WLAN receiving DHCP-IP Address doesn't work Post: 302820745

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Top Forums Shell Programming and Scripting WLAN receiving DHCP-IP Address doesn't work Post 302820745 by zitronenschwarz on Thursday 13th of June 2013 11:26:16 AM

06-13-2013

Registered User

WLAN receiving DHCP-IP Address doesn't work

Hey guys,

I run my raspberry pi with a TP-Link Wlan-USB stick. The stick works out of the box with the pi-modded debian.

But eventhough the automatic connection to one of the saved WLAN-networks in the file /etc/wpa_supplicant/wpa_supplicant.conf works, my PI doesn't request or receive an IP-address (automatically).

I always have to login via ethernet and do a

Code:

sudo dhclient wlan0

manually.
Why?

I thought "well, whatever, no problem, I write a cronjob which runs this command every couple of minutes". But this doesn't solve the issue neither...

Please let me know what could be a better solution.

My script (not working when run as cronjob but manually it does):

Code:

#!/bin/bash

if [ `lsusb|grep WLAN|wc -l` -gt 0 ];
then
        if [ `iwconfig wlan0|head -n 1|tr -s " "|cut -d" " -f2` = "unassociated" ];
        then
                wpa_action wlan0 stop
                wpa_action wlan0 reload
                ifup wlan0
                #wpa_supplicant -i wlan0 -D wext -c /etc/wpa_supplicant/wpa_supplicant.conf -B
                #dhclient wlan0
        else
                if [ `iwconfig wlan0|head -n 1|tr -s " "|cut -d" " -f2` = "IEEE" ];
                then
                        if  [ `ifconfig wlan0|grep "inet addr"|tr -s " "|tr " " ":"|cut -d: -f 4|wc -m` = 0 ];
                        then
                                dhclient wlan0
                                for I in 1-4; do
                                        ping -c 1 google.com >/dev/null
                                done
                                if  [  ! `ifconfig wlan0|grep "inet addr"|tr -s " "|tr " " ":"|cut -d: -f 4|wc -m` -gt 10 ] && [ ! `ifconfig wlan0|grep "inet addr"|tr -s " "|tr " " ":"|cut -d: -f 4|wc -m` -lt 16 ];
                                then
                                         ifdown wlan0
                                fi
                        else
                                echo "`date`: WLAN0 - online `ifconfig wlan0|grep "inet addr"|tr -s " "|tr " " ":"|cut -d: -f 4`"
                        fi
                fi
        fi
fi

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LEARN ABOUT PLAN9

wpi

WPI(4)							   BSD Kernel Interfaces Manual 						    WPI(4)

NAME

     wpi -- Intel 3945ABG Wireless LAN IEEE 802.11 driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   device wpi
	   device wpifw
	   device pci
	   device wlan
	   device wlan_amrr
	   device firmware

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   if_wpi_load="YES"

DESCRIPTION

     The wpi driver provides support for the Intel 3945ABG Wireless network adapter wpi supports station, adhoc, and monitor mode operation.  Only
     one virtual interface may be configured at any time.  For more information on configuring this device, see ifconfig(8).

     This driver requires the firmware built with the wpifw module to work.

FILES

     /usr/share/doc/legal/intel_wpi/LICENSE  wpi firmware license

EXAMPLES

     Join an existing BSS network (i.e., connect to an access point):

	   ifconfig wlan0 create wlandev wpi0 inet 192.168.0.20 
	       netmask 0xffffff00

     Join a specific BSS network with network name ``my_net'':

	   ifconfig wlan0 create wlandev wpi0 ssid my_net up

     Join a specific BSS network with 64-bit WEP encryption:

	   ifconfig wlan0 create wlandev wpi0 ssid my_net 
		   wepmode on wepkey 0x1234567890 weptxkey 1 up

     Join a specific BSS network with 128-bit WEP encryption:

	   ifconfig wlan0 create wlandev wpi0 wlanmode adhoc ssid my_net 
	       wepmode on wepkey 0x01020304050607080910111213 weptxkey 1

DIAGNOSTICS

     wpi%d: could not load firmware image '%s'	The driver failed to load the firmware image using the firmware(9) subsystem.  Verify the wpifw
     firmware module is installed.

     wpi%d: fatal firmware error  An unknown error has occurred in the uploaded firmware, you may have to unload/reload the driver to continue.

     wpi%d: Radio transmitter is switched off  The hardware switch controlling the radio is currently turned off.  Data transmission is not possi-
     ble in this state.

BUGS

     Not all the error messages are documented here.

     Background scanning is not currently supported.

SEE ALSO

     wpifw(4), pci(4), wlan(4), wlan_ccmp(4), wlan_tkip(4), wlan_wep(4), ifconfig(8), wpa_supplicant(8).

AUTHORS

     The original wpi driver was written for OpenBSD by Damien Bergamini <damien.bergamini@free.fr>.  Benjamin Close <benjsc@FreeBSD.org> ported
     wpi to FreeBSD.

BSD
								  October 5, 2008							       BSD