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Old 07-19-2006, 04:49 PM   #1
Registered: Aug 2003
Distribution: Debian, Ubuntu
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post-up problem with /etc/network/interfaces

Hi all,

I try to set up an asus 167g wlan usb device with ndiswrapper and wpa_supplicant. Ndiswrapper module loads fine at boot time, but I didn't manage wpa_supplicant to start automatically, too.
I wrote following into the /etc/network/interfaces file:
auto wlan0
iface wlan0 inet static
    post-up /sbin/ifconfig wlan0 mtu 1472
    post-up /sbin/wpa_supplicant -B -D ndiswrapper -i wlan0 -c /home/clemens/wpaconf
    wireless-essid MetalNet
After reboot, ps aux | grep wpa shows no running process. If started on console, wpa_supplicant works. I tried a
post-up echo "Hello world!" >> /tmp/ifconfigtest
in the interfaces file. No output in the specified file.

Does the ifup routine ignore some post-up/pre-up statements? And why? And how can I start the wpa_supplicant?

Thanks a lot,
Old 07-21-2006, 04:30 AM   #2
Registered: May 2001
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What I would do is run wpa_supplicant separately and before bringing up networking with the background and wait flags.
Old 01-01-2013, 03:50 AM   #3
LQ Newbie
Registered: Jan 2013
Posts: 1

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Same Issue...

I have the same problem of post-up not working. And the answer doesn't really address the problem. More of a work around.

post-up 'should' work, shouldn't it ?
Old 01-16-2013, 07:06 PM   #4
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Registered: Jan 2013
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I'm not a wireless guru on linux but I believe your issue may not be caused by post-up not working but a wireless standard.
as far as i know the interface is only considered up providing it can configure it. if its using wpa security then its possible that its not able to associate with the access point thus causing linux to not think its up.

Try setting your AP to no wireless security and then put post-up echo "Hello world!" >> /tmp/ifconfigtest and see if it fires. if it fires with wireless security OFF then its due to the fact that without the wpa_supplicant it can't connect to the AP and linux is saying the interface is still down.

if it is the wireless security then what I would do is put the /sbin/wpa_supplicant -B -D ndiswrapper -i wlan0 -c /home/clemens/wpaconf in rc.local wich is the very LAST thing ran after all networking and everything else and then in rc.local after that line put ifup wlan0 and turn off the auto in interfaces for the wlan0

otherwise I'm at a loss as well like I said I don't know much about linux wireless support but I know on windows without the right wpa password it will connect to the wireless ap but not configure it leaving it in a "down" state with a 169.x.x.x ip address.


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