To have your DNS/DHCP Server ready for DHCPv6 deployment, you need to configure DNS/DHCP Server with an IPv6 address with which clients can communicate.
IPv6 addresses should be configured on Service interface (eth0) through the DNS/DHCP Server Administration Console. DHCPv6 Deployment Roles can only be associated with DNS/DHCP Servers that have IPv6 addresses assigned to the services interface. For more information of configuration of IPv6 interfaces, refer to Interface settings.