[SOLVED] "NO DHCPOFFERS" Wifi Dell Inspiron 9400

[di98mase]

I have read a lot about this issue on the forum but the solutions provided have not solved my problem. I have an wifi network inteface (eth1) that has a signal but I cant connect to the Internet since I dont get an IP address from the dhcp-server (as far as I understand). I run Ubuntu 6.0.6 (Dapper) These are the outputs I get when I run different commands:




ifconf:

eth0 Link encap:Ethernet HWaddr 00:18:00:00:24:56
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:177

eth1 Link encap:Ethernet HWaddr 00:1B:77:24:56:4F
inet6 addr: fe80::21b:77ff:fe24:564f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:31232 errors:39 dropped:354 overruns:0 frame:0
TX packets:11 errors:0 dropped:172 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:14577 (14.2 KiB) TX bytes:7948 (7.7 KiB)
Interrupt:177 Memory:efcff000-efcfffff

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:781 errors:0 dropped:0 overruns:0 frame:0
TX packets:781 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:58992 (57.6 KiB) TX bytes:58992 (57.6 KiB)


my interfaces file looks like (passw removed):


# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

auto eth1
iface eth1 inet dhcp
wpa-driver wext
wpa-ssid Hemnet
wpa-ap-scan 1
wpa-proto RSN
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
wpa-psk c5b5454545454545454545454545455482593b50929e80e17d fee69b1a12beeb

pre-up wpa_supplicant -Bw -DLinux -ieth1 -c/etc/wpa_supplicant.conf
post-down killall -q wpa_supplicant
wireless-essid Hemnet
wireless-key s:ABCDEFG


my wpa_supplicatn.conf:


# Minimal /etc/wpa_supplicant.conf to associate with open
# access points. Please see
# /usr/share/doc/wpasupplicant/examples/README.wpa_s upplicant.conf.gz
# for more complete configuration parameters.
#
# Also see the other files in /usr/share/doc/wpasupplicant/examples/ for
# specific configuration examples.

# path to UNIX socket control interface
ctrl_interface=/var/run/wpa_supplicant

### Example of basic WPA-PSK secured AP
#network={
# ssid="ournet"
# psk="w243sd5f324asdf5123sadf54324"
#}

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel

network={
ssid="Hemnet"
psk="c787878789789789789797afb99a0b8f82593b50929e80e17d fee69b1a12beeb"
}


iwconfig:


eth1 IEEE 802.11g ESSID:"Hemnet"
Mode:Managed Frequency:2.437 GHz Access Point: 00:19:5B:D9:E0:DC
Bit Rate:24 Mb/s Tx-Power:15 dBm
Retry limit:15 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=55/100 Signal level=-75 dBm Noise level=-76 dBm
Rx invalid nwid:0 Rx invalid crypt:39 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:315 Missed beacon:0


iwlist:

eth1 Scan completed :

Cell 10 - Address: 00:19:00:00:00:DC
ESSID:"Hemnet"
Protocol:IEEE 802.11bg
Mode:Master
Channel:6
Encryption key:on
Bit Rates:54 Mb/s
Extra: Rates (Mb/s): 1 2 5.5 6 9 11 12 18 24 36 48 54
Quality=55/100 Signal level=-79 dBm Noise level=-75 dBm
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : PSK
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
Extra: Last beacon: 1708ms ago


lshw:

*-network
description: Wireless interface
product: Intel Corporation
vendor: Intel Corporation
physical id: 0
bus info: pci@0c:00.0
logical name: eth1
version: 02
serial: 00:1b:77:24:56:4f
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ipw3945 multicast=yes wireless=unassociated
resources: iomemory:efcff000-efcfffff irq:177
*-usb:0
description: Bluetooth wireless interface
product: BCM2045
vendor: Broadcom Corp
physical id: 1
bus info: usb@5:1.4.1
version: 1.00
capabilities: bluetooth usb-2.00
configuration: driver=hci_usb maxpower=0mA speed=12.0MB/s
*-network
description: Ethernet interface
product: BCM4401-B0 100Base-TX
vendor: Broadcom Corporation
physical id: 0
bus info: pci@03:00.0
logical name: eth0
version: 02
serial: 00:18:8b:d1:24:56
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical
configuration: broadcast=yes driver=b44 multicast=yes
resources: iomemory:ef9fe000-ef9fffff irq:177

lsmod:

Module Size Used by
isofs 37688 1
udf 88452 0
ipv6 265728 6
rfcomm 40216 0
l2cap 26244 5 rfcomm
ppdev 9220 0
speedstep_centrino 8400 1
cpufreq_userspace 4696 1
cpufreq_stats 5636 0
freq_table 4740 2 speedstep_centrino,cpufreq_stats
cpufreq_powersave 1920 0
cpufreq_ondemand 6428 0
cpufreq_conservative 7332 0
video 16260 0
tc1100_wmi 6916 0
sony_acpi 5644 0
pcc_acpi 12416 0
hotkey 11556 0
dev_acpi 11140 0
container 4608 0
button 6672 0
acpi_sbs 19980 0
battery 9988 1 acpi_sbs
ac 5252 1 acpi_sbs
i2c_acpi_ec 5120 1 acpi_sbs
i2c_core 21904 1 i2c_acpi_ec
nls_utf8 2176 2
ntfs 103536 2
nls_iso8859_1 4224 2
nls_cp437 5888 3
vfat 13440 2
fat 53020 1 vfat
dm_mod 58936 1
md_mod 72532 0
sbp2 24196 0
parport_pc 35780 0
lp 11844 0
parport 36296 3 ppdev,parport_pc,lp
af_packet 22920 6
arc4 2048 0
ieee80211_crypt_wep 4992 0
joydev 10048 0
tsdev 8000 0
rtc 13492 0
b44 25740 0
mii 5888 1 b44
ipw3945 126620 1
sdhci 14848 0
mmc_core 30104 1 sdhci
ieee80211 37064 1 ipw3945
ieee80211_crypt 6272 2 ieee80211_crypt_wep,ieee80211
pcspkr 2180 0
ieee80211_1_1_13 38216 0
ieee80211_1_1_13_crypt 6784 1 ieee80211_1_1_13
hci_usb 16660 0
bluetooth 49892 5 rfcomm,l2cap,hci_usb
psmouse 36100 0
usbhid 39904 0
serio_raw 7300 0
snd_hda_intel 18964 1
snd_hda_codec 154672 1 snd_hda_intel
hw_random 5652 0
snd_pcm_oss 53664 0
snd_mixer_oss 18688 1 snd_pcm_oss
snd_pcm 89864 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer 25220 1 snd_pcm
snd 55268 8 snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_ oss,snd_pcm,snd_timer
soundcore 10208 1 snd
snd_page_alloc 10632 2 snd_hda_intel,snd_pcm
shpchp 45632 0
pci_hotplug 29236 1 shpchp
intel_agp 22940 1
agpgart 34888 1 intel_agp
sr_mod 16932 1
cdrom 38560 1 sr_mod
sg 37920 0
evdev 9856 3
ext3 135688 1
jbd 58772 1 ext3
ide_generic 1536 0
ohci1394 35124 0
ieee1394 299832 2 sbp2,ohci1394
ehci_hcd 34184 0
uhci_hcd 33680 0
usbcore 130692 5 hci_usb,usbhid,ehci_hcd,uhci_hcd
sd_mod 19984 7
generic 5124 0
ata_piix 11012 13
libata 78992 1 ata_piix
scsi_mod 139496 5 sbp2,sr_mod,sg,sd_mod,libata
thermal 13576 0
processor 23360 2 speedstep_centrino,thermal
fan 4868 0
capability 5000 0
commoncap 7296 1 capability
vga16fb 13704 1
vgastate 10368 1 vga16fb
fbcon 42784 72
tileblit 2816 1 fbcon
font 8320 1 fbcon
bitblit 6272 1 fbcon
softcursor 2304 1 bitblit





Also I use WPA and I have not tried to remove the encryption.

What seems to be the problem? I have spent a long time trying to solve the problem but this is my last try...

/di98

[Lambert]

Try setting your config file up like this


network={
ssid="example"
proto=WPA
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
group=CCMP TKIP
psk=06b4be19da289f475aa46a33cb793029d4ab3db7a23ee9 2382eb0106c72ac7bb
priority=2
}


And if your ssid is not broadcasted add this line in there

scan_ssid=1

Also cycle your router off for 30 seconds and then power on and try to connect.

[kevdog]

There are so many things wrong with your configuration -- in so many ways!!

#1. Reset or delete or just copy your current /etc/network/interfaces file to a backup location, and just make a basic one:

auto lo
iface lo inet loopback

auto eth0
iface eth1 inet dhcp

auto eth1
iface eth1 inet dhcp

#2. Although it seems like want WPA2, I think you need to set up your wpa_supplicant.conf file like the following (yes I know this is different than what you have read):

ap_scan=1
ctrl_interface=/var/run/wpa_supplicant

network={
ssid="ESSID_IN_QUOTES"
scan_ssid=0
proto=WPA
key_mgmt=WPA-PSK
psk="ASCII PSK Password in Quotes" <----- Can put hex key here without quotes but make sure it is correct
pairwise=TKIP
group=TKIP
}

Im basing this on the following:
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK

Im just trying to match what is states about wpa2 on your iwlist scan statement to the settings in the file (you must have a linksys router)

Then try just connecting from the command line with the following (for you <interface>=eth1):
sudo ifconfig <interface> down
sudo dhclient -r <interface>
sudo wpa_supplicant -w -Dipw -i<interface> -c/etc/wpa_supplicant.conf -dd
sudo ifconfig <interface> up
sudo iwconfig <interface> mode Managed
sudo dhclient <interface>

Give me any output you generate if it doesnt work. We may have to play around with the cipher, key-mngmt in the conf file.
Are you certain it can connect to an unencrypted network??? Id confirm this first!

[di98mase]

Hi all,

thanks for your help.

This is the solution that made it work for me:

I removed the encryption on the router and restored interfaces according to you suggestions in the thread. The network worked immediately. After this I run with WEP also no problem. The next thing will be to run WPA but I will do that some other time...

Thanks.