I have a virtual controller, which is with IOS version 8.3.102. My Wlan guest started having user authentication problems. I removed and created a new Wlan. Now users connect and authenticate to the new guest network, but they do not get IP from the Guest 10.1.42.X / 24 network, they get IP from the AP 10.1.10.X / 24 native network. The other WLANs are OK.