---
title: MAC Filtering Configuration
slug: kronpam-reference-guide-legacy-ui-3-4-0/mac-filtering-configuration
description: Learn about the significance of MAC addresses in RADIUS authentication in this informative document. Explore how users can exclusively utilize predefined MAC addresses, despite the possibility of multiple users being assigned the same MAC address. Discove
docTags: 
createdAt: 2022-08-01T12:33:45.000Z
---

If MAC addresses are defined for a user, that user can only use those MAC addresses. The same MAC address can be assigned to different users. Users cannot use undefined MAC addresses for RADIUS authentication. 

To activate MAC filtering while using 802.1x Authentication:

- Check the **MAC Filtering **box in the **Administration / RADIUS 802.1x Config** screen.

::Image[]{src="https://api.archbee.com/api/optimize/g9cApVza9NIhSh0pjZYtA/YR7myTStTploaaQ4vIrI9_image.png" size="74" width="855" height="430" caption="802.1x Mac Filtering" position="center" showCaption="true"}

1. Navigate to **Administration** > **MAC Filtering**.
2. Enter the username and user MAC Address to be allowed and click** Save.**



::Image[]{src="https://api.archbee.com/api/optimize/g9cApVza9NIhSh0pjZYtA/7ts-zLKWHddPKNZRTnRjT_image.png" size="74" width="855" height="426" caption="802.1x Mac Filtering" position="center" showCaption="true"}