This paper reports both the design and implementation of an IPv6 network for easy and efficient transition from IPv4. A model that has a native IPv6 network in the central office of a corporate network using transitional mechanisms for the connection into an IPv4 Internet, IPv6 Internet, and remote offices is implemented. This is intended to offer a viable alternative for implementing IPv6 natively, without losing access to IPv4 services and incurring the disadvantages of other approaches in terms of both management and security requirements, inherently present in the simultaneously operation of IPv4 and IPv6. The GNS3 software integration with VirtualBox represents a tool that allows testing within a single computer to validate each of the steps in the process of migration to IPv6, without disrupting an operating IPv4 network.