IPv6: Dual-stack strategy starts at the perimeter
Even though IPv6 has been standardized for many years, there is a general lack of knowledge and experience with IPv6, and now many enterprises are starting to realize the bind they're in
We are in an awkward point in the history of the Internet. IPv4 address depletion has occurred yet we expect to use IPv4 for the next 15 to 20 years. Organizations see two paths before them. One alternative is to use continue to use IPv4 and expect to use multiple layers of network address translation (NAT) for many years to come. The other alternative is to start to use IPv6, however, the majority of enterprise organizations and content providers have not embraced the protocol.
U.S. federal organizations should be working on meeting the September 2012 Office of Management and Budget (OMB) mandate to IPv6-enable all government Internet-facing web applications. The glacial speed of the federal government combined with government budget issues makes it difficult for them to meet "yet another unfunded IPv6 mandate".