ifconfig wlan0 up is not starting in debian

SIOCSIFFLAGS: No such file or directory
rmvprasadAsked:
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rmvprasadAuthor Commented:
debianuser:/home/debianuser# ifconfig wlan0 up
SIOCSIFFLAGS: No such file or directory

iwconfig says

debianuser:/home/debianuser# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wmaster0  no wireless extensions.

wlan0     IEEE 802.11  ESSID:""  
          Mode:Managed  Frequency:2.412 GHz  Access Point: Not-Associated  
          Tx-Power=0 dBm  
          Retry min limit:7   RTS thr:off   Fragment thr=2352 B  
          Encryption key:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

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rindiCommented:
What wireless NIC are you using? Is any security in place? what do you get with iwlist wlan0 scan?
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rmvprasadAuthor Commented:
yes this is a secured network.

 lspci | grep Broadcom\ Corporation gave the following result
03:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)

debianuser:/etc/init.d# iwlist wlan0 scan gave the following result
wlan0     Interface doesn't support scanning : Network is down

I have downloaded the following driver
CARD: Broadcom Corporation BCM4312 802.11a/b/g (rev 02)
Driver: sp36689.exe from the url ftp://ftp.hp.com/pub/softpaq/sp36501-37000/sp36684.exe located at the site
http://www.burnthesorbonne.com/ndiswrapper/b.html

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rmvprasadAuthor Commented:
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rindiCommented:
As far as I know the most broadcom NIC's are supported directly by Linux. So there is probably no need to use ndiswrapper for this.

Use apt-get or if you are using a GUI the package manager GUI tool your are used to use and search for broadcom, then install what it finds and reboot. Also install wpa-supplicant, as that is required to connect to secured LANs (but first try connecting with no security set on the router to test the system). If you get a connection, re-enable WPA on the router and configure WPA_Supplicant to work with your router. Check the readme's on how to setup the configuration file (there are also examples you can copy, modify and use).
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rmvprasadAuthor Commented:
when does this error come

SIOCSIFFLAGS: No such file or directory
even when I try using linux drivers I am getting this error when I try to up the ifconfig
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rindiCommented:
Have you tried no security?
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marcrieraCommented:
Hello there,

long ago I've found myself on the same trouble.

Check this instructions :

http://linuxwireless.org/en/users/Drivers/b43#fw-b43-new

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