Over the last decade, IPv6 has established itself as the most mature network protocol for the future Internet. While its acceptance and deployment remained so far often limited to academic networks, its recent deployment in both core networks of operators (often for management purposes) and its availability to end customers of large ISPs demonstrates its deployment from the inside of the network leading to the edges. For many enterprises, the transition remains an issue today. This remains a tedious and error prone task for network administrators. In the context of the Cisco CCRI project, we aim at providing the necessary algorithms and tools to enable this transition to become automatic. In this report, we present the first outcome of this work, namely an analysis of the transition procedure and a model of target networks on which our automatic approach will be experimented. We also present a first version of a set of transition algorithms that will be refined through the study.