BRIDGE(4)                 NetBSD Programmer's Manual                 BRIDGE(4)

NAME
     bridge - network bridge device

SYNOPSIS
     pseudo-device bridge

DESCRIPTION
     The bridge driver creates a logical link between two or more IEEE 802
     networks that use the same (or ``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.

     To use bridge, the administrator must first create the interface and con-
     figure the bridge parameters.  The bridge is created using the
     ifconfig(8) `create' subcommand.  The learning and forwarding behavior
     and other parameters of a bridge are configured by the brconfig(8) utili-
     ty.

     A bridge can be used to provide several services, such as a simple
     802.11-to-Ethernet bridge for wireless hosts, and traffic isolation.

     A bridge works like a hub, forwarding traffic from one interface to an-
     other.  Multicast and broadcast packets are always forwarded to all in-
     terfaces that are part of the bridge.  For unicast traffic, the bridge
     learns which MAC addresses are associated with which segments will for-
     ward the traffic selectively.

     The bridge driver implements the IEEE 802.1D Spanning Tree protocol
     (STP).  Spanning Tree is used to detect and remove loops in a network
     topology.

SEE ALSO
     brconfig(8)

HISTORY
     The bridge driver first appeared in NetBSD 1.6.

AUTHORS
     The bridge driver was originally written by Jason L. Wright
     <jason@thought.net> as part of an undergraduate independent study at the
     University of North Carolina at Greensboro.

     This version of the bridge driver has been heavily modified from the
     original version by
     Jason R. Thorpe <thorpej@wasabisystems.com>.

BUGS
     The bridge driver currently supports only Ethernet and Ethernet-like
     (e.g. 802.11) network devices.

     The bridge driver currently does not support snooping via bpf(4) or
     transparent filtering.

NetBSD 1.6                      August 17, 2001                              1

You can also request any man page by name and (optionally) by section:

Command: 
Section: 
Architecture: 
Collection: 
 

Use the DEFAULT collection to view manual pages for third-party software.


©1994 Man-cgi 1.15, Panagiotis Christias
©1996-2017 Modified for NetBSD by Kimmo Suominen