A router obtains a network address generated by a PC connected to a LAN, and the identification data (MAC address) unique to the PC. When the obtained network address does not match the network address (EUI-64) generated from the obtained identification data unique to the PC according to a predetermined...http://www.google.de/patents/US7512709?utm_source=gb-gplus-sharePatent US7512709 - Address restriction method, address restriction program, and address restriction apparatus
