Modern PCs are becoming increasingly small and portable. To provide network access for such mobile PCs, LAN connection points are appearing in public places such as libraries. However, it is difficult to prevent unauthorized network access from these LAN connection points, and it is especially difficult to protect against network attacks that are based on IP and/or MAC address spoofing. In this paper, we propose a protection method against unauthorized network access. Our method, utilizing LAN switches with VLAN tagging features, allows only authorized users to access to the network, records users' network activities, and prevents IP/MAC address spoofing.
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