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LO(4)		       FreeBSD Kernel Interfaces Manual			 LO(4)

NAME
     lo	-- software loopback network interface

SYNOPSIS
     device loop

DESCRIPTION
     The 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 SIOCSIFADDR	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 never be configured first unless no hardware interfaces
     exist.

DIAGNOSTICS
     lo%d: can't handle	af%d.  The interface was handed	a message with
     addresses formatted in an unsuitable address family; the packet was
     dropped.

SEE ALSO
     inet(4), intro(4)

HISTORY
     The lo device appeared in 4.2BSD.

BUGS
     Previous versions of the system enabled the loopback interface automati-
     cally, 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.

FreeBSD	6.0			 June 5, 1993			   FreeBSD 6.0

NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS | SEE ALSO | HISTORY | BUGS

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