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Embed code for: 24.5 IPv6 Address Assignment
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24.5 IPv6 Address Assignment
IPv6 Address Assignment Section 24: Introducing Basic IPv6 There are three methods for assigning IPv6 addresses: Manual: The entire IPv6 address can be manually configured, or the host identifier (the rightmost 64 bits) can be computed from the EUI64 of the interface. The EUI 64 format expands the 48bit MAC address of the device interface to 64 bits by inserting FFFE into the middle 16 bits, as shown in the figure. The EUI64 host ID format is commonly used for Cisco IP Phones, gateways, and routers. Stateless autoconfiguration: Stateless autoconfiguration uses neighbor discovery mechanisms to find routers and dynamically create IPv6 addresses. To use this method for an IPv6 node, it is important to connect the IPv6 node to a network that uses at least one IPv6 router. The router transmits router advertisements to the link. These announcements can allow the onlink connected IPv6 nodes to configure themselves with an IPv6 address and routing parameters, as specified in RFC 2462, without further human intervention. A node on the link can automatically configure its global IPv6 address by appending its interface identifier (64 bits) to the prefix (64 bits) that is included in the router advertisement messages. Stateless autoconfiguration enables “plug and play,” which connects devices to the network without any configuration and without any stateful servers (such as DHCP servers). It is an important feature for enabling the deployment of new devices on the Internet, such as cell phones, wireless devices, home appliances, and networks. Stateful autoconfiguration: Stateful autoconfiguration uses a DHCPv6 server to assign IPv6 addresses and additional parameters to hosts. Stateful autoconfiguration keeps a record of which addresses are assigned to which hosts, while the stateless method maintains no such records. An IPv6 address must be configured on an interface before the interface can forward IPv6 traffic. Configuring a global unicast IPv6 address on an interface automatically configures a linklocal address and activates IPv6 for that interface. Additionally, the configured interface automatically joins the following required multicast groups for that link: Solicitednode multicast group FF02:0:0:0:0:1:FF00::/104 (for each unicast and anycast address that is assigned to the interface) Allnodes linklocal multicast group FF02::1 Allrouters linklocal multicast group FF02::2 Up Next: Comparison of IPv4 and IPv6 Headers