270 lines
8.0 KiB
Groff
270 lines
8.0 KiB
Groff
.\" $NetBSD: brconfig.8,v 1.13 2006/01/12 21:49:11 wiz Exp $
|
|
.\"
|
|
.\" Copyright 2001 Wasabi Systems, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Written by Jason R. Thorpe for Wasabi Systems, Inc.
|
|
.\"
|
|
.\" 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 for the NetBSD Project by
|
|
.\" Wasabi Systems, Inc.
|
|
.\" 4. The name of Wasabi Systems, Inc. may not be used to endorse
|
|
.\" or promote products derived from this software without specific prior
|
|
.\" written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
|
|
.\" 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 March 19, 2003
|
|
.Dt BRCONFIG 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm brconfig
|
|
.Nd configure network bridge parameters
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Fl a
|
|
.Nm
|
|
.Ar bridge
|
|
.Nm
|
|
.Ar bridge
|
|
.Ar command
|
|
.Op Ar args ...
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility is used to configure network bridge parameters and retrieve
|
|
network bridge parameters and status from the kernel.
|
|
The bridging function is implemented by the
|
|
.Xr bridge 4
|
|
driver.
|
|
.Pp
|
|
A network bridge creates a logical link between two or more
|
|
IEEE 802 networks that use the same (or
|
|
.Dq similar enough )
|
|
framing format.
|
|
For example, it is possible to bridge Ethernet
|
|
and 802.11 networks together, but it is not possible to bridge
|
|
Ethernet and Token Ring together.
|
|
.Pp
|
|
Bridge interfaces are created using the
|
|
.Xr ifconfig 8
|
|
command's
|
|
.Dq create
|
|
sub-command.
|
|
All other bridge configuration is performed using
|
|
.Nm .
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width indent
|
|
.It Fl a
|
|
Display the status of all bridge devices present on the system.
|
|
This flag is mutually exclusive with all other sub-commands.
|
|
.El
|
|
.Pp
|
|
All other operations require that a bridge be specified.
|
|
If a bridge is specified with no sub-commands,
|
|
the status of that bridge is displayed.
|
|
The following sub-commands are available:
|
|
.Pp
|
|
.Bl -tag -width indent
|
|
.It Cm up
|
|
Start forwarding packets on the bridge.
|
|
.It Cm down
|
|
Stop forwarding packets on the bridge.
|
|
.It Cm add Ar interface
|
|
Add the interface named by
|
|
.Ar interface
|
|
as a member of the bridge.
|
|
The interface is put into promiscuous mode
|
|
so that it can receive every packet sent on the network.
|
|
.It Cm delete Ar interface
|
|
Remove the interface named by
|
|
.Ar interface
|
|
from the bridge.
|
|
Promiscuous mode is disabled on the interface when
|
|
it is removed from the bridge.
|
|
.It Cm maxaddr Ar size
|
|
Set the size of the bridge address cache to
|
|
.Ar size .
|
|
The default is 100 entries.
|
|
.It Cm timeout Ar seconds
|
|
Set the timeout of address cache entries to
|
|
.Ar seconds
|
|
seconds.
|
|
If
|
|
.Ar seconds
|
|
is zero, then address cache entries will not be expired.
|
|
The default is 240 seconds.
|
|
.It Cm deladdr Ar address
|
|
Delete
|
|
.Ar address
|
|
from the address cache.
|
|
.It Cm flush
|
|
Delete all dynamically-learned addresses from the address cache.
|
|
.It Cm flushall
|
|
Delete all addresses, including static addresses, from the address cache.
|
|
.It Cm discover Ar interface
|
|
Mark an interface as a
|
|
.Dq discovering
|
|
interface.
|
|
When the bridge has no address cache entry
|
|
(either dynamic or static)
|
|
for the destination address of a packet,
|
|
the bridge will forward the packet to all
|
|
member interfaces marked as
|
|
.Dq discovering .
|
|
This is the default for all interfaces added to a bridge.
|
|
.It Cm -discover Ar interface
|
|
Clear the
|
|
.Dq discovering
|
|
attribute on a member interface.
|
|
For packets without the
|
|
.Dq discovering
|
|
attribute, the only packets forwarded on the interface are broadcast
|
|
or multicast packets and packets for which the destination address
|
|
is known to be on the interface's segment.
|
|
.It Cm ipf
|
|
Enable IPF packet filtering on the bridge.
|
|
The current implementation passes
|
|
all ARP and RARP packets through the bridge while filtering IP and ICMP
|
|
packets through IPF.
|
|
.It Cm -ipf
|
|
Disable IPF packet filtering on the bridge (the default).
|
|
.It Cm learn Ar interface
|
|
Mark an interface as a
|
|
.Dq learning
|
|
interface.
|
|
When a packet arrives on such an interface, the source
|
|
address of the packet is entered into the address cache as being a
|
|
destination address on the interface's segment.
|
|
This is the default for all interfaces added to a bridge.
|
|
.It Cm -learn Ar interface
|
|
Clear the
|
|
.Dq learning
|
|
attribute on a member interface.
|
|
.It Cm stp Ar interface
|
|
Enable Spanning Tree protocol on
|
|
.Ar interface .
|
|
The
|
|
.Xr bridge 4
|
|
driver has support for the IEEE 802.1D Spanning Tree protocol (STP).
|
|
Spanning Tree is used to detect and remove loops in a network topology.
|
|
.It Cm -stp Ar interface
|
|
Disable Spanning Tree protocol on
|
|
.Ar interface .
|
|
This is the default for all interfaces added to a bridge.
|
|
.It Cm maxage Ar seconds
|
|
Set the time that a Spanning Tree protocol configuration is valid.
|
|
The default is 20 seconds.
|
|
The minimum is 1 second and the maximum is 255 seconds.
|
|
.It Cm fwddelay Ar seconds
|
|
Set the time that must pass before an interface begins forwarding
|
|
packets when Spanning Tree is enabled.
|
|
The default is 15 seconds.
|
|
The minimum is 1 second and the maximum is 255 seconds.
|
|
.It Cm hellotime Ar seconds
|
|
Set the time between broadcasting of Spanning Tree protocol
|
|
configuration messages.
|
|
The default is 2 seconds.
|
|
The minimum is 1 second and the maximum is 255 seconds.
|
|
.It Cm priority Ar value
|
|
Set the bridge priority for Spanning Tree.
|
|
The default is 32768.
|
|
The minimum is 0 and the maximum is 65536.
|
|
.It Cm ifpriority Ar interface Ar value
|
|
Set the Spanning Tree priority of
|
|
.Ar interface
|
|
to
|
|
.Ar value .
|
|
The default is 128.
|
|
The minimum is 0 and the maximum is 255.
|
|
.It Cm ifpathcost Ar interface Ar value
|
|
Set the Spanning Tree path cost of
|
|
.Ar interface
|
|
to
|
|
.Ar value .
|
|
The default is 55.
|
|
The minimum is 0 and the maximum is 65535.
|
|
.El
|
|
.Sh EXAMPLES
|
|
The following, when placed in the file
|
|
.Pa /etc/ifconfig.bridge0 ,
|
|
will cause a bridge called
|
|
.Sq bridge0
|
|
to be created, add the interfaces
|
|
.Sq ray0
|
|
and
|
|
.Sq fxp0
|
|
to the bridge, and then enable packet forwarding.
|
|
Such a configuration could be used to implement a simple
|
|
802.11-to-Ethernet bridge (assuming the 802.11 interface is
|
|
in ad-hoc mode).
|
|
.Bd -literal -offset indent
|
|
create
|
|
!brconfig $int add ray0 add fxp0 up
|
|
.Ed
|
|
.Pp
|
|
Consider a system with two 4-port Ethernet boards.
|
|
The following placed in the file
|
|
.Pa /etc/ifconfig.bridge0
|
|
will cause a bridge consisting of all 8 ports with Spanning Tree
|
|
enabled to be created:
|
|
.Bd -literal -offset indent
|
|
create
|
|
!brconfig $int \e
|
|
add tlp0 stp tlp0 \e
|
|
add tlp1 stp tlp1 \e
|
|
add tlp2 stp tlp2 \e
|
|
add tlp3 stp tlp3 \e
|
|
add tlp4 stp tlp4 \e
|
|
add tlp5 stp tlp5 \e
|
|
add tlp6 stp tlp6 \e
|
|
add tlp7 stp tlp7 \e
|
|
up
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr bridge 4 ,
|
|
.Xr ifconfig.if 5 ,
|
|
.Xr ifconfig 8 ,
|
|
.Xr ipf 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility first appeared in
|
|
.Nx 1.6 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Xr bridge 4
|
|
driver and
|
|
.Nm
|
|
utility were originally written by
|
|
.An Jason L. Wright
|
|
.Aq jason@thought.net
|
|
as part of an undergraduate independent study at the
|
|
University of North Carolina at Greensboro.
|
|
.Pp
|
|
This version of the
|
|
.Nm
|
|
utility was written from scratch by
|
|
.An Jason R. Thorpe
|
|
.Aq thorpej@wasabisystems.com .
|