatible splitter (or a simple barrel connector if it's a direct room-to-room run) to connect only those two points.
2. Connect the Remaining Rooms: Connect all the remaining rooms designated for your home network to a separate multi-way splitter.
3. The Configuration: Keep all four goCoax MA2500D adapters at their factory-default settings. Since the signals cannot physically cross paths, pair one will securely handle your raw internet feed (WAN) and pair two will handle your home internet distribution (LAN).

Scenario B: Everything Must Share a Single Coaxial Network (Frequency Splitting)

If all your coaxial jacks must remain wired to the exact same central splitter, you cannot simply rely on the default settings or MoCA privacy passwords. If you do, your router's WAN port and LAN port will accidentally be bridged together over the MoCA mesh, crashing your network.

To resolve this on a shared cable, you must configure the pairs to operate on completely different frequency channels via the goCoax web interface:

1. Access the Adapter Settings: Unplug your adapters from the coax network. Connect a computer via Ethernet directly to one adapter, change your computer's static IP address to 192.168.254.10, and navigate to http://192.168.254.254 in your browser.
2. Configure Pair 1 (WAN): Log in (Default: admin / pps2020 or check the sticker on older units). Change the operational frequency mode to D-Band Low. Apply changes and restart. Repeat this for the second WAN adapter.
3. Configure Pair 2 (LAN): Log in to the remaining two adapters and change their frequency mode to D-Band High. Apply changes and restart.
4. Reconnect to Coax: Once reconfigured, you can plug all four back into the shared home coax. The WAN pair will only communicate on the lower frequencies, and the LAN pair will only communicate on the higher frequencies. 

Note: When splitting the spectrum this way, the maximum available bandwidth per pair drops from 2.5 Gbps to roughly 1 Gbps for WAN (1 channel) and 1.5–2 Gbps for LAN (3 channels), which is still plenty for most residential setups.

Stating that much: I don't have any current MoCa devices - key reason is that modern Cable TV network infastrcures here in old Europe don't have any spare bandwidth - plugging MoCa to a modern Cable TV network would cause another mess - for the other subscribers, and for you.

ISP CPE (likely a NAT router, and including WiFi too), plus yet Another TP-Link AC1200 Router (another NAT router and WiFi) - and everything seamlessly connecting each router WAN and LAN again over the single MoKa network.... 

Looks like some natural grown network infrastructure, with plenty of predictable (and some very obvious) problems.

As someone already suggested, disable any NAT in the ISP CPE (make it a pure Internet bridge). What purpose sgult that TP-Link router have?

Hi all,

Thanks for all the great ideas. This will take me some time but I will start from the top and reply you all with my findings. 

I will keep you posted.

Thanks once again.

Br Manus

A short update:

I have changed the splitter to a new 2 splitter instead of the 6-splitter.

I have moved the router right to the fiber modem and I disconnected the TP-link - this didn't work, so I connected it again so I have internet through the router. I'm really happy for all your help, but for now it dosen't seem to be the right solutions yet.

Br Manus

manusjuhl wrote:

I recently purchased a new mesh system (Netgear Orbi 772) consisting of one router and one satellite.

FWIW, one option is to return the Orbi and instead buy two WiFi-7 extenders that can work as access points.  Then you could use a 2-way splitter, connecting the TP-Link to room 1 and room 2 using D-Band Extend.   The Netgear EXS27 would work for this.   This lets you use existing wiring and your three MoCA adapters, and it would deliver your full ISP speed to both rooms.

Which TP-Link model do you actually have?  (AC1200 is a wifi speed, not the actual router model)?