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Microsoft NPS as a RADIUS Server for WiFi Networks: SSID Filtering

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The Microsoft Network Policy Server (NPS) is often used as a RADIUS server for WiFi networks. It can provide authentication and authorization services for devices and users on a wireless network in a Windows Active Directory environment.
In this article we look at how we can use NPS to provide authentication for WiFi users across a number of SSIDs.
We have previously discussed how to authenticate groups of users using the same SSID and then assign them to a VLAN that is appropriate to their security authorization. However, there may still be instances where two or more SSIDs are in-use on a wireless network and we would like to base policy decisions on the SSID that the authentication request is being generated from.
As an example, if we consider a school, perhaps we would like students to only be able to authenticate if they connected to the SSID: "Student_Net". Similarly,  staff should only be able to connect using the SSID: "Staff_Net". This would prevent any stude…