![]() ![]() A global routing prefix is comprised of at least 48 bits. Global routing prefix: is assigned by a service provider to an organization. These components are described as follows: IPv6 global unicast addresses support route prefix summarization, helping limit the numberįigure 11-2 shows a global unicast address consisting of a global routing prefix, subnet ID, and interface ID.įigure 11-2 Global unicast address format The loopback address cannot be used as the source or destination IP address of packets needing to be forwarded.Īn IPv6 global unicast address is an IPv6 address with a global unicast prefix, which is similar to an IPv4 public address. Is usually used as the IP address of a virtual interface, such as a loopback interface. ![]() Similar to the IPv4 loopback address 127.0.0.1, the IPv6 loopback address is used when a node needs to send IPv6 packets to itself. Devices do not forward packets with an unspecified address as the source IP address. (NS) messages, in duplicate address detection. ![]() It can be used as the source IP address of some packets, such as Neighbor Solicitation The IPv6 unspecified address is 0:0:0:0:0:0:0:0/128 or ::/128, indicating that an interface or a node does not have an IP address. IPv6 defines multiple types of unicast addresses, including the unspecified address, loopback address, global unicast address, link-local address, and unique local Packets sent toĪn IPv6 unicast address are delivered to the interface identified by that address. Since each interface belongs to a node, the IPv6 unicast address of any interface can identify the relevant node. IPv6 Unicast AddressĪn IPv6 unicast address identifies an interface. Instead, a multicast addressĬan be used as a broadcast address. Unlike IPv4, there is no broadcast IPv6 address. IPv6 addresses can be classified as unicast, multicast, or a new class called anycast.
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