I have a WRT45G (i think v3.1 but its mounted to an extremely hard place and I'm not checking it). I have WAP54G's connected to it as a wireless repeater and for that to happen I need to connect using the MAC address of the router. So I look at the status page and see the MAC address is xx:xx:xx:xx:CC:FF. I use that number but I can't connect. After several attempts and resets I decide to look at the bottom of the router to see what MAC address is listed there and to my surprise it listed a different MAC address xx:xx:xx:xx:CC:FE. I look at the MAC cloning section and confirmed its turned off and it was. I change the AP to the new MAC address and it still won't connect. Again after several attempts I try and test it using the other wireless AP modes. I've never tried AP Client and thought I would give it a shot. It did its scan and found a MAC address I have never seen before xx:xx:xx:xx:CC:00. I changed the reapter mode to that MAC and I connected right away. It definitely was that router as I was right next to it and it was showing 100% signal in the AP Client plus my router could now ping it. So it seems the router has 1 MAC address on its settings, another on its sticker, and it broadcasted another one. I suppose I could give it another MAC in the clone section to have a total of 4 different MAC address's but I just left it at what it wanted it to be. All numbers were the same except the last 4 numbers. I spent quite a lot of time troubleshooting this thing and gave linksys a piece of my mind. I'm in africa and it took some time to get this unit, it was brand new oobe and taking it back just wasn't an option for something that I could get working. I just wanted to know if I was alone in this or has anyone else had a similar problem. I run firmware v4.20.7 but it did the same in other versions including the stock and modified ones, i only upgraded to see if I could get my AP to connect (before I new about its MAC aliases). And of course if you can't get an AP to connect wirelessly to yours I suggest to find what MAC address it has.