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WDS vs Bridge Mode (WET)

Discussion in 'DD-WRT Firmware' started by cgondo, Sep 18, 2006.

  1. cgondo

    cgondo Network Guru Member


    I am designing a wireless backbone network however i would like to know the difference between the WDS mode and the pure Bridge mode. The scenario is to set 2 point-to-point connection from a central building to two other buildings. My options are:

    1. WDS (only...no AP function)
    2. WET (with MAC filtering to limit only the 2 other AP can connect and no one else)

    What are the advanatges of WDS compared to pure bridge? WHich mode is better for my application? What are the limitations of WDS and Bridge mode (ie. maybe only limited number of MAC is permitted behind a bridge?)

  2. pablito

    pablito Network Guru Member

    I'm not an expert but for some folks a bridge is faster. However a bridge will broadcast all the traffic and if you use MS networking or heavy local usage it is very noisy and becomes slower than desired (a good switch helps a little). A WDS has some advantages since you aren't broadcasting traffic that doesn't need to be at the other end. If you use WDS without it also being an AP than you don't get the 1/2 speed that you would on a WDS + AP setup.

    I'd say go with WDS if you are connecting several buildings (you can get some fault tolerance that way). Of course lock it down to the MACs, encrypt, and use directional antennas. Client mode is another option if it fits the needs.
  3. dvaskelis

    dvaskelis Network Guru Member

    WDS (bridging-only) is used to bridge multiple access points that also run in WDS (repeating) mode. It's a nifty approach to interconnect multiple single-radio APs wirelessly instead of through wired Ethernet. All devices share the same channel, so adding more WDS devices will reduce bandwidth end-to-end depending on the number of repeating WDS devices you have to pass through.

    WET is used to bridge a wireless network with a wired one. You can, if appropriate, add a second AP on a different channel on the bridged wired network.

    In general, you want to interconnect APs via Ethernet if you can for best performance. If you're connecting two buildings and cannot hardwire it, in most circumstances I'd probably have a WET in the second building and then add an AP on a different channel in the second building. No reason to add a WDS hop and cut bandwidth in half unless you're just trying to save money and double-duty the radio... in which case that's the definition of WDS.
  4. cgondo

    cgondo Network Guru Member

    I understand that if there is a hop between WDS it will degrade the bandwidth severely however my situation is 2 Point-to-point connection. Note i am not trying to use the WDS AP as a repeater. I am trying to compare connecting two point using WET mode and WDS mode.

    I will have separate AP to server the local buildings however the backhaul connection is my concern. If using WET it means the central building has to be configured with AP mode. If i use WDS, then no client association is allowed to the backhaul network (which is good since local AP will serve the clients).
  5. dvaskelis

    dvaskelis Network Guru Member

    If you're worried about clients associating with an AP, you can flip the bridge setup. Set up a closed private WPA-AES network with the WET bridge in the central building and an AP for it (with no other wireless clients) in the second building.
  6. __spc__

    __spc__ Network Guru Member

    In my property, I have a gateway WRT54G, WDS to two other WRT54G (not possible to lay cable). These second WRT54G do not 'see' each other, only the gateway, and each has a number of wired devices attached (no wireless clients).

    Is WDS the right thing to use here?

    (Apologies for going slightly off topic.)
  7. cgondo

    cgondo Network Guru Member

    OK, i guess i better pharaphrase the question.

    "What is the difference between WET(bridge) and WDS in a Point-to-point connection?"

    How do they differ technically?
  8. dvaskelis

    dvaskelis Network Guru Member

  9. DeepHunter

    DeepHunter LI Guru Member

    Thanks for those links, I think I am ready to try this, Question AP1 is hooked up to the cable internet in building A. We need better signal in building B. Which way would be better Set up another WRT54G as a wireless repeater for building a employees to connect to. OR Setup another WRT54G wired via cat5 to AP1?

    I have searched like crazy and have found no info on how to set up another 54g as a wired (into AP1) wireless AP. Anyone have any links. Will WPA work if AP2 is wired to AP1?

    Building B is about a 200 foot cable run from building A.

    If I can do the wired thing will throughput still be halfed like using WDS.
  10. DeepHunter

    DeepHunter LI Guru Member

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