|LO(4)||Device Drivers Manual||LO(4)|
lo — software
loopback network interface
loop interface is a software loopback
mechanism which may be used for performance analysis, software testing,
and/or local communication. As with other network interfaces, the loopback
interface must have network addresses assigned for each address family with
which it is to be used. These addresses may be set or changed with the
ioctl(2). The loopback interface should
be the last interface configured, as protocols may use the order of
configuration as an indication of priority. The loopback should
configured first unless no hardware interfaces exist.
lo device appeared in
Previous versions of the system enabled the loopback interface automatically, using a nonstandard Internet address (127.1). Use of that address is now discouraged; a reserved host address for the local network should be used instead.
|June 5, 1993||BSD 4.2|