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DHCP (dynamic host configuration protocol) makes it easy to access an IP network. However, since the DHCP itself does not have an access control, illegitimate users inside a network segment can easily abuse inside or outside the network. Therefore, we have introduced an authentication scheme and access control into the DHCP system. Using a popular authentication by MAC (media access control) address, a user cannot utilize an IP address except on the MAC address' machine. We propose user authentication and access control for the DHCP system and demonstrate its security.