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I am trying to connect to a wifi network which is secured by WEP encryption. The wifi is getting connected but the ip address is not obtaining.

My /etc/network/interfaces file content:

auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
auto wlan0

iface wlan0 inet dhcp

wireless-essid Research Lab
wireless-key s:6A844C3AE2
iface default inet dhcp

The result of iwconfig wlan0 command:

wlan0 IEEE 802.11bg ESSID:"Research Lab" Nickname:"<WIFI@REALTEK>"
      Mode:Managed Frequency:2.44 GHz Access Point: 00:3A:9A:00:2E:90
      Bit Rate:54 Mb/s Sensitivity:0/0
      Retry:off RTS thr:off Fragment thr:off
      Power Management:off
      Link Quality 96/100 Signal level=64/100 Noise level=0/100
      Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
      Tx excessive retries:0 Invalid misc:0 Missed beacon:0

The result of ifconfig wlan0 command:

wlan0    Link encap:Ethernet HWaddr 74:da:38:la:el:85
         UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:100
         RX bytes:0 (0.0B) TX bytes:4440 (4.3 KiB)

Clearly one can see that the wifi is getting connected but the inet address is not obtaining. Is there any solution for this problem?

  • Why do you think it is getting connected? What device is meant to be acting as the DHCP server? Perhaps it will show an error in its logs. I don't use WEP, is the s:<xxx> for the key some special WEP syntax? – joan Aug 24 '15 at 15:26
  • @joan my WEP key is like 6A844C3AE2 With this key I am able to connect to the wifi network in my windows laptop. So I have entered the line like wireless-key s:6A844C3AE2. I am sure it is connecting to the wifi network because iwconfig wlan0 displays the correct wifi ESSID which I want to connect. But the problem is it is not acquiring IP address. – Vijayenthiran Aug 25 '15 at 5:54
  • If it was connected you would have an IP address. You don't have an IP address so you are not connected. Check the logs. Are you sure that s: is meant to be there? – joan Aug 25 '15 at 7:06

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