By configuring a username and password in the accesspoint for example. That way the NAS sends an access-request with the username and password to the radius server. The radius server can then 1) uniquely identify the accesspoints, 2) reject unknown accesspoints, 3) give the accesspoint the configuration it needs
Wellll....i don't think these APs work like that. They're more like relays than anything else - the customer premises equipment (a wireless network card of varying types) tries to associate with the AP (running in open, non-encrypted mode and broadcasting an SSID). The AP gathers the MAC address of the cust. prem. device that's trying to associate with it and passes that information to RADIUS, using the two different methodologies I mentioned previously. If it gets a Reject, the customer device doesn't get to associate. If it gets an Accept, then it looks for bandwidth limits from RADIUS and implements them after it allows the device to associate.
Oh boy, it's the CLIENT that you're trying to authenticate.
The AP only sends the MAC of the client, so that's about the only thing you can check to distinguish the users.
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