In the Internet Protocol Version 6 (IPv6), the address block fe80:: / 10 has been reserved for link-local unicast addressing. IPv6 link-local unicast address structure Microsoft refers to this address autoconfiguration method as Automatic Private IP Addressing ( APIPA). When a globally routable or a private address becomes available after a link-local address has been assigned, the use of the new address should generally be preferred to the link-local address for new connections but communication via the link-local address is still possible. The process ends when there is no reply to the ARP, indicating the candidate IP address is available. If a reply is received to the ARP probe, it indicates the candidate IP address is already in use a new random candidate IP address is then created and the process repeated. In the automatic address configuration process, network hosts select a random candidate address within the reserved range and use Address Resolution Protocol (ARP) probes to ascertain that the address is not in use on the network. : 1.9 Therefore, hosts search for a DHCP server on the network before assigning link-local addresses. The simultaneous use of IPv4 addresses of different scope on the same interface, such as configuring link-local addresses as well as globally routable addresses, may lead to confusion and increased complexity. stateless, address autoconfiguration when other means of address assignment are not available. : 2.1 Link-local addresses are assigned to interfaces by host-internal, i.e. The entire range may be used for this purpose, except for the first 256 and last 256 addresses ( 169.254.0.0 / 24 and 169.254.255.0 / 24), which are reserved for future use and must not be selected by a host using this dynamic configuration mechanism. In IPv6, link-local addresses are always assigned, along with addresses of other scopes, and are required for the internal functioning of various protocol components. In IPv4, link-local addresses are normally only used when no external, stateful mechanism of address configuration exists, such as the Dynamic Host Configuration Protocol (DHCP), or when another primary configuration method has failed. However, in IPv6 the link-local address may be derived from the interface media access control (MAC) address in a rule-based method. In Internet Protocol (IP) networks, they are assigned most often using stateless address autoconfiguration, a process that often uses a stochastic process to select the value of link-local addresses, assigning a pseudo-random address that is different for each session. Link-local addresses may be assigned manually by an administrator or by automatic operating system procedures. In IPv6, they are assigned from the block fe80:: / 10. Therefore, routers do not forward packets with link-local source or destination addresses. Link-local addresses are not guaranteed to be unique beyond their network segment. Link-local addresses are most often assigned automatically with a process known as stateless address autoconfiguration or link-local address autoconfiguration, also known as automatic private IP addressing ( APIPA) or auto-IP. In computer networking, a link-local address is a unicast network address that is valid only for communications within the subnetwork that the host is connected to. Network address usable for communication within a subnet
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