Guest authentication

4402 Wireless LAN Controller
Software Ver. 4.2.207.0
Some help please, I have a guest network configured and working as expected, we have a guest WLAN, a guest Vlan and an ACL. When I create a Guest account they are able to authenticate and gain access to the outside world, however, I have found that our internal users are also able to use this guest WLAN by using their regular accounts that is managed via RADIUS server authenticating to an LDAP server. Can any one tell me how the make sure that only guest accounts have access to the guest WLAN?
I have gone through many papers and articles on the web but so far now luck finding a solution. I did see in some documentation that when a user tries to authenticate they will use one method first and if they fail they will try another i.e. local account and then RADIUS.
Any help would be greatly appreciated.
Murray

So I have found the solution to my problem. After reading a document that outlines the order in which guests are authenticated I found that by changing the global Radius configuration as shown below prevents our regular users from accessing the Guest network with their network accounts.
FYI this is what I found.
Q. What occurs when a guest logs on?
A. When a wireless guest logs in through the web portal, the guest anchor controller handles the authentication by performing these steps:
The guest anchor controller checks its local database for username and password, and if they are present, grants access.
If no user credentials are present locally on the guest anchor controller, the guest anchor controller checks WLAN configuration settings to see if an external RADIUS server(s) has been configured for the guest WLAN. If so, the controller creates a RADIUS access-request packet with the username and password and forwards it to the selected RADIUS server for authentication.
If no specific RADIUS servers have been configured for the WLAN, the controller checks its global RADIUS server configuration settings. Any external RADIUS servers configured with the option to authenticate “network user” will be queried with the guest user’s credentials. Otherwise, if no servers have “network user” selected, and the user has not been authenticated through steps 1 or 2, the authentication will fail.

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                   Handle:  0x3E00018B
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           dot1x    Failed over
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