The deployment of IPv6 has been a very slow process. However in the last months, very important signs of the progress are appearing, demonstrating that is no longer an utopia, but a fact, which just follows a natural process, equivalent to the take-off of any other new technology.

One of the main issues has been the "chicken and egg" paradigm. The lack of ISPs offering IPv6 services doesn?t help to application developers to consider IPv6 in their projects. Simultaneously, the lack of applications means that ISPs don?t have a requirementfrom customers to offer the service.

As a consequence, users don?t feel the need for IPv6 and even it can become a challenge to move forward to it when considering big networks.

However, already a few examples of large networks, real production networks which can?t disrupt the service, are available, one of them being described in this document.