01. WiFi Interfaces Management

List Available WiFi Interfaces

ip link show
iwconfig

Check Channels Supported by WiFi card

iwlist chan
iwlist <interface> chan

Get Full Technical Info about Device

Get info such as:

• Supported channels/frequencies
• Supported bandwidths
• Supported interface modes (e.g. AP, monitor...)

iw dev # to get phy# value
iw phy phy<value> info # value is 0, 1, 2...

To get technical info about all WiFi interfaces:

iw list

Increase WiFi TX Power

Does not work on every WiFi card

iw reg set B0  # Set regulatory domain to Bolivia
iwconfig wlan0 txpower 30  # Put interface TX Power to 30 Dbm

If returns an error, try second method:

ifconfig wlan0 down
iw reg set BO
ifconfig wlan0 up
iwconfig wlan0 channel 13
iwconfig wlan0 txpower 30

Alternative method:

iw wlan0 set txpower fixed 3000

Set Interface in Monitor Mode

Manual method:

iw dev wlan0 interface add mon0 type monitor
ifconfig mon0 up
iw dev mon0 set channel <channel>  # Set the interface on a specific channel
iw dev mon0 info  # Check interface status

Automatic method:

airmon-ng start wlan0

Note: In some cases, some processes (e.g. NetworkManager, wpa_supplicant) might interfere with other tools from aircrack-ng suite. They can be all killed using:

airmon-ng check kill

Delete interface in monitor mode:

iw dev wlan0 del

List Devices in Monitor Mode

iwconfig | grep -i monitor

Test Card is Working Well in Monitor Mode

airodump-ng wlan1 --band ag -M -U --wps --beacons -w captureallthewireless
# --band a for 5Ghz
# --band g for 2.4 GHz

#ifconfig wlan0
#aireplay-ng wlan0 -9
10:09:24 Trying broadcast probe requests..

--band <abg>: 'b' and 'g' uses 2.4GHz and 'a' uses 5GHz

Injection Test

Test if WiFi device can perform injection:

aireplay-ng -9 mon0
aireplay-ng -9 -i mon0 mon1  # Attack (replay) tests (with 2 wifi cards in monitor mode)

Control Channel & Bandwidth of Interface in Monitor Mode

Check interface channel & frequency info:

iw dev wlan0 info | grep channel

Set interface to specific channel & to bandwidth = 40MHz:

iw dev wlan0 set channel <channel_number> HT40+
iw dev wlan0 set channel <channel_number> HT40-

Change interface channel

iwconfig <interface> channel <channel_number>