A WiFi network structure based on the extensive use of three levels of NAT is introduced. Such a system has been designed to avoid complex or proprietary roaming strategies and to keep very simple the system setup and configuration. Design constraints are related to the system scalability, to the transparency with respect to the actual in service network, to the possibility of offering location based service and to simply support mobility and in general access point handover. The proposed system has been implemented in the University of Ferrara campus and it is actually running. Some results regarding the first period user penetration and the system effectiveness are shown.
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