Can someone exactly clarify the mechanisam involved in guest accessing Internet ?
How does he ge automatically get the config parameters such as proxy address atc ?
"It Depends" to use a quote from Neil Reid. You can configure guest access several ways. The mobility controller anchor methd is one of the most commonly used. This requires you to configure a guest ssid that utilizes a mobility anchor controller that resides outside the firewall. The traffic on this ssid is tunneled to the mobility anchor controller on an EoIP tunnel. Refer to the Mobility Anchor Configuration guide
Yes, this requires a dedicated controller but is the most effective method.