2007-03-26 04:39:18 +00:00
|
|
|
.\" 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.
|
2014-03-14 03:07:51 +00:00
|
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
2007-03-26 04:39:18 +00:00
|
|
|
.\" 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" From: @(#)lo.4 8.1 (Berkeley) 6/5/93
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
|
|
|
|
.Dd March 25, 2007
|
|
|
|
|
.Dt EDSC 4
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm edsc
|
|
|
|
|
.Nd Ethernet discard network interface
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.Cd "device edsc"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.Nm
|
|
|
|
|
interface is a software discard mechanism which may be
|
|
|
|
|
used for performance analysis and software testing.
|
|
|
|
|
It imitates an Ethernet device, which
|
|
|
|
|
allows for its use in conjunction with such drivers as
|
|
|
|
|
.Xr if_bridge 4
|
|
|
|
|
and
|
|
|
|
|
.Xr vlan 4 .
|
|
|
|
|
.Pp
|
|
|
|
|
As with other network interfaces, an
|
|
|
|
|
.Nm
|
|
|
|
|
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
|
|
|
|
|
or
|
|
|
|
|
.Xr ifconfig 8
|
|
|
|
|
utility.
|
|
|
|
|
.Pp
|
|
|
|
|
Each
|
|
|
|
|
.Nm
|
|
|
|
|
interface is created at runtime using interface cloning.
|
|
|
|
|
This is most easily done with the
|
|
|
|
|
.Xr ifconfig 8
|
|
|
|
|
.Cm create
|
|
|
|
|
command or using the
|
|
|
|
|
.Va cloned_interfaces
|
|
|
|
|
variable in
|
|
|
|
|
.Xr rc.conf 5 .
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr ioctl 2 ,
|
|
|
|
|
.Xr arp 4 ,
|
|
|
|
|
.Xr if_bridge 4 ,
|
|
|
|
|
.Xr inet 4 ,
|
|
|
|
|
.Xr intro 4 ,
|
|
|
|
|
.Xr vlan 4 ,
|
|
|
|
|
.Xr rc.conf 5 ,
|
|
|
|
|
.Xr arp 8 ,
|
|
|
|
|
.Xr ifconfig 8
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
|
|
|
|
.Nm
|
|
|
|
|
device was derived from the
|
|
|
|
|
.Xr disc 4
|
|
|
|
|
device and first appeared in
|
2008-01-04 12:57:34 +00:00
|
|
|
.Fx 6.3 .
|
2007-03-26 04:39:18 +00:00
|
|
|
This manpage was adapted from
|
|
|
|
|
.Xr disc 4 .
|
|
|
|
|
.Sh CAVEATS
|
|
|
|
|
Since outgoing packets are just discarded by
|
|
|
|
|
.Nm ,
|
|
|
|
|
ARP requests stay unreplied.
|
|
|
|
|
Consequently, an IP packet cannot be sent via
|
|
|
|
|
.Nm
|
|
|
|
|
until a static
|
|
|
|
|
.Xr arp 4
|
|
|
|
|
entry is created for its next hop using
|
|
|
|
|
.Xr arp 8 .
|
|
|
|
|
.Pp
|
|
|
|
|
Initially an
|
|
|
|
|
.Nm
|
|
|
|
|
interface has a zero link level address.
|
|
|
|
|
It can be changed with
|
|
|
|
|
.Xr ifconfig 8
|
|
|
|
|
.Cm lladdr
|
|
|
|
|
if needed.
|
