Official How to set up Ethernet Backhaul with your Deco devices

Ethernet Backhaul is a feature that makes it possible to wire the Deco units together.
Thanks to this feature, every two Deco units can be wired with an Ethernet cable. And Deco will transmit data between the two units through the Ethernet connection, which is more stable and faster than Wi-Fi. Once Ethernet backhaul is established, the Wi-Fi backhaul connection will disconnect automatically.
Here are two typical connection structures for Ethernet Backhaul:
Notes:
1. Please note that the main Deco unit will act as a NAT router by default.
2. Please add the Deco units on the same network at first through the Deco app before you wire them together.
3. Please make sure there aren't any other DHCP servers behind the main Deco. Otherwise, it will cause the second and third Deco units to obtain an invalid IP address that doesn't have internet access.
4. If you have switches on the network and find Ethernet Backhaul not working, please check the management IP address of your switches. It's possible that some switches adopt 192.168.0.1 (which is the same as the LAN IP address of the main Deco) as the management IP, which may cause some conflicts on the network. In this case, it's recommended to change the management IP address of switches to another subnet.
Frequently Ask Questions
Q1: Can I connect all the Deco units directly to my home modem/router?
* In Router mode
Only the main Deco could be connected to your home modem/router. Other slave Deco units should be connected behind the main one, just as the Star Network shows. If not, they may be in a network loop and cause unexpected dropout issues.
* In Access Point mode
You can connect all the Deco units directly to your home modem/router/switch as you want. The system will work as expected.
Q2: How to turn on the Ethernet Backhaul feature?
No need to switch on this feature manually.
Just add your Deco units in the same Deco network and wire them together as per the above network structure. Then Ethernet Backhaul will take effect automatically.
Q3: How do I know if Ethernet Backhaul takes effect?
Launch the Deco app, tap on "Internet". Then tap on the slave Deco unit which is wired to other Decos and you can see its backhaul status.
Q4: To use the Ethernet Backhaul feature, do I need to wire all my Deco units?
Nope. You can set up one for wireless backhaul, and the other one for Ethernet backhaul as what you want.
For example, if you have three Deco units and want to create Wi-Fi not only in your house but also in the garage, which is a little far from the house and without Wi-Fi coverage. Then you can put the main Deco and slave Deco 1 in your house (wireless backhaul). As for slave Deco 2, you can place it in the garage with a long Ethernet cable connected to the main or slave 1 unit. In this case, the slave 2 unit will work through Ethernet backhaul, while the main and slave 1 will work through wireless backhaul.
Q5: Why my Decos become unstable once they're connected via a switch?
It's probably that you're using a D-Link switch.
The Deco Ethernet backhaul feature is based on the standard IEEE 1905.1 protocol. However, we find that some D-Link switches will not forward packets based on IEEE 1905.1 protocol, causing all Deco units in a loop and become quite unstable. If you have a D-Link switch and encounter unstable issue with Ethernet backhaul, we recommend to change another brand of a switch or contact D-Link support directly for a fix.
If you're not sure which switch to use, TP-Link switches may be a good choice.
Q6: Can I set up Ethernet Backhaul through a powerline connection?
That's okay if the powerline connection doesn't block any data flow.
Typical topology is, modem ---- main Deco ---- Powerline unit~~~Powerline unit ---- slave Deco
Q7: Can I set up different Deco models such as M5 and M9 Plus together through Ethernet backhaul?
Yes, just configure and add different Deco models in the same Deco network. After that, you can wire them to set up the Ethernet backhaul connection.
You could refer to the link below for how to add different Deco models in the same network.
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TP-Link Deco wrote
@santoshhyadav
Have you tried to connect the second Deco directly to the LAN port of the main one? Will it work in this case? If yes, it seems an issue between Deco and the switches. Try to change the management IP address of the switches for a check.
Need to clarify that you need to firstly set up the three units in the same network via the Deco app before you use the Ethernet Backhaul features.
Is simply changing the IP address sufficient (say to 192.168.0.3), or does the subnet (subnet mask?) need to be changed, as stated in Note 4 in the original post?
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TP-Link Deco wrote
Ethernet Backhaul is a feature which makes it possible to wired the Deco units together.
Thanks to this feature, every two Deco units can be wired with an Ethernet cable. And Deco will prefer to transmit data between two units through the Ethernet connection, which is more stable and faster than Wi-Fi.
Here are two typical connection structures for Ethernet Backhaul:
Hi. I am about t purchase a Deco set, and want to check my understanding of the Ethernet Backhaul feature.
But firstly, Q1: Does the Deco system somehow ‘encourage’ devices to use the best Deco unit, e.g when moving around the house?
(With my current collection of routers/APs/extenders, my devices seem to hang on as long as possible to even the weakest of signals, before eventually changing to a much stronger one... often long after the throughput has dwindled to almost nothing!)
Then Q2: When configured as in the first post in this thread (either daisychain or star) rather the pure wireless mesh, will this feature still work - e.g. will devices still be actively encouraged/forced use the best Deco Wi-fi signal?
Thanks
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Guest network works just fine under ethernet backhaul. I really fail to undertand these problems you guys are having. This setup is really as simple as it can possibly be.I run 3 Deco units. The primary one is connected to my modem via ethernet. Off of the second port of that Deco, I have an 8 port Netgear gigabit switch. Connected to that switch I have another 8 port gigabit switch (Yes, I know. But I have alot of wired connections). From there I have an ethernet cable which runs to the farthest room if my house connected to another 5 port Netgear gigabit switch. Off of that switch I have my second Deco, and a wired computer. My third Deco is running in pure wireless mode. I set them up all on wireless first, and then put them in the places I wanted them, and everything runs super. The oy quibble I have, is DHCP reservation is not always assigning the appropriate I.P. addresses configured, but I am sure I will get that figured out soon enough.Muggost wrote
@TP-Link, you should make an amendment to the frist post in this thread: you need to let your customers know that guest network does not work when running Ethernet backhaul.
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No, guest network does not work fine with Ethernet backhaul. They do, in fact, not work at all, as stated by TP-Link customer service. See one of my other posts on this forum:Kienzlenator wrote
Guest network works just fine under ethernet backhaul.
http://forum.tp-link.com/showthread.php?101985-Guest-network-problem-(still...)
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I can assure you that you are wrong. I have my system on ethernet backhaul and currently have 12 devices connected to my guest network that work just fine. I suspect that either you have yet to update your firmware, or you are a troll that does not actually own the system and are just here to complain. Either way, it seems this system isn't for you so I suggest you return it and buy a different system and leave those of us who happen to enjoy it to use the forums without your negativity.Good day.Muggost wrote
No, guest network does not work fine with Ethernet backhaul. They do, in fact, not work at all, as stated by TP-Link customer service. See one of my other posts on this forum: http://forum.tp-link.com/showthread.php?101985-Guest-network-problem-(still...)
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For internet this is fine, but what if I need my phone to connect to a device on my main network. Will the first Deco that's acting as router and NATing allow my phone to talk to my Sonos which is wired?
I guess I could do this :

eg, plug my wired devices into the first TP Link but then I would be double NATing and I suspect that somethings that require a connecting to a device from the internet would not work due to the double NAT, this would create an issue for gaming.
I cannot setup my router in bridge mode as its provided by Sky and it's not got many features.
Many thanks
Steve
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