Linux Wireless Commands

Linux Wireless Commands

Linux Wireless Commands 150 150 Roderick Derks

Great collection of Linux commands to connect to a wireless network. Many thanks to wirelessdefence.org.

Note not all commands work with all cards!

To connect your Linux machine to a WLAN using WPA, WPA2 or 802.1X you will need to use WPA Supplicant

Connecting to an OPEN / WEP WLAN (DHCP)
# iwconfig [interface] mode managed key [WEP key] (128 bit WEP use 26 hex characters, 64 bit WEP uses 10)
# iwconfig essid "[ESSID]" (Specify ESSID for the WLAN)
# dhclient [interface] (to receive an IP address, netmask, DNS server and default gateway from the Access Point)
# ping www.ajax.nl  (if you receive a reply you have access)

Connecting to an OPEN / WEP WLAN (Manual IP Setup)
It may be necessary to run some packet capture software (e.g. Ethereal) to determine the IP addresses of both the Default Gateway and DNS servers.
 
# iwconfig [interface] mode managed key [WEP key] (128 bit WEP use 26 hex characters, 64 bit WEP uses 10)
# iwconfig essid "[ESSID]"
# ifconfig [interface] [IP address] netmask [subnetmask]
# route add default gw [IP of default gateway] (Configure your default gateway; usually the IP of the Access Point)
# echo nameserver [IP address of DNS server]  >>  /etc/resolve.conf (Configure your DNS server)
# ping www.psv.nl (if you receive a reply you have access)

iwpriv Commands
 # iwpriv [interface] hostapd 1 (used to set card mode to hostapd e.g. for void11)
 
When the monitor mode patch is installed as per the Wireless Build HOWTO the following commands may be used to set the card into monitor mode.
 
# iwpriv [interface] monitor [A] [B]

[A]
 0 = disable monitor mode
 1 = enable monitor mode with Prism2 header
 2 = enable monitor mode with no Prism2

[B]
 Channel to monitor (1-14)

ifconfig Commands
Note: replace [interface] with your interface name as required (e.g. eth1, wlan0, ath0 etc.)
 
# ifconfig [interface] up (bring up specified interface)
# ifconfig [interface] down (take down specified interface)
# ifconfig [interface] [IP address] netmask [subnet-mask] (manually set IP and subnet-mask details)
# ifconfig [interface] hw ether [MAC] (Change the wireless cards MAC address, specify in format 11:11:11:11:11:11)
# macchanger –mac=XX:XX:XX:XX:XX:XX [interface]

iwconfig Command
# iwconfig [interface] mode master (set the card to act as an access point mode)
# iwconfig [interface] mode managed (set card to client mode on a network with an access point)
# iwconfig [interface] mode ad-hoc (set card to peer to peer networking or no access point mode)
# iwconfig [interface] mode monitor (set card to RFMON mode our favourite)
# iwconfig [interface] essid any (with some cards you may  disable the  ESSID  checking)
# iwconfig [interface] essid “your ssid_here” (configure ESSID for network)
# iwconfig [interface] key 1111-1111-1111-1111 (set 128 bit WEP key)
# iwconfig [interface] key 11111111 (set 64 bit WEP key)
# iwconfig [interface] s:mykey (set key as an ASCII string)
# iwconfig [interface] key off (disable WEP key)
# iwconfig [interface] key open (sets open mode, no authentication is used and card may accept non-encrypted sessions)
# iwconfig [interface] channel [channel no.] (set a channel 1-14)
# iwconfig [interface] channel auto (automatic channel selection)

iwconfig Command (cont)
# iwconfig [interface] freq 2.422G (channels can also be specified in GHz)
# iwconfig [interface] ap 11:11:11:11:11:11 (Force card to register AP address)
# iwconfig [interface] rate 11M (card will use the rate specified)
# iwconfig [interface] rate auto (select automatic rate)
# iwconfig [interface] rate auto 5.5M (card will use the rate specified and any rate below as required)

iwlist Command
iwlist is used to display some large chunk of information from a wireless network interface that is not displayed by iwconfig.
 
# iwlist [interface] scan (Give the list of Access Points and Ad-Hoc cells in range (ESSID, Quality, Frequency, Mode etc.) Note: In tests only worked with Atheros cards).
# iwlist [interface] channel (Give the list of available frequencies in the device and the number of channels).
# iwlist [interface] rate (List the bit-rates supported by the device).
# iwlist [interface] key (List the encryption key sizes supported and display all the encryption keys available in the device).
# iwlist [interface] power (List the various Power Management attributes and modes of the device).
# iwlist [interface] txpower (List the various Transmit Power available on the device).
# iwlist [interface] retry (List the transmit retry limits and retry lifetime on the device).
# iwlist [interface] ap (Give list of Access Points in range, and optionally the quality of link to them.  Deprecated in favour of scan)
# iwlist [interface] peers (Give the list of Peers associated/registered with this card).
# iwlist [interface] event (List the wireless events supported by this card).

Roderick Derks

Liefhebber van fietsen, van het oplossen van IT puzzels, en van het delen van informatie om anderen te helpen.

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