Personal computers are getting much smaller and easier to carry about in these days. LAN sockets providing network ascessibility for those mobile computers axe often Set in public places the libraries, computer centers, and so on. However, it is difficult to prevent illegal access to networks in such cases. In this paper, we propose a protection method to cope with illegal access. Our method provides the following functions: (1) only valid users can access to the network, (2) preventing malicious users from invalid use of the network by IP and/or MAC address spoofing, and (3) no need for pre-registration of IP and/or MAC addresses. We have implemented this method as a system named LANA. The design and implementation of LANA are also discussed.
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