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	Transparent bridge - Wikipedia, the free encyclopedia
		A transparent bridge is a particular case of Network bridge, i.e.
		While a Network bridge simply enables local netwowrks (or segments) to communicate with each other, but forwards the traffic to all ports, a transparent bridge is capable of redirecting the packets to the proper port, hence it can isolate the networks from broadcast traffic.
		A transparent bridge directs the outgoing data traffic using a forwarding table that assocites addresses to ports.
	en.wikipedia.org /wiki/Transparent_bridge (367 words)

	Transparent Bridging
		Transparent bridges are so named because their presence and operation are transparent to network hosts.
		Finally, each bridge port is associated with a path cost, which represents the cost of transmitting a frame onto a LAN through that port.
		A bridge's root port is the port through which the root bridge can be reached with the least aggregate path cost, a value that is called the root path cost.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/transbdg.htm (1887 words)

	Transparent Bridging
		Transparent bridges perform no protocol translation (such as from Ethernet to FDDI, or to Token Ring), and they do not calculate paths through the network to any end node.
		A transparent bridge is listening to see where each MAC has been connected to the network.
		When a transparent bridge encounters a frame that is to be forwarded to a destination MAC it forwards it out a specific port that it has associated with that MAC address.
	www.inetdaemon.com /tutorials/lan/bridging/transparent.shtml (456 words)

	[No title]
		Source route transparent bridging is used in topologies in which transparent end systems and source route-only end systems coexist on the same network; source route transparent bridging allows the transparent end systems to communicate with transparent end systems and source route-only end systems to communicate with source route-only end systems.
		When bridging a packet from a source route domain to a transparent bridge domain using SRTG, the source route field of the frame is removed as shown in Figure 6-11.
		Whenever bridging packets from the transparent bridge to source route domain, SRTG adds the virtual ring number and its own bridge number to the source route information of the destination station retrieved from the source route table.
	support.3com.com /infodeli/tools/bridrout/u_guides/html/nb91/operation/srbridging.op4.html (3652 words)

	Configuring Transparent Bridging
		Bridge groups cannot be used outside the router on which it is defined to identify traffic switched within the bridge group.
		Bridge groups within the same router function as distinct bridges; that is, bridged traffic and bridge protocol data units (BPDUs cannot be exchanged between different bridge groups on a router.
		While bridge groups remain internal organizations of network interfaces functioning as distinct bridges within a router, transparent bridging on subinterfaces permits bridge groups to be used to multiplex different streams of bridged traffic on a LAN or HDLC serial interface.
	www.cisco.com /univercd/cc/td/doc/product/software/ios122/122cgcr/fibm_c/bcfpart1/bcftb.htm (8688 words)

	[No title]
		A Transparent Bridge maintains a Forwarding Database consisting of {address, interface} records, by saving the Source Address of each LAN transmission that it receives, along with the interface identifier for the interface it was received on.
		In its search, the bridge looks for the segment-and-bridge identifier of the interface the packet was received on, and forwards the packet toward the segment identified in the segment-and-bridge identifier that follows it.
		Since these remote bridges are modeled as a single bridge with a strange internal interface, each remote bridge needs to know the LAN segment and bridge numbers of the adjacent remote bridge.
	www.ietf.org /rfc/rfc1638.txt (6325 words)

	CommsDesign - Bridging the PCI-X Gap in Multi-Processor Comm Architectures
		Previous generations of PCI bridges have features known as private device and private memory (also known as opaque memory) to prevent the host on the primary side of the bridge from accessing resources on the secondary side of the bridge.
		Bridge masquerade, also known as alternative ID or EEPROM load, is a feature that has emerged in some of the newer bridges, and is sometimes mistaken for a form of non-transparency.
		Setting the device to the non-transparent mode allows the bridge to appear as a memory-mapped endpoint with a type-0 header, instead of being identified as a PCI bridge, as it would if the bridge were set to transparent mode, which would be identified with a type-1 header.
	www.commsdesign.com /showArticle.jhtml?articleID=52601399 (2196 words)

	Internetworking Technology Overview (Site not responding. Last check: 2007-10-11)
		Transparent bridges were first developed at Digital Equipment Corporation (Digital) in the early 1980s.
		When transparent bridges are powered on, they learn the network's topology by analyzing the source address of incoming frames from all attached networks.
		In some cases, the bridges will then change their internal tables to indicate that Host A is on network 1.
	www.delmar.edu /Courses/ITNW1392/internetworking/55032.htm (1561 words)

	[No title] (Site not responding. Last check: 2007-10-11)
		If the bridge has detected a port that is malfunctioning it will place that port into the broken(6) state.
		Thus, each port of the bridge is represented by a single bit within the value of this object.
		Auto translation means a bridge learns, from the CSMA/CD ports, which frame format (ie Ethernet or IEEE 802.3 w/snap) a source address is using.
	www.enterasys.com /pub/snmp/mibs/cabletron/ctron-bridge-mib.txt (2686 words)

	RFC 1493 (rfc1493) - Definitions of Managed Objects for Bridges (Site not responding. Last check: 2007-10-11)
		Implicit in this Bridge MIB is the notion of ports on a bridge.
		For example, in an entity which exclusively performed bridging, all protocols would be considered as being bridged, whereas in an entity which performed IP routing on IP datagrams and only bridged other protocols, only the non-IP data would be considered as being bridged.
		Thus, this Bridge MIB (and in particular, its counters) are applicable only to that subset of the data on an entity's interfaces which is sent/received for a protocol being bridged.
	www.faqs.org /rfcs/rfc1493.html (3232 words)

	TechOnLine - Multiprocessing on PCI and CompactPCI (Site not responding. Last check: 2007-10-11)
		From the multiprocessing point of view, this transparent bridge behaves in exactly the same way as the direct connection of two PCI buses (review Direct Connection of Two PCI Buses Without a Bridge).
		The first problem is that transparent PPBs can only be configured from the primary (local) PCI side via a special configuration cycle coming from their local processor.
		PCI to PCI bridges cannot be selected by configuration cycles coming from their secondary or backplane interface, making it impossible for the host board to identify the intelligent I/O board and vice versa.
	www.techonline.com /community/ed_resource/feature_article/3963 (1629 words)

	CommsDesign - Non-Transparent Bridging Makes PCI-Express HA Friendly
		The PCI specification defines standard PCI-to-PCI bridge configurations (transparent bridging), which allows the host to pass through the bridges to discover all the end-points in its address domain.
		A non-transparent bridge is functionally similar to a transparent bridge, with the exception that there is an intelligent device or processor on both sides of the bridge, each with its own independent address domain.
		Each control module is connected into one switch fabric module via a transparent port for its primary path, and to the other switch fabric module via a non-transparent port for a backup connection.
	www.commsdesign.com /design_corner/OEG20030814S0015 (2014 words)

	LWN: Patch: PCI-PCI transparent bridge handling improvements (pci core)
		"Transparent" PCI-PCI bridges are currently "ignored" by the resource management code in the PCI core.
		This means devices behind the bridge are handled as if there was no bridge.
		There are two types of functions calling it: some functions already know the exact resource for which they want to find the parent in order to properly insert it into the resource database.
	lwn.net /Articles/128226 (364 words)

	6 - Networking
		Unlike a router, packets transfer through the bridge "invisibly" -- logically, the two network segments appear to be one segment to nodes on either side of the bridge.
		The bridge will only forward packets that have to pass from one segment to the other, so among other things, they provide an easy way to reduce traffic in a complex network and yet allow any node to access any other node when needed.
		To monitor and control the bridge you have created, use the brconfig(8) command, which can also be used to create a bridge after boot.
	www.openbsd.org /faq/faq6.html#DHCP (7738 words)

	What would be a non-transparent bridge? - Ethernet
		I wonder what would be a non-transparent bridge.
		Trivia: A "transparent" object is one which is physically present, but
		can be treated as if it was not (e.g., a transparent bridge).
	www.dcomtalk.com /ptopic55.html (1046 words)

	freshmeat.net: Tutorials - Configuring a Transparent Proxy/Webcache in a Bridge using Squid and ebtables
		Furthermore, if a bridge is used, you do not have to change anything in your network, just plug in the bridge and start working.
		Remember to document where in your network the bridge is. Bridges do not appear in traceroutes, and that may be a bit confusing and hard to locate in a big network.
		We have a two-NIC machine acting a as bridge, everything it receives on one nic is "blindly" passed to the other, only web traffic is redirected to squid, and incoming traffic to port 81 will be served by apache.
	freshmeat.net /articles/view/1433 (3001 words)

	[Bridge] Bridge / Transparent Proxy (Site not responding. Last check: 2007-10-11)
		Hi, I am using my machine as a Bridge and running transparent proxy on it.
		If yes then what is the solution - as I want to use my machine as Transparent proxy and I have setup iptables rules on it.
		So it seems my transparent porxy is not coming in between and bridge is directly forwarding packet.
	lists.osdl.org /pipermail/bridge/2004-October/000672.html (269 words)

	Asymmetrically routing through transparent fw (bridge) - Linux Networking
		Bridge "devices" are virtual and you add interfaces (nics) to a single
		bridge device to participate in the bridged net segment.
		bridging and which are routing and which one(s) you would like to
	www.linuxaa.com /post-39294.html (2260 words)

	Transparent Bridge - Compare Prices, Reviews and Buy at NexTag - Price - Review
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	www.nextag.com /transparent-bridge/search-html (368 words)

	Daemon News '200207' : '"HOWTO: Transparent Packet Filtering with OpenBSD "' (Site not responding. Last check: 2007-10-11)
		OpenBSD's bridging support is highly evolved: while the bridge operates solely at Layer 2, Layers 3 and 4 can still be filtered and manipulated while in transit through the bridge interfaces by pf.
		Assuming the 2 bridge interfaces are fxp0 and fxp1 (if your interface names are different, change the interface names accordingly), create the following files with these parameters:
		Your bridge is now up and running and we can begin to configure the ruleset for
	ezine.daemonnews.org /200207/transpfobsd.html (957 words)

	[No title]
		For human convenience, we often use a textual string, termed the descriptor, to also refer to the object type.
		Decker, Langille, Rijsinghani & McCloghrie [Page 9] RFC 1493 Bridge MIB July 1993 -- Several objects in this MIB module represent values of -- timers used by the Spanning Tree Protocol.
		Decker, Langille, Rijsinghani & McCloghrie [Page 31] RFC 1493 Bridge MIB July 1993 The authors wish to thank the members of the Bridge Working Group for their many comments and suggestions which improved this effort.
	www.ietf.org /rfc/rfc1493.txt (3226 words)

	Intel® PCI Bridges
		Intel PCI Bridges let designers add more PCI devices, or more PCI option card slots, than a single PCI bus can support.
		Intel offers both transparent and non-transparent PCI bridges, as well as a PCI-X transparent bridge with opaque memory mode for semi-transparent operation.
		However, non-transparent bridges differ from standard, transparent PCI-to-PCI bridges by allowing independent mapping of primary and secondary bus address spaces, a key benefit when local devices require private memory maps.
	developer.intel.com /design/bridge (184 words)

	Symantec slows spam at the edge
		If you were going to send that much mail through this product, you'd want a high-availability solution, and the Mail Security 8160 is designed to operate as an active/passive two-node cluster with automatic failover and database synchronization.
		Although the Mail Security 8160 can operate as either a routing or bridging device, we installed it as a transparent bridge directly in front of our test mail server.
		We recommend that configuration because you don't want to send anything but e-mail through this device because it has virtually no management, control or monitoring capabilities.
	www.networkworld.com /reviews/2005/041105symantectest.html (984 words)

	Ausweb97 The Professional Doctorate on WebCD
		All such audiovisual components are located on the DBA CD.
		Traditional in-text activities, also encapsulated within the CD based study guide, form the basis for student interaction as well as forming a transparent bridge between CD and Web.
		The WWW site developed for the DBA features a public access homepage offering course information, news and open discussion.
	www.ausweb.scu.edu.au /proceedings/meg (2173 words)

	FORTH - ICS:
		Fast and transparent recovery for continuous availability of cluster-based servers.
		Clotho: Transparent data versioning at the block i/o level.
		In 12th NASA Goddard and 21st IEEE Conference on Mass Storage Systems and Technologies (MSST2004), April 2004.
	www.ics.forth.gr /carv/publications.html (5077 words)

	Computer Architecture and VLSI systems Group Publications
		Zitterbart, A. Tantawy, D. Serpanos: Architecture of the High Perfomance Transparent Bridge, IEEE/ACM Transactions on Networking, Vol.2, No. 4, pages 352-362, Aug 1994.
		Serpanos, A. Tantawy, M. Zitterbart: Transparent Bridging Support in High Speed Interworking Units, Proceedings, IEEE Int Conference on Communications (ICC'93), Geneva, Switzerland, May 1993.
		E.P. Markatos: How Architecture Evolution influences the Scheduling Discipline in Shared-Memory Multiprocessors.
	archvlsi.ics.forth.gr /publications.html (3870 words)

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