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+.\"	$NetBSD: lo.4,v 1.10 2006/09/02 23:40:22 wiz Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)lo.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd September 3, 2006
+.Dt LO 4
+.Os
+.Sh NAME
+.Nm lo
+.Nd software loopback network interface
+.Sh SYNOPSIS
+.Cd "pseudo-device loop"
+.Sh DESCRIPTION
+The
+.Nm 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
+.Dv SIOCSIFADDR
+.Xr 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
+.Em never
+be configured first unless no hardware interfaces exist.
+.Pp
+The loopback interface
+.Nm lo0
+is created at boottime, it always exists and cannot be destroyed
+with
+.Xr ifconfig 8 .
+Additional loopback interfaces can be created by using the
+.Xr ifconfig 8
+.Cm create
+command.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It 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.
+.El
+.Sh SEE ALSO
+.Xr inet 4 ,
+.Xr intro 4 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+device appeared in
+.Bx 4.2 .
+.Sh BUGS
+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.