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.\" $OpenBSD: brconfig.8,v 1.2 1999/02/26 19:17:41 jason Exp $
.\"
.\" Copyright (c) 1999 Jason L. Wright (jason@thought.net)
.\" 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by Jason L. Wright
.\" 4. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
.\"
.Dd Feb 26, 1999
.Dt BRCONFIG 8
.Os
.Sh NAME
.Nm brconfig
.Nd manipulate Ethernet bridges
.Sh SYNOPSIS
.Nm brconfig
.Ar bridge-name
.Op Ar up
.Op Ar down
.Op Ar list
.Op Ar routes
.Op Ar status
.Op Ar add interface-name
.Op Ar delete interface-name
.Op Ar link0
.Op Ar link1
.Op Ar -link0
.Op Ar -link1
.Op Ar ...
.Sh DESCRIPTION
The
.Nm brconfig
utility retrieves kernel state of Ethernet bridges and allows
user control of these bridges. Its command line consists
of the name of a bridge and a set of operations to be
performed on that bridge. The commands are executed in
the order they were specified.
.Pp
The available commands are:
.Bl -tag -width Ds
.It Ar up
Start the bridge forwarding packets.
.It Ar down
Stop the bridge from forwarding packets.
.It Ar list
Retrieve a list of interface members of the bridge.
.It Ar routes
Display the routes that have been learned by the bridge.
.It Ar status
Print the status of the bridge, including member interfaces and
routes learned by the bridge.
.It Ar add interface-name
Add the interface named by
.Ar interface-name
as a member of the bridge.
The interface must already be ready for packet
reception, (ie. it must be in the
.Cm up
state, see
.Xr ifconfig 8 )
The interface is put into promiscuous mode so
that it can receive every packet sent on the
network.
.It Ar delete interface-name
Remove the interface named by
.Ar interface-name
from the bridge.
Promiscuous mode is turned off for the interface when it is
removed from the bridge.
.It Ar link0
Setting this flag stops all non-IP multicast packets from
being forwarded by the bridge.
.It Ar -link0
Clear the
.Ar link0
flag on the bridge interface.
.It Ar link1
Setting this flags stops all IP multicast packets from
being forwarded by the bridge.
.It Ar -link0
Clear the
.Ar link1
flag on the bridge interface.
.El
.Sh EXAMPLES
.Bl -tag -width brconfig
.It Cm brconfig bridge0 add pn0 add mx0 up
Add the Ethernet interfaces pn0 and mx0 to the bridge bridge0, and
start the bridge forwarding packets.
.It Cm brconfig bridge0 list
Retrieve a list of interfaces that are members of bridge0.
.It Cm brconfig bridge0 down
Stop bridge0 from forwarding packets.
.It Cm brconfig bridge0 delete pn0
Remove the interface pn0 from the bridge bridge0.
.El
.Sh SEE ALSO
.Xr ifconfig 8 ,
.Xr bridge 4
.Sh HISTORY
.Nm brconfig
first appeared in
.Ox 2.5 .
.Sh AUTHOR
The
.Xr brconfig 8
command and the
.Xr bridge 4
kernel interface were written by Jason L. Wright <jason@thought.net> as
part of an undergraduate indenpendent study
at the University of North Carolina at Greensboro.
.Sh BUGS
There are some Ethernet chipsets which will not work in a bridge
configuration. Some, like the Lite-On PNIC, have serious flaws when
running in promiscuous mode, and others, like the TI ThunderLAN, receive
their own transmissions, which makes the route learning code ineffective.
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