iwconfig is dedicated to the wireless interfaces. It is used to set the parameters of the network interface which are specific to the wireless operation.

Check WIFI setting, including current signal strength setting:

[root@linux ~]# iwconfig 

Example:

[root@linux ~]# iwconfig wlan0
 
 wlan0     IEEE 802.11g  ESSID:"OSU_PUB"  
          Mode:Managed  Frequency:2.427 GHz  Access Point: 00:0D:9D:C6:38:2D   
          Bit Rate=48 Mb/s   Tx-Power=20 dBm   Sensitivity=8/0  
          Retry limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=91/100  Signal level=-39 dBm  Noise level=-87 dBm
          Rx invalid nwid:0  Rx invalid crypt:860  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:39   Missed beacon:8

To enagle WLAN interface:

[root@linux ~]# ifconfig wlan0 up

To change WIFI card transmitter power:

[root@linux ~]# iwconfig wlan0 txpower <value in mW>

Note: In most countries 100mW is maximum permitted transmission power for WIFI cards.

If you can’t increase power due to current country set in properties you can change country code to les restrictive one (for example Bolivia “BO”)

[root@linux ~]# iw reg est BO

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