(Blacklist) approach via the mobile app, newer firmware updates for some hardware versions have introduced more robust Wi-Fi Access Control Allow Lists (Whitelisting). Methods for MAC Address Filtering 1. Using the TP-Link Deco App (Recommended)

: Launch the TP-Link Deco app on your smartphone.

Before we dive into the clicks and swipes, let's clarify the terminology.

Newer firmware for Deco units often includes a dedicated "Wi-Fi Access Control" module under the Security tab. www.tp-link.com Open the Deco app and navigate to the Wi-Fi Access Control module (visible only if all units support it). and choose: Block List Mode : Prevents specific MAC addresses from connecting. Allow List Mode : Only devices on this list can connect. Guest Network Exception

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Confirm the action. The device will be disconnected immediately and prevented from re-joining. Method 2: Manually Adding a MAC Address to the Blacklist

The Deco app interface does not have a simple "Add MAC Address Manually" button in the Blocked List menu. You must use the Network Map feature via the web interface.

Before you begin, you must understand a critical limitation of the Deco M4 firmware compared to older traditional routers:

A MAC (Media Access Control) address filter is a security feature that allows you to specify which devices can connect to your network based on their unique MAC addresses. By adding a device's MAC address to the filter list, you can either allow or block that device from connecting to your network.

, you can enable "Guest Network Exception" to let guests connect to your guest Wi-Fi without needing to add them to your main whitelist. Firmware Updates

Here is a comprehensive guide on how the Deco M4 manages device permissions, how to block unwanted users, and why this method protects your mesh ecosystem. Understanding MAC Filtering on the Deco M4

You can set this up either via the (recommended) or the Web Management interface . Method 1: Using the Deco App

Tap or Add to Block List . The device will lose internet access instantly. Method B: Block an Offline Device Manually Go to More > Block List . Tap the + (Add) icon in the top right corner. Select Add MAC Address .