A great 2008 IPv4/IPv6 update by Jeff Doyle

2008 was sort of a milestone year for IPv6. Foremost there was the much-touted US OMB Mandate which everyone got excited about back about 2005: By June of this year all federal agencies’ “infrastructure (network backbones) must be using IPv6 and agency networks must interface with this infrastructure.” In the years between that mandate and the deadline, however, the language and requirements slipped significantly.
[via NetworkWorld - Cisco Subnet - Jeff Doyle]
