[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="c787878789789789789797afb99a0b8f82593b50929e8 0e17dfee69b1a12beeb" } iwconfig: eth1 IEEE 802.11g ESSID:"Hemnet" Mode:Managed Frequency:2.437 GHz Access Point: 00:19:5B9:E0C Bit Rate:24 Mb/s Tx-Power:15 dBm Retry limit:15 RTS thrff Fragment thrff Power Managementff 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: 00:19:00:00:00C ESSID:"Hemnet" Protocol:IEEE 802.11bg Mode:Master Channel:6 Encryption keyn 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=06b4be19da289f475aa46a33cb793029d4ab3db7a23ee92382eb0106c72ac7bb
       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.