In this paper, the authors present the development of a one-to-many reversible mapping mechanism simulation for IPv6 address generation. This paper mechanism is to improve IPv6 addresses generation in terms of privacy and security in an enterprise Local Area Network (LAN). Each time a user accesses a network, a dynamic IPv6 address is assigned via the DHCPv6 (Dynamic Host Configuration Protocol for IPv6) server. The dynamic address (one-to-many mapping) is to protect a user from unwanted behavior analysis attempting to exploit IPv6 addresses, thus protecting user privacy.