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WDS Explained

How To: Setting up WDS Bridging / Repeating
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WDS stands for Wireless Distribution System and is a feature supported by an increasing number of 802.11 access points. Simply put, it enables single-radio APs to be wirelessly connected 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 traffic.

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 to enterprise-grade, i.e. expensive, 802.11b products in the late 1990’s. Many of these implementations were based around a medium access control (MAC) layer design originated by a company called Choice Microsystems.

APs with wireless bridging features remained as high-priced items until fall 2002 when wireless bridging moved into consumer priced wireless products. D-Link first broke the artificially high wireless bridging price barrier by releasing a free upgrade to its DWL-900AP+ Access Point. This upgrade created the first consumer-priced WLAN product to support bridging and repeating (see below). Other companies soon followed with similar upgrades, and also introduced dedicated Wireless Bridges, such as Linksys’ WET11 [reviewed here].

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 chipset started to hit the market at the beginning of 2003 that the WDS term started to be commonly used. Broadcom apparently included WDS support in its AP reference design code and WDS-enabled 802.11g APs have since become more widely available.

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

Wireless Bridging in which WDS APs communicate only with each other and don’t allow wireless clients or Stations (STA) to access them

Wireless Repeating in which APs communicate with each other and with wireless STAs

Two disadvantages to using WDS are :

Wireless throughput is cut approximately in half for each WDS repeating "hop", i.e. an AP that data flows through before hitting the wired network. This is because all transmissions use the same channel and radio and must be retransmitted to reach the wired LAN.

Dynamically assigned and rotated encryption keys are not supported in a WDS connection. This means that Wi-Fi Protected Access (WPA) and other dynamic key assignment technology may not be used. Static WEP keys only may be used in a WDS connection, including any STAs that associate to a WDS repeating AP.

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  • 0 Hide
    robabrams , May 22, 2010 12:21 PM
    Very good article. I am having some problems of my own with a pair of Sitecomm Wireless routers (WL-312 and WL-610).

    I am going to reset them both back to factory defaults and start again using this guide.
  • 0 Hide
    Anonymous , October 21, 2011 2:22 AM
    i used a thomson tg585 and a netfaste iad2. WDS "worked" but: many packet loss while pinging and speed is below 10KB/S ! ...
  • 0 Hide
    Anonymous , November 12, 2011 5:02 PM
    Thank you!

    Great article that answered my questions.
  • 0 Hide
    Anonymous , February 13, 2012 11:47 PM
    Thanks for the well organized and comprehensive explanation about WDS.
    I like this kind of writing so much.
    (JSuparman-Jakarta)
  • 0 Hide
    knightmurphy , May 7, 2012 8:58 PM
    I simply love you, that's all I have to say.
    I've been wrecking my brains around WDS repeater (1st example) all day. And then I came across your article, and everything became clear. And everything worked on the 1st friggin' try!
    I managed to get my routers working like the 1st scheme (1 main router, one repeater) from 2 different vendors, and not only that, one of the routers is seriously old.
    So many many thanks!

    (In case anyone is wondering, main router = relatively new TL-WR1043ND + repeater router = the ancient 3COM OfficeConnect Wireless 11g Cable/DSL Router. Upgrades both firmwares before attempting)
  • 0 Hide
    Anonymous , February 26, 2013 12:59 PM
    Hi,

    is there a way to make a wired connection between the client and the second AP (in your case ASUS)?

    Also should everything be on the same main IP ie 192.168.1.***, because my two access points have preset IPs the one 192.168.1.254 and the second one 192.168.0.254. Should I change them to 192.168.1.250 and 192.168.1.230 for them to work together?
  • 0 Hide
    Anton Kizernis , March 20, 2013 1:44 AM
    Muchas gracias!
  • 0 Hide
    Eugenio Rios , August 30, 2013 4:00 PM
    So, I´m having trouble here... I´ve got: a) a gateway router with DHCP activated: DIR-655 from D-Link (192.168.0.1). b) AP TP-Link TL-WR741ND (192.168.0.2), and c) another AP, same brand (192.168.0.3). Both AP's are connected wirelessly to the Gateway, DHCP turned off, all have the same SSID, same password, same channel, yet, I can´t seem to get them to work as if it were just one SSID, my smartphone gets authentication error and my computer sees three ssid's with the same name, different signal strengths. What can I do to roam freely in the house with just one SSID? what am I missing? Thank you for this guide, it´s awesome.
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