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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SYNOPSIS

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DESCRIPTION

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OVERVIEW

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OPTIONS

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SEE ALSO

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Linux								    2010-10-01								  UKOPP(1)