I saw your other post and you can ignore that, since you have an unmanaged switch. No matter what you do, all traffic will be dumped out the ap to you lan. This is due to the fact that you can't create a trunk between the ap and the switch which will allow you to have multiple vlans. If you only need guest access in a certain location, you can just add an access point and set that up to go out to a dsl or broadband connection.