Hi,
there is nothing such as "Wireless Nac appliance".
The question is "do you have the NAC Guest Server" or the "Nac appliance Server and Nac appliance Manager (CAS/CAM)" ?
Because those are just not the same at all.
Then on the wireless side, do you have autonomous APs or a WLC ?
Sorry to ask, but there's just so many possibilities you could be asking that we need to clarify.
My bet is that you are either looking for this :
http://www.cisco.com/en/US/partner/products/ps6128/products_configuration_example09186a0080a138cc.shtml
or for this :
http://www.cisco.com/en/US/partner/docs/security/nac/guestserver/configuration_guide/20/g_hotspots.html#wp1092277
Nicolas
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