Is there an renew after the lease-time or after the half of the lease-time in DHCPv6? Is there an address renew after the lease-time or after the half of the lease-time in DHCPv6 ? I´m not sure about, and I didn´t find that answer inside the RFC of DHCPv6.

DHCPv6 makes use of T1 and T2 timers. T1 timer is usually 50% of the preferred lifetime value. T2 is 80% of the preferred lifetime. When T1 timer expires, the DHCPv6 client sends a RENEW message. On receiving no response from the server, it waits until T2 expires and then sends a REBIND message.