A request from a user of a computer device to gain access to a communication network is routed to a captive web portal running on a Dynamic Host Configuration Protocol (DHCP) server where the device has a media access control (MAC) address that is not known to the DHCP server, rather than being routed...http://www.google.fr/patents/US7542468?utm_source=gb-gplus-shareBrevet US7542468 - Dynamic host configuration protocol with security
