Connect to a wireless network via Linux command line

This is a discussion on Connect to a wireless network via Linux command line within the Networking/Device Communication forums, part of the General Programming Boards category; Hi, Here is what I did Code: ifconfig wlan0 up iwlist wlan0 scan iwconfig wlan0 essid NETWORK_ID key WIRELESS_KEY 1. ...

  1. #1
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    Connect to a wireless network via Linux command line

    Hi,
    Here is what I did
    Code:
    ifconfig wlan0 up
    iwlist wlan0 scan
    iwconfig wlan0 essid NETWORK_ID key WIRELESS_KEY
    1. After iwconfig, I got this error
    Internet Systems Consortium DHCP Client V3.1.1
    Copyright 2004-2008 Internet Systems Consortium.
    All rights reserved.
    For info, please visit http://www.isc.org/sw/dhcp/

    wmaster0: unknown hardware address type 801
    wmaster0: unknown hardware address type 801
    Listening on LPF/wlan0/00:0e:9b:cd:4e:18
    Sending on LPF/wlan0/00:0e:9b:cd:4e:18
    Sending on Socket/fallback
    DHCPREQUEST of 192.168.1.3 on wlan0 to 255.255.255.255 port 67
    DHCPREQUEST of 192.168.1.3 on wlan0 to 255.255.255.255 port 67
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11
    DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
    No DHCPOFFERS received.
    Trying recorded lease 192.168.1.3
    PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.

    --- 192.168.1.1 ping statistics ---
    1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms

    No working leases in persistent database - sleeping.
    2. I also try to see if it is to use an ascii key, so I added the s: prefix to my key as
    Code:
    iwconfig wlan0 essid NETWORK_ID key s:WIRELESS_KEY
    But it will give error
    Error for wireless request "Set Encode" (8B2A) :
    SET failed on device wlan0 ; Invalid argument.
    3. Do I have to specify the type of the wireless network: WEP WAP etc? I am able to access several wireless networks: WEP, WAP and open without password.
    4. When I connect to the open wireless network, "iwconfig wlan0" gives "Access Point: Not-Associated".
    wlan0 IEEE 802.11bg ESSID:"bell"
    Mode:Managed Frequency:2.462 GHz Access Point: Not-Associated
    Bit Rate:9 Mb/s Tx-Power=27 dBm
    Retry min limit:7 RTS thrff Fragment thr=2352 B
    Encryption key:2D13-1B69-557F-3574-61CF-E091-51F9-4B70-0F9E-597B-2438-7B57-3468-0C35-D704-0D3E [2] Security modepen
    Power Managementff
    Link Quality=48/100 Signal level:-67 dBm Noise level=-69 dBm
    Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
    Tx excessive retries:0 Invalid misc:0 Missed beacon:0
    Does this mean the connection to the wireless network fail? But I still can surf on the internet.

    Thanks and regards!

  2. #2
    Registered User carrotcake1029's Avatar
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    I am running linux and have just successfully connected my card by doing the following:

    This will give u the essid and Access Point and channel.
    Code:
    iwlist scan
    For the key and essid arguments, keep the apostrophes. When entering your channel number, replace integer with, of course, the channel number supplied to you by iwlist.
    Code:
    iwconfig wlan0 key 'mykey' mode managed essid 'mychannel' channel integer ap 00:00:00:00:00:00
    Also you may or may not need to manually supply the access point. I had to because it wasn't being assigned correctly.

    Also be sure to take your device down before you start and start the device back up when you are done:
    Code:
    ifconfig wlan0 up/down
    Hopefully this helps.

    Edit: Just read your post in more detail and saw this line:
    Code:
    Access Point: Not-Associated
    So like I described, be sure to manually input your access point. It is the 6 hex numbers separated by colons given to you in iwlist.
    Last edited by carrotcake1029; 08-09-2009 at 12:07 PM.

  3. #3
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    First of all, if you are connecting to WPA, you cannot use iwconfig wlan0 essid NETWORK_ID key WIRELESS_KEY command. You will have to use wireless-tools or wpa_supplicant. I am using wpa_supplicant and it is kinda straight forward. Got to do some settings in wpa_supplicant.conf file, and nothing else.

    If you are using WEP, then try this.
    modprobe -r <your wireless module here>
    modprobe <your wireless module>
    iwconfig wlan0 up
    iwconfig wlan0 essid <network name> key <password>

  4. #4
    Registered User carrotcake1029's Avatar
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    Quote Originally Posted by valthyx View Post
    First of all, if you are connecting to WPA, you cannot use iwconfig wlan0 essid NETWORK_ID key WIRELESS_KEY command. You will have to use wireless-tools or wpa_supplicant.
    iwconfig is part of wireless-tools

    But yes, you are right, you do need to be running wpa_supplicant

  5. #5
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    iwconfig is part of wireless-tools
    owh really? I do not know that as i never got to use it.

    Anyway, how is your problem now, lehe?

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