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wiz 2004-12-04 17:03:04 +00:00
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.\" $NetBSD: lo.4,v 1.8 2004/12/04 16:47:10 peter Exp $ .\" $NetBSD: lo.4,v 1.9 2004/12/04 17:03:04 wiz Exp $
.\" .\"
.\" Copyright (c) 1983, 1991, 1993 .\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved. .\" The Regents of the University of California. All rights reserved.
@ -29,7 +29,7 @@
.\" .\"
.\" @(#)lo.4 8.1 (Berkeley) 6/5/93 .\" @(#)lo.4 8.1 (Berkeley) 6/5/93
.\" .\"
.Dd June 5, 1993 .Dd December 4, 2004
.Dt LO 4 .Dt LO 4
.Os .Os
.Sh NAME .Sh NAME
@ -40,36 +40,35 @@
.Sh DESCRIPTION .Sh DESCRIPTION
The The
.Nm loop .Nm loop
interface is a software loopback mechanism which may be interface is a software loopback mechanism which may be used for
used for performance analysis, software testing, and/or local performance analysis, software testing, and/or local communication.
communication.
As with other network interfaces, the loopback interface must have As with other network interfaces, the loopback interface must have
network addresses assigned for each address family with which it is to be used. network addresses assigned for each address family with which it
These addresses is to be used.
may be set or changed with the These addresses may be set or changed with the
.Dv SIOCSIFADDR .Dv SIOCSIFADDR
.Xr ioctl 2 . .Xr ioctl 2 .
The loopback interface should be the last interface configured, The loopback interface should be the last interface configured, as
as protocols may use the order of configuration as an indication of priority. protocols may use the order of configuration as an indication of
priority.
The loopback should The loopback should
.Em never .Em never
be configured first unless no hardware be configured first unless no hardware interfaces exist.
interfaces exist.
.Pp .Pp
The loopback interface The loopback interface
.Nm lo0 .Nm lo0
is created at boottime, it always exists and cannot be destroyed with is created at boottime, it always exists and cannot be destroyed
with
.Xr ifconfig 8 . .Xr ifconfig 8 .
Additional loopback interfaces can be created by using the Additional loopback interfaces can be created by using the
.Xr ifconfig 8 .Xr ifconfig 8
.Sq create .Cm create
command. command.
.Sh DIAGNOSTICS .Sh DIAGNOSTICS
.Bl -diag .Bl -diag
.It lo%d: can't handle af%d . .It lo%d: can't handle af%d .
The interface was handed The interface was handed a message with addresses formatted in an
a message with addresses formatted in an unsuitable address unsuitable address family; the packet was dropped.
family; the packet was dropped.
.El .El
.Sh SEE ALSO .Sh SEE ALSO
.Xr inet 4 , .Xr inet 4 ,