Intel 3945ABG stomps 2.4GHz connection to RT-AC66 - ideas?

[LoneWolf]

Side hobby: I repair broken laptops and upgrade them sometimes as well for fun. I have one with a pretty normal Intel 3945ABG wifi card in it at the moment. In the house, I have the RT-AC66R, and I have a Buffalo WLI-TX4-AG300N wireless bridge for the SO's desktop and our color laser. I have the bridge set to connect on the 2.4GHz band because signal strength was much better on the 5GHz. Bridge is set to 40MHz (it can be hardware switch-selected between 20MHz/40MHz)

Oddly enough, the laptop with the Intel card can see both the 2.4GHz and 5GHz SSIDs (it of course, can't connect to the 5GHz one), but connecting it will more often than not kill the connection between the router and the bridge. I didn't have this issue with my previous router (which was dual-band but not simultaneous), a Buffalo WZR-HP-G300NH(v1), which I ran at 2.4GHz 40MHz; everything worked fine. My own laptop is connected to the 5GHz band, and there are no issues there.

Any suggestions? This was a problem on both the .266 and .270 firmwares, and while the Intel wifi card is old, I've not had a problem with them in the past, and I can't see why this should be happening. For grins, I replaced the card with another identical one, and that didn't fix it, so I know it's not a defective Intel card.

 

[lucian]

3945abg cant connect to 2.4ghz

Actually my 3945abg can connect to the 5ghz ssid - but i dont get connection to the 2.4ghz ssid, just doesnt connect.

however it connects fine to 2.4ghz fritzbox7270.


any ideas?

 

[thiggins]

What is the problem, can't connect to 2.4 or "stomping" (please explain) the connection.

Drop the router back to auto or 20 MHz mode. Make sure router is set to mixed mode.