How to configure wds bridging on tp

Everything You Need To Know About Wireless Bridging & Repeating - Part 1: WDS DetailsTlặng Higgins28 June 2010
Introduction, WDS Explained, Interoperability Tips for WDS Success, Get MAC AddressEx. 1: Bridge w/WDS enabled routerTroubleshooting, Ex. 2: WDS bridge pairPerformance, Closing Thoughts

Many Wi-Fi routers come equipped with wireless repeating capabilities. But properly configuring them often isn"t easy. This article will nhận xét the basics of WDS-based wireless repeating và I"ll then walk through setting up a few examples.

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Please read references khổng lồ access points (AP) as applying lớn either access points or wireless routers unless otherwise noted.

WDS Explained

WDS, which stands for Wireless Distribution System, is a feature that enables single-radio APs to be wirelessly inconnected instead of using a wired Ethernet connection.

WDS connections are MAC address-based and employ a special data frame type that uses all four of the (MAC) address fields allowed in the 802.11 standard, instead of the three addresses used in normal AP STA (client) traffic. (In the 802.11 frame header, address 1 is the destination address, address 2 is the source address, address 3 is the BSSID of the network và address 4 is used for WDS, to lớn indicate the transmitter address.)

The provision for four MAC addresses in a frame is about the only thing covered by the 802.11 standards. But it was enough to allow bridging features to first be added lớn enterprise-grade, i.e. expensive sầu, 802.11b products in the late 1990"s. Many of these implementations were based around a medium access control (MAC) layer kiến thiết originated by a long-defunct company called Choice Microsystems.

APs with wireless bridging features remained as high-priced items until fall 2002 when wireless bridging moved inkhổng lồ consumer priced wireless products. D-Link first broke the artificially high wireless bridging price barrier by releasing a miễn phí nâng cấp to lớn its DWL-900AP+ Access Point . This nâng cấp created the first consumer-priced WLAN sản phẩm to lớn tư vấn bridging and repeating. Other companies soon followed with similar upgrades, and also introduced dedicated Wireless Bridges, such as Linksys" WET11 <reviewed here>.

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Though these products were actually making use of the WDS feature, they didn"t refer to it as such. It wasn"t until products based on Broadcom"s 802.11g chipphối started to lớn hit the market at the beginning of 2003 that the WDS term started to lớn be commonly used. (Broadcom apparently included WDS support in its APhường reference thiết kế code.)

WDS can be used to provide two modes of wireless AP-to-AP connectivity:

Two disadvantages lớn using WDS are:

It"s more difficult to phối up than non-WDS. Dynamically assigned & rotated encryption keys are not generally supported in a WDS connection. This means that Wi-Fi Protected Access (WPA / WPA2) và other dynamic key assignment technology might not be available. Static WEP keys are more commonly supported in WDS connections. Whatever encryption is supported in the WDS links is what the repeater"s clients must use.

chú ý that wireless throughput is cut approximately in half for each repeating "hop", i.e. an APhường that data flows through before hitting the wired network. This is because all transmissions use the same channel and radio and must be retransmitted lớn reach the wired LAN. The repeating throughput reduction applies both khổng lồ WDS & non-WDS repeating.

WDS isn"t the only way lớn bridge & repeat, however. Some products don"t use WDS at all và instead act like wireless client adapters. But instead of connecting via USB, Cardbus or other computery interfaces, they connect via Ethernet. So they can be used khổng lồ wirelessly connect devices lượt thích media players, game systems or any other networkable device that has an Ethernet connector. I"ll cover these devices in another part of this series.

WDS Interoperability

As noted earlier, detailed specifications for WDS don"t exist. Instead, the wireless networking industry has been pursuing mesh wireless, which is self-configuring & self-healing. There is no mesh wireless standard yet—the IEEE Mesh Networking Task Group (TGs) has been grinding away since 2004 & isn"t scheduled khổng lồ be done until mid 2011.

In the meantime, companies like Meraki, Proxim, Cisco and others have developed và sold wireless mesh systems.


Figure 1: Meraki mesh APs

These systems are intended for enterprise use and have sầu price tags khổng lồ match. But if you"re interested in playing with the technology, inexpensive 802.11g based mesh APs are available from Open-Mesh. Be warned, however, that throughput via 11g meshes is very low, in the single digit Mbps range. This is fine for basic connectivity for tin nhắn, web browsing, etc. But not enough for high-unique đoạn phim streaming.

On a practical basis, however, consumers" main method for trying out wireless repeating are routers and APs with WDS built in. And with WDS added to some 802.11n routers, it"s now possible khổng lồ get double-digit bandwidths through a single-hop bridge.

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But WDS remains a công nghệ, not a standard và WDS isn"t tested as part of Wi-Fi Certification. As a result, manufacturers typically include weasel-words somewhere in their hàng hóa documentation that say that bridging and repeating features will work only with their own products. And even if you don"t find WDS interoperability disclaimers, good luchồng trying lớn get support from any vendor for a problem that involves any other vendor"s product!

The gist of all this is that products from different vendors with WDS bridging / repeating features are not guaranteed to work with each other! The industry has come a long way from the early days of WDS in terms of interoperability. But, again, there are no guarantees.

Chuyên mục: Tổng Hợp