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user_7o6mr4
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Friday, January 9th, 2026 2:01 AM

Setting up TPLink Deco S4 1900 with my Xifinity router

Hi, 

I bought 3 used TP-LINK Deco S4 1900 series units to enhance my home network. 

This is what I have done so far, but failing at one point. 

#Accessed Xfinity router Admin page and enabled Bridge Mode.

#Connected one Deco to an Ethernet port (2) of the Router.

#Restarted the Router

#Restarted the Deco

#Tried setting up the Deco. 

# I could create the Master Deco and added SSID .

That moment the Deco goes offline and shows RED . 

I tried resetting the Deco and repeated the process. No Go.

# I connected my laptop to the Xfinity (Bridge Mode ) router. 

I am getting internet. No issues. 

# Swapped the LAN ports.

#Swapped the Network cables / Still no go.

#Google says S4 Deco is compatible with Xfinity. 

What am I missing here ? I see DHCP & Routing  is automatically disabled when we enable the BRIDGE mode.

Any help ?

[Edited: "Personal Information"]

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9 hours ago

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XfinityMatthew

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9 hours ago

Hello user_7o6mr4, once bridge mode is enabled the next steps should be:

Step 2: Set Up Your Deco S4 (Router Mode First)
  1. Connect Main Deco: Connect one Deco S4 unit to the Xfinity Gateway's LAN port with an Ethernet cable.
  2. Download App: Install the TP-Link Deco app on your phone.
  3. Follow App: Open the app, create an account, and follow the prompts to set up a new Deco system. It will detect the Xfinity modem and guide you through creating your mesh network (SSID & password).
  4. Initial Setup (Router Mode): Complete the setup as prompted by the app, which might initially run the Deco in Router Mode. Add your other Deco nodes wirelessly.

Switch Deco to Access Point (AP) Mode:

Open Deco App: Go to More > Advanced > Operation Mode.
Select AP Mode: Choose "Access Point (AP) Mode" and confirm. This makes the Deco extend the Xfinity network's Wi-Fi instead of creating a new one.
Check Settings: Ensure the Xfinity Gateway's DHCP server is still enabled (it usually is by default even in bridge mode), as the Deco will rely on it for IP addresses. 

 

If you are still having issues this article may also be helpful. 

https://www.xfinity.com/support/articles/releasing-and-renewing-ip-address

 

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