Internet access everywhere has become a reality today, largely thanks to the deployment of numerous WiFi hotspots. However, controlling user access to the network remains a challenge because of the need for specific hardware and the lack of software standards. Using the OpenFlow protocol, we provide a new extensible way of designing and managing guest access architectures in the Cloud. We demonstrate the feasibility of such an architecture, with little impact on existing configurations when using virtual machines and Software Defined Networks. Our results can be used to build a real life testbed to test new mutualized guest access network architecture and improve hardware interoperability.