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Link-local addresses may be assigned manually by an administrator or by automatic operating system procedures. 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.
The Ad Hoc Configuration Protocol (AHCP) is an autoconfiguration protocol for IPv6 and dual-stack IPv6/IPv4 networks designed to be used in place of router discovery and DHCP on networks where it is difficult or impossible to configure a server within every link-layer broadcast domain, for example mobile ad hoc networks.
"Using the Client Autoconfiguration File". Netscape Proxy Server Administrator's Guide: Chapter 11. 1998-02-25. Archived from the original on 2004-08-10. "Chapter 26 - Using Automatic Configuration, Automatic Proxy, and Automatic Detection". Microsoft TechNet "Proxy Auto Config for Firefox (PAC).
Mechanisms were introduced to handle this task automatically, and both IPv4 and IPv6 now include systems for address autoconfiguration, which allows a device to determine a safe address to use through simple mechanisms. For link-local addressing, IPv4 uses the special block 169.254.0.0 / 16, [1] while IPv6 hosts use the prefix fe80:: / 10.
Auto-configuration is the automatic configuration of devices without manual intervention, without any need for software configuration programs or jumpers.Ideally, auto-configuring devices should just "plug and play".
DHCP services are used for Internet Protocol version 4 (IPv4) and IPv6. The details of the protocol for IPv4 and IPv6 differ sufficiently that they may be considered separate protocols. [12] For the IPv6 operation, devices may alternatively use stateless address autoconfiguration.
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The article incorrectly stated that use of the address must be discontinued once a globally routable address is available. This is incorrect per the RFC, which says the address SHOULD not be used if a better one is available, but may, as long as the application understands the implications, and gives a specific example of a host that is simultaneously on both the link-local network and a ...