There's no way to have RADIUS (I suppose you were thinking of "Framed-IP-Address") assign a fixed IP address to a wireless client
- not, at any rate, with a Cisco autonomous IOS AP or WLC.
The AP / WLC is (basically) a layer 2 device, while assigning an IP address is a layer 3 operation.
Theoretically (if you were doing EAP authentication), you could set up the WLC as a DHCP server, and then have RADIUS send down the Framed-IP-Address value to the WLC, and then the WLC's DHCP server could provide that address to the client. But we don't support that, and in any case, that can't work with a web auth client, which must get its IP address from DHCP *before* it does the web auth. (Can't do web without an IP address.)
Now, if you know the client's MAC address, you could set up static bindings to fixed IP addresses in your DHCP server (the WLC DHCP server doesn't support this, but many/most DHCP servers, including IOS's do.)
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