Message-ID: <4E2454EC.1050900@lwfinger.net> (sfid-20110718_174459_059759_123BD63E)
Date: Mon, 18 Jul 2011 10:44:44 -0500
From: Larry Finger <Larry.Finger@lwfinger.net>
MIME-Version: 1.0
To: Stefan Assmann <sassmann@redhat.com>
CC: ali@internetdog.org, wireless <linux-wireless@vger.kernel.org>
Subject: Re: r8712u issue
References: <4E2051F3.20103@redhat.com> <4E205984.5040803@lwfinger.net> <4E23E56C.9000202@redhat.com> <20110718082709.GA8390@internetdog.org> <4E23F2E0.3050200@redhat.com> <4E2448D2.50502@lwfinger.net> <4E244AC6.2030306@redhat.com>
In-Reply-To: <4E244AC6.2030306@redhat.com>
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Sender: linux-wireless-owner@vger.kernel.org

On 07/18/2011 10:01 AM, Stefan Assmann wrote:
> On 18.07.2011 16:53, Larry Finger wrote:
>> On 07/18/2011 03:46 AM, Stefan Assmann wrote:
>>> On 18.07.2011 10:27, Ali Bahar wrote:
>>>> Stefan,
>>>>
>>>> I'd like to reproduce this problem. So I'd appreciate some specifics,
>>>> as asked below.
>>>>
>>>>
>>>> On Mon, Jul 18, 2011 at 09:49:00AM +0200, Stefan Assmann wrote:
>>>>> On 15.07.2011 17:15, Larry Finger wrote:
>>>>>> On 07/15/2011 09:42 AM, Stefan Assmann wrote:
>>>>
>>>>>>> driver. The problem I'm currently facing is that the driver does not
>>>>>>> recognize any network disconnects. So whenever the network goes down the
>>>>>>> driver will still report it's connected and thus doesn't reconnect when
>>>>>>> the network is up again.
>>>>
>>>>
>>>>> The system is a headless debian squeeze with a self build vanilla 2.6.39
>>>>> kernel. The network is handled by debian scripts I just added the following
>>>>> to /etc/network/interfaces:
>>>>> auto wlan0
>>>>> iface wlan0 inet dhcp
>>>>> wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
>>>>>
>>>>> No NM involved.
>>>>
>>>> So wpa_supplicant is controlling (and presumably monitoring) the
>>>> connection.
>>>> How are you seeing that (to quote the above) "the network goes down"
>>>> and that the driver reports that "it's connected"?
>>>> (Typically, I use only ifconfig and iwconfig, but those don't monitor
>>>> the connection.)
>>>
>>> OK, so I first recognized the problem when I rebooted my AP and the host
>>> in question didn't get back online. Checking the host itself it seemed
>>> that the network is doing fine, ifconfig showed the interface has an IP
>>> but I couldn't ping any hosts. After an ifdown ; ifup cycle everything
>>> was back to normal.
>>> I pulled the power from the AP, waited a few minutes and checked back.
>>> The ifconfig output still showed that the device had its IP.
>>>
>>>>>> When this situation occurs, what is output to the dmesg log?
>>>>>
>>>>> Sorry, I don't have the output at hand but IIRC basically nothing special
>>>>> occurred in dmesg. The interface even keeps it's IP although the wireless
>>>>> was long gone.
>>>>
>>>> So ifconfig shows the IP#. I'm assuming that it no longer shows a
>>>> state of "UP".
>>>
>>> I would assume so, but I'll have to reproduce to make sure.
>>>
>>>> This'd seem an inane question, but I must ask: What exactly do you
>>>> mean by the wireless being "gone"? Which GUI/utility/effect do you
>>>> see? Is it a powered-down AP, roaming, iwconfig's output, or what?
>>>
>>> I pulled the power from the AP. :)
>>>
>>>>> Ccing Ali Bahar to this reply, since he has seen something similar.
>>>>
>>>> To clarify: I just meant that I've seen quite a number of similar
>>>> inconsistencies in my testing as well as in my analysis of the code.
>>>> So, when I read your post, it came as no surprise to me. These'll get
>>>> fixed ... uh, let's hope soon! ;-)
>>>
>>> I see. :)
>>
>> Please post your wpa_supplicant.conf. In particular, what is the value for
>> scan_ssid?
>
> ctrl_interface=/var/run/wpa_supplicant
> eapol_version=1
> ap_scan=2
>
> network={
>          ssid="<ssid>"
>          id_str="<ssid>"
>          priority=5
>          proto=RSN
>          key_mgmt=WPA-PSK
>          psk=<psk>
> }
>
> Should I try again with scan_ssid=1 ? From reading the man page this
> makes a difference if the ssid is hidden, which is not the case.

Yes. It also changes the scan behavior.

Larry