

Whenever a client receives an Advertise message of 255, it will immediately proceed with the DHCPv6 message exchange process. If you have multiple DHCPv6 servers, the Preference setting tells DHCPv6 clients which server to use. You can change the Preference of the scope to 255 to make IP address assignments a bit quicker.

Right-click the IPv6 node in the DHCP management console and then click "New Scope." After specifying a name for the scope, you can use 2001:DB8:: as a prefix for testing purposes.
SCOPEBOX FOR WINDOWS INSTALL
Whenever you add the DHCP server role to a Windows Server 2008 R2 machine, you automatically also install a DHCPv6 server. If you already have a DHCP server running on Windows Server 2008 R2, you can skip this step. Most tutorials on the web will tell you to disable stateless mode, but according to my tests this is unnecessary I will explain this in detail in my next post. This also applies for DHCPv6-related settings about the stateful and stateless mode. If you only want to play with DHCPv6, you don't need to configure any of the settings in the wizard. After you select the DHCP server role, a wizard will guide you through the installation process. To install a DHCP server on Windows Server 2008 R2, you have to add the DHCP server role in Server Manager by right-clicking the Roles node.
