http://files.zeroconf.org/draft-ietf-zeroconf-ipv4-linklocal.txt To participate in wide-area IP networking, a host needs to be
configured with IP addresses for its interfaces, either manually by
the user or automatically from a source on the network such as a DHCP
server. Unfortunately, such address configuration information may not
always be available. It is therefore beneficial for a host to be able
to depend on a useful subset of IP networking functions even when no
address configuration is available. This document describes how a
host may automatically configure an interface with an IPv4 address
within the 169.254/16 prefix that is valid for communication with
other devices connected to the same physical (or logical) link.
