Connect your Deco to AT&T Fiber by putting the main Deco unit in bridge mode and connecting it to your AT&T gateway with an ethernet cable

AT&T Fiber comes with a gateway that handles your internet connection. Your TP-Link Deco mesh system works best when it sits between that gateway and your devices, but AT&T's gateway already broadcasts wifi. The solution is to turn off the gateway's wifi and let your Deco handle all the wireless coverage instead. This takes about ten minutes and requires one ethernet cable.

The reason this matters: AT&T's gateway is designed to cover one room well. Deco is designed to cover your whole house. If both broadcast at the same time, your devices get confused about which one to connect to, and your speeds drop. Putting Deco in bridge mode tells it "I'm not the main router, just extend the network," and everything works together instead of fighting.

Key Takeaways

  • You need one ethernet cable to connect your AT&T gateway to your main Deco unit; wifi alone will not work for the initial setup.
  • Bridge mode turns off Deco's router functions so your AT&T gateway stays in charge of your internet connection and security settings.
  • You must disable wifi on your AT&T gateway after Deco is set up, or your devices will switch between networks and lose speed.
  • Deco satellite units connect to the main Deco unit wirelessly and extend coverage to dead zones without needing cables to the gateway.

What you need before you start

Gather an ethernet cable (any length that reaches from your gateway to where you want the main Deco unit), your Deco system, and the phone or computer you will use to set it up. You do not need the Deco app yet — the web browser works fine for bridge mode setup.

Locate your AT&T gateway. It is usually a white or black box with lights on the front. Write down the wifi network name and password from the sticker on the back or bottom — you will need these to reconnect your phone or computer during setup. If you cannot find the password, you can reset the gateway, but that takes longer.

Step 1: Connect Deco to your AT&T gateway with a cable

Unplug the power from your main Deco unit. Take an ethernet cable and plug one end into any port on the back of your AT&T gateway (not the port labeled "Internet" or "WAN"). Plug the other end into the port on the back of your main Deco unit labeled "Internet" or "WAN" — it is usually a different color than the other ports.

Plug the Deco back in and wait for the lights to stop blinking. This usually takes two to three minutes. The light should turn solid blue or white, depending on your Deco model. If it stays red or orange, unplug it, wait ten seconds, and plug it back in.

Step 2: Open Deco's web interface and switch to bridge mode

On your phone or computer, open a web browser and type 192.168.0.1 into the address bar, then press Enter. You should see a Deco login page. If you have not set up this Deco unit before, the default username is admin and the default password is admin. Log in.

Once you are logged in, look for a menu option called Advanced, System Settings, or Operation Mode. The exact name varies by Deco model, but it is usually in the left sidebar. Click it. You should see an option for Router Mode or Access Point Mode (some models call bridge mode "Access Point Mode"). Select Access Point Mode or Bridge Mode. The system will ask you to confirm — click yes. It will restart.

Wait three to five minutes for the Deco to restart. The light will blink, then turn solid again. Do not unplug it during this time.

Step 3: Reconnect your devices to the AT&T gateway

Once the Deco light is solid, go to your phone or computer's wifi settings. You should now see your AT&T gateway's network name (the one from the sticker on the back). Connect to it using the password from the sticker. This is temporary — you are just confirming the gateway still works.

Open a web browser and go to 192.168.0.1 again. You should see the AT&T gateway login page this time, not the Deco page. This confirms that Deco is now in bridge mode and the gateway is back in charge. If you see the Deco page, the mode change did not take. Unplug the Deco, wait ten seconds, plug it back in, and try again.

Step 4: Turn off wifi on your AT&T gateway

While you are logged into the AT&T gateway at 192.168.0.1, look for Wireless, WiFi Settings, or Network Settings in the menu. Find the option to turn off the gateway's wifi broadcast. The exact steps vary — some gateways have a toggle switch, others have a checkbox. Turn it off and save. The gateway will restart.

If you cannot find this setting, look for a physical button on the gateway labeled "WiFi" or with a wifi symbol. Hold it for three seconds. The wifi light on the front should turn off. This does the same thing as the web setting.

Step 5: Set up Deco's wifi network

Once the gateway has restarted, disconnect from the AT&T network. read the TP-Link Deco app on your phone from the App Store or Google Play. Open it and tap Add Device or Set Up New Device. Follow the prompts to create a new wifi network name and password. This is the network your devices will connect to from now on.

The app will guide you through connecting your main Deco unit. When it asks about your internet connection, select Ethernet or Wired — this tells Deco it is getting internet from the cable connected to your gateway. Complete the setup and your main Deco unit is ready.

Step 6: Add satellite units if you have them

If your Deco system came with satellite units, plug one in near the edge of where your main Deco's signal reaches well. Wait for its light to blink. Open the Deco app, tap Add Device, and select Add Deco. The app will find the satellite and walk you through connecting it. Repeat for any additional satellites.

Satellites do not need ethernet cables — they connect to the main Deco unit wirelessly. Place them in rooms where you have weak signal, but not so far away that they cannot see the main unit. A hallway or bedroom usually works well. Avoid closets or corners.

Frequently Asked Questions

Do I have to use bridge mode, or can I use router mode instead?

You can use router mode, but it creates problems. In router mode, Deco becomes a second router on your network, and your AT&T gateway is still a router too. Your devices will jump between them, your speeds will drop, and port forwarding and parental controls become complicated. Bridge mode is simpler and faster.

What if I cannot find the bridge mode setting on my Deco?

Older Deco models use different menu names. Look for Operation Mode, Access Point Mode, Extender Mode, or Repeater Mode. If none of these exist, your model may not support bridge mode — contact TP-Link support with your model number. You can find the model number on the bottom of the unit.

Can I use wifi to connect the main Deco to my gateway instead of an ethernet cable?

Not for the initial setup. Deco needs a wired connection to the gateway to switch into bridge mode reliably. Once it is in bridge mode and working, you can remove the cable if you want, but keeping it connected gives you faster, more stable internet.

What if my devices will not connect to the new Deco network after setup?

"Forget" the old AT&T network on your device. Go to your phone or computer's wifi settings, find the AT&T network name, and select Forget or Remove. Then scan for networks again and connect to your new Deco network name using the password you created in the app.

Will I lose internet if I turn off the gateway's wifi?

No. Turning off the gateway's wifi only stops it from broadcasting a wireless signal. Your internet connection stays active through the ethernet cable to Deco. Your devices will connect to Deco's network instead, which is connected to the gateway by cable.