-At boot time each interface which has underlying hardware support
-makes itself known to the system during the autoconfiguration
-process. Once the interface has acquired its address it is
-expected to install a routing table entry so that messages may
-be routed through it. Most interfaces require some part of
-their address specified with an SIOCSIFADDR ioctl before they
-will allow traffic to flow through them. On interfaces where
-the network-link layer address mapping is static, only the
-network number is taken from the ioctl; the remainder is found
-in a hardware specific manner. On interfaces which provide
-dynamic network-link layer address mapping facilities (e.g.
-10Mb/s Ethernets), the entire address specified in the ioctl
-is used.
-.PP