Address/prefix lease renewal

An IPv6 address/prefix assigned by a DHCPv6 server has a valid lifetime. After the valid lifetime expires, the DHCPv6 client cannot use the IPv6 address/prefix. To use the IPv6 address/prefix, the DHCPv6 client must renew the lease time.

Figure 66: Using the Renew message for address/prefix lease renewal

As shown in Figure 66, at T1, the DHCPv6 client sends a Renew message to the DHCPv6 server. The recommended value of T1 is half the preferred lifetime. The DHCPv6 server responds with a Reply message, informing the client whether the lease is renewed.

Figure 67: Using the Rebind message for address/prefix lease renewal

As shown in Figure 67:

For more information about the valid lifetime and the preferred lifetime, see "Configuring basic IPv6 settings."