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boop
Asked: 2014-11-13 20:02:42 +0800 CST

Aircrack-ng, using airmon-ng to change to monitor mode

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I've followed this tutorial on installing aircrack on Ubuntu 14.04: https://www.youtube.com/watch?v=xdvGZlUzfRs&src_vid=OF0UjeoTXoI&feature=iv&annotation_id=annotation_1882595149

I had to tweak a few things to get it to download successfully, but here is what I'm having issues with (and what I can't find a solution for):

This command:

sudo airodump-ng mon0

of which I get the error:

Interface mon0:  
ioctl(SIOCGIFINDEX) failed: No such device

The command iwconfig shows:

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11abg  ESSID:"nameofmynetwork"  
          Mode:Managed  Frequency:5.765 GHz  Access Point: 05:B1:51:42:A1:5D   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

Regarding mon0, what is it? I tried some solutions, such as killing processes and updating to the latest aircrack, but I still receive an error.

Any help is appreciated!

aircrack-ng

6 Answers

  1. you don't need to use airmon-ng at all. you can simply:

    sudo ifconfig wlan0 down

    than go on with

    sudo iwconfig wlan0 mode monitor

    and finally

    sudo ifconfig wlan0 up

    thats basically what airmon-ng does.

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  2. You need to read more about how to use aircrack-ng.

    The command you executed, sudo airodump-ng mon0, tells your computer to start capturing packets on the interface called mon0, but you don't have that interface yet, that's why it tells you No such device.

    The general steps in using aircrack-ng is:

    1. sudo airmon-ng start wlan0

      • This puts your wireless interface into monitor mode, which is the mode where you can capture all packets, even if they weren't directed to your computer. What the command actually does is it creates another interface called mon0, which you can see when you do iwconfig. This is the command that you probably didn't execute. If you did run it but you can't see mon0 afterwards, let us know what was the command's output.

    2. sudo airodump-ng <options> mon0

      • This starts capturing packets.

    3. sudo aireplay-ng <options> mon0

      • You use this to attempt to increase the number of IVs being captured so you can easily crack the password.

    4. sudo aircrack-ng <options> <file>

      • This is the application that then cracks the capture you took to extract the password.
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  3. The problem is with the name of the interface. Use the following commands:

    Start your wireless interface in monitoring mode

    airmon-ng

    Kill all the interfering processes

    airmon-ng check kill

    Instead of airodump-ng mon0, type this airodump-ng wlan0mon

    Please let me know if this works for you.

    • 1

  4. From what i've seen, in the latest ubuntu version (15.10) there is a problem when enabling monitor mode on mon0.

    To do it clean and clear, use this command to kill any process that can cause problems sudo airmon-ng check kill , then use this command to enable monitor mode on mon0 sudo airmon-ng start wlan0 .

    Now you can use mon0 with other *-ng commands.

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  5. Okay, first of all let's start with killing all processes with sudo airmon-ng check kill , then enabling monitor mode with sudo airmon-ng start wlan0 , now the answer to your question is in the output of this command. Notice that it says in the bottom (experimental wl monitor mode vif enabled for [phy0]wlan0 on [phy0]prism0) for me it says prism0 this is the interface that was created for me when I used the airmon-ng start wlan0 command which is in general called mon0 but it's not always the same so you need to check the name of the one that was created for you and use it in the next command. For example in my case, to start capturing packets I will type airodump-ng prism0 not mon0. I hope this answers your question.

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  6. if airodump-ng mon0 doesnt works for you; give the previous one command as; "airmon-ng start wlp3s0" rather than "airmon-ng start wlan0" because wlan0 works for network on lan and wlp3s0 works for wireless network and then insert command "airodump-ng mon0" this will surely work for you too

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