subnet6 2001:db8:0:910::/64 {
        range6 2001:db8:0:910::f00:0000 2001:db8:0:910::fff:0000;
        range6 2001:db8:0:910::/64 temporary;
        prefix6 2001:db8:ff00:: 2001:db8:ffff:: /64;
}