On a wrt54gs, wds is probably enabled by default when applicable to be compatible with Linksys' WET hardware.  Many vendors do not support mixing wds with WPA however, limiting you to WEP for encryption.

I advise you disable encryption alltogether first to see if you can get bridging to work before you try with encryption.

Jochen Hebbrecht wrote:
  

Nicolas de Pesloüan schreef:
    

That beeing said, Jonathan might be right about the need for WDS... 
Can you have a look at the AP configuration, searching for a WDS setup 
? Because if it works on Windows, without WDS (if disabled or 
unavailable on the AP), then we can assume that WDS is not required, 
even on Linux (the wifi interface is able to receive traffic for 
another MAC).

If the AP is WDS enabled, then... WDS might be necessary... and 
nothing can be done if the driver for you wifi interface does not 
support it...
      

http://www.linksysinfo.org/forums/showthread.php?t=47118

I'm having the WRT54GS router, and the explanation above tells me how to 
configre WDS.
However, when I look in my admin panel, I cannot find a tab: "WDS". I 
guess my firmware is pretty old :-)
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