If you want to have your DHCP-Server assigning unique local ipv6 addresses, but you don't have a IPv6 gateway or router jet, you will notice the following behavior:
The IPv6 adresses are assigned, but with a subnet mask of /128 and no communication is possible.
To circumvent this, you can make your DHCP-Server sending this information, that the router is supposed to send.
C:\ > netsh interface ipv6 set interface "Local Area Connection"
advertise=enabled
C:\ > netsh interface ipv6 set route fd00:17ef::/64 "Local Area Connection"
publish=yes
Now, when you're able to install a IPv6 gateway run this commands to disable the above behavior again:
C:\ > netsh interface ipv6 set interface "Local Area Connection"
advertise=disabled
C:\ > netsh interface ipv6 set route fd00:17ef::/64 "Local Area Connection"
publish=no
And don't forget to set your "Serveroption" 00023 to your DNS-Servers and 00024 to your domain name e.g. "contoso.com"