Moving to IPv6 will present a number of challenges for the U.S. federal government, not the least of which is the associated price tag, which could hit $75 billion. A new 63-page report issued late last week by the IPv6 Summit and Juniper Networks offers U.S. federal agencies a bevy of suggestions on how best to go about transitioning to IPv6. The government is supposed to be on a relatively rapid path toward IPv6 migration since the Office of Management and Budget (OMB) mandated (PDF file) this past August that the federal government move to IPv6 by June 2008. Last week’s report, titled “IPv6 Best Practices World Report Series: Guide for Federal Agencies Transitioning to IPv6,” recommends that federal agencies develop a business case for moving to IPv6, centralize their migration tactics and define metrics to help track transition progress.