Message-ID: <521D0EA2.2070105@ilande.co.uk> (sfid-20130827_224119_452117_E8944634)
Date: Tue, 27 Aug 2013 21:40:02 +0100
From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
MIME-Version: 1.0
To: Larry Finger <Larry.Finger@lwfinger.net>
CC: linux-wireless@vger.kernel.org
References: <5217B01D.4000609@ilande.co.uk> <521B9A74.60603@ilande.co.uk> <521CD266.5010801@lwfinger.net>
In-Reply-To: <521CD266.5010801@lwfinger.net>
Subject: Re: Problems associating to AP with rtl8192cu driver
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Sender: linux-wireless-owner@vger.kernel.org

On 27/08/13 17:23, Larry Finger wrote:

Hi Larry,

> I just retested and this message was posted from what lsusb says is a
> "Bus 001 Device 007: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un
> 802.11n Wireless Adapter [Realtek RTL8188CUS]" connected to an AP using
> WPA(1).

I'm actually testing a dongle from a Raspberry Pi that I've been 
experiencing issues with under load with the Realtek-written 8192cu 
driver. My understanding is that it is an OEM RTL8188CUS adapter from 
here: http://thepihut.com/products/usb-wifi-adapter-for-the-raspberry-pi.

> My kernel is 3.11.0-rc6-wl+ from the wireless-testing tree. I have built
> 3.11-rc7-wl+, but not yet rebooted. Before I boot into that kernel, I
> will build and test the mainline kernel, but it should not make a
> difference as the only code differences between wireless-testing and the
> mainline trees deal with cleaning up some sparse endian issues.
>
> What is the make/model of the AP that fails? Is its firmware the latest
> available? Just to confirm, you are running WPA1 encryption.

It seems to be all of the ones I'm testing :/  Currently that's an old 
Netgear DG834G, a desktop PC running Debian Wheezy/hostapd using a 
zd1211rw-based WiFi dongle, and an O2 Wireless box (rebadged Thomson). 
The problem seems to be that association is difficult, and even when it 
does associate then the AP appears to drop out every minute or so.

The rtl8192cu firmware is that supplied with Debian Wheezy, while the AP 
firmware should also be reasonably up-to-date. Access to all APs is fine 
using an Android phone, the zd1211rw desktop PC and a laptop with an 
iwlwifi driver. The APs are set to advertise both WPA and WPA2 encryption.

> Do you still have the wireshark file from the failed attempt? If so,
> could you filter out the traffic from APs and stations other than the
> units trying to make the connection, and send me (privately) the trimmed
> file?

Yes - I'm not sure if it's exactly that attempt, but I do have a 
representative wireshark trace of this which I will send to you privately.

> For completeness, I have tested WPA2 with Netgear WNDR3300 and WNDR3400
> running standard firmware, WPA1 with a Linksys WRT54GL running openWRT
> Kamikaze fw, and WEP with a Linksys WRT54G V5 running standard fw.

Okay. So perhaps there is something slightly different about this 
particular WiFi dongle...


Many thanks,

Mark.