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

zitronenschwarz

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LEARN ABOUT NETBSD

u3g

U3G(4)							   BSD Kernel Interfaces Manual 						    U3G(4)

NAME

     u3g -- USB support for 3G datacards

SYNOPSIS

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

	   u3ginit* at uhub? port ?
	   u3g* at uhub? port ?
	   ucom* at u3g?

DESCRIPTION

     The u3g driver provides support for the multiple USB-to-serial interfaces exposed by many 3G USB/PC Card modems.

     The device is accessed through the ucom(4) driver which makes it behave like a tty(4).

HARDWARE

     The u3g driver supports the following adapters:

     o	 Huawei E220 (E270?)
     o	 Huawei Mobile
     o	 Novatel MC950D
     o	 Option Globetrotter 3G
     o	 Option Globetrotter 3G Fusion (only 3G part, not WLAN)
     o	 Option Globetrotter 3G Fusion Quad (only 3G part, not WLAN)
     o	 Option Globetrotter 3G Quad
     o	 Vodafone Mobile Connect Card 3G

     The supported 3G cards provide the necessary modem port for ppp, pppd, or mpd connections as well as extra ports (depending on the specific
     device) to provide other functions (diagnostic port, SIM toolkit port).

SEE ALSO

     tty(4), ubsa(4), ucom(4), usb(4)

HISTORY

     The u3g driver appeared in NetBSD 5.0.  The ubsa(4) manual page was modified for u3g by Andrea Guzzo <aguzzo@anywi.com> in September 2008.

AUTHORS

     The u3g driver was written by Andrea Guzzo <aguzzo@anywi.com>.  Hardware for testing provided by AnyWi Technologies, Leiden, NL.

BSD
								   June 28, 2010							       BSD