How do you configure a RADIUS server for WLAN authentication and authorization?

1 Install and configure a RADIUS server

The first step is to install and configure a RADIUS server on a computer that is connected to your network. You can use any RADIUS server software that supports the IEEE 802.1X standard, such as FreeRADIUS, NPS, or IAS. You will need to set up the basic parameters of the RADIUS server, such as the IP address, port, and shared secret. You will also need to create a database of users and groups, and assign them different roles and permissions.

2 Configure the WLAN access point

The second step is to configure the WLAN access point (AP) to use the RADIUS server for authentication and authorization. You will need to log in to the AP's web interface or console, and enable the 802.1X or WPA2-Enterprise mode. You will also need to specify the IP address, port, and shared secret of the RADIUS server, and choose the appropriate encryption and authentication methods, such as EAP-TLS, PEAP, or TTLS.

3 Configure the WLAN client

The third step is to configure the WLAN client to use the RADIUS server for authentication and authorization. You will need to access the network settings of the client device, such as a laptop or smartphone, and select the WLAN network that uses the RADIUS server. You will also need to provide the credentials and certificates that match the ones stored in the RADIUS server database, and choose the same encryption and authentication methods as the AP.

4 Test the connection

The fourth step is to test the connection between the WLAN client and the AP, and verify that the RADIUS server is working properly. You can use a ping command or a web browser to check if the client can access the network resources. You can also use a RADIUS log or monitor tool to see if the server is receiving and processing the authentication and authorization requests from the AP and the client.

5 Troubleshoot any issues

The fifth step is to troubleshoot any issues that might arise during the configuration or testing process. Some common issues are: mismatched encryption or authentication methods, incorrect IP address or port, wrong shared secret, expired or invalid certificates, missing or incorrect credentials, or firewall or network interference. You can use diagnostic tools or error messages to identify and resolve these issues.

6 Maintain and update the RADIUS server

The sixth and final step is to maintain and update the RADIUS server regularly. You will need to backup the server database and configuration files, and restore them in case of any failure or corruption. You will also need to add, modify, or delete users and groups, and change their roles and permissions as needed. You will also need to update the server software and security patches, and monitor the server performance and activity.

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?