Help With WDS

Discussion in 'Networking Issues' started by Matty007, Jun 18, 2008.

  1. Matty007

    Matty007 Addicted to LI Member


    I have a friend who wants to set up wireless in his building with a large coverage area for upstairs, and I know wds will work well for this, but because of where his initial router is, how would you go about chaining the routers?

    For example base router = A second router = B and so on.

    D - C - B

    Can you set it up this way?

  2. Matty007

    Matty007 Addicted to LI Member

    More info

    I thought I would add to my initial post to be a little more descriptive (plus my diagram came out wrong).

    normally when you set up a Wds you would create a network in a star pattern.

    Example A
    B C D

    With C being the location of the first router, well the building that we have has the router in the basement on the right side of the building, so the routers would have to link up to one another instead of all connecting the the first one.

    Now I have set up a wds before with just two routers without much problem, but before we bought the equipment I need to know if chaining the routers is a simple process or is there major draw backs to doing so?

    Also my initial post some how got mirrored A is supposed to connect to b, but I think you get my idea.

    Any help would be great thanks!!
  3. Matty007

    Matty007 Addicted to LI Member

    No one? Is there a better spot to post this?
  4. HennieM

    HennieM Network Guru Member

    Lots of posts on WDS on this site - use search.

    Quick answers:
    Setting up a longish WDS chain is just as easy as setting up 2. Just specify the MAC addresses of the ones that must connect.
    When you go with WDS, or any configuration where a single radio must repeat a signal wirelessly, your speed will go down by this factor:

    Speed after node n = 1/(n+1) of full speed

    Thus, if you have


    the speed between wiredPC and client would be 1/(1+2) = 1/3 of full wireless speed, as WDS+AP2 and WDS+AP3 need to repeat wireless signal.
  5. Matty007

    Matty007 Addicted to LI Member

    Thanks for the reply,

    I think that part of my original question though is is it a good idea to set up something like this, have people had good success with this? or can it become a headache with random problems?

    I'm I was fairly confident that this would work I was just wondering if it's a bad idea or if there was better alternatives.:)


  6. HennieM

    HennieM Network Guru Member

    In order to retain the highest speed, you need to minimize the WDS nodes that has to repeat wireless signal. Thus, with A being the base node (connected to internet, etc.)

    1) A-B-C-D

    with a client (wired or wireless) connected to D, would be slower than

    2) B-A-C-D

    with the same client connected to D.

    You therefore have to evaluate the trade-off in connection strength or speed found vs. the longer WDS chain but with better signal.

    You can even do
    which would give you redundancy in case one of the nodes dies, and your WDS net should find the best route. People have reported that this "find the best route" does not work so well, but you'll have to experiment for yourself I guess. Make sure though, if you try (3), that you have Spanning Tree protocol (SPT) enabled on ALL WDS nodes.

    If you use, for your WDS nodes, WRTs with Tomato, Thibor15c, or dd-wrt firmware, you should not have many troubles.
  7. Matty007

    Matty007 Addicted to LI Member

    Thanks HennieM!
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