I'm using NS5 in station-wds mode with Mikrotik as ap bridge + Dynamic WDS, and it works very well for me too...
Nanostation5 loco, not M5 series and ROS 4.17 at Routerboard 333.
Well, any brand station will connect to Mikrotik AP-bridge. The fact Dynamic/Static WDS is enabled in AP does not necessarily mean the station is accept as station-wds.
The only way to see if the station-wds indeed is bridged as wds station is to see if node 'behind´ the bridge station-wds can be reached from AP in the same domain/network.
Only if you can show me this I (and MT!) will believe you...
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Rudy R. Puister
WISP operator based on MT routerboard & ROS.