Wireless Access

I have followed this http://community.arubanetworks.com/t5/Controller-Based-WLANs/How-do-I-redirect-guest-access-across-a-GRE-tunnel-to-a-DMZ/ta-p/183468  docs to configure DMZ for guest controller,

Here we are using master controller as auth server. Is there a way we can use DMZ controller as auth server ?

 

I cannot open that link.  You can make the DMZ controller do the authentication by making that side of the tunnel untrusted.  The benefit of making the controller that the AP terminates on authenticate the user is that the association and authentication table will have to user on the correct AP, authenticated with the correct name.  If you have the DMZ controller authenticate users, you cannot really track what AP that user is on.

Ok, is there anything else required, means any policy or something.
Or I just need to make the tunnel untrusted.

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Any users that pass through the "untrusted" side of the tunnel will end up in the logon role on the DMZ controller.  That means you need to create a captive portal authentication profile and edit the "logon" role to have that captive portal authentication profile on the DMZ controller.

 

Please see the post here:  http://community.arubanetworks.com/t5/Controller-Based-WLANs/How-do-I-redirect-guest-access-across-a-GRE-tunnel-to-a-DMZ/ta-p/183468

Start reading "Configure the DMZ Controller".  *The configuration for the DMZ controller has it natting the user traffic, but that is optional*