Some network-related parameters for a Windows Vista-based or Windows Server 2008-based DHCP client computer are configured incorrectly when you use DHCPv6
In a network environment, you deploy the Dynamic Host Configuration Protocol version 6 (DHCPv6) solution. This solution uses Internet Protocol version 6 (IPv6). However, on a Windows Vista-based or Windows Server 2008-based DHCP client computer, you may find that some network-related parameters are configured incorrectly. Therefore, you cannot access the network correctly.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB953268.