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Fixing `airmon-ng` not working in Aircrack-ng on Ubuntu

Ubuntu 21

In this article, we will delve into the issue of airmon-ng not working in Aircrack-ng on Ubuntu and provide a step-by-step guide on how to fix it. This problem typically arises when you try to run airmon-ng start wlan0 and encounter an error message indicating that there are processes interfering with airmon-ng.

Quick Answer

To fix airmon-ng not working in Aircrack-ng on Ubuntu, you can try killing interfering processes using the command sudo airmon-ng check kill all. If that doesn’t work, you can downgrade libpcap to a compatible version or stop the network-manager process using sudo service network-manager stop. If all else fails, manually configure your wireless device to monitor mode using iwconfig.

Understanding the Issue

Before we delve into the solutions, it’s important to understand the issue at hand. The airmon-ng command is used to switch your wireless device into monitor mode. This is a prerequisite for using the Aircrack-ng suite, which is a set of tools for auditing wireless networks. If this command is not working, it can prevent you from using Aircrack-ng effectively.

The error message usually indicates that there are processes that may interfere with the functioning of airmon-ng. This can include network managers, dhclient processes, or other services that automatically manage your network interfaces.

Possible Solutions

There are several solutions that you can try to fix this issue. We will go through them one by one.

1. Killing Interfering Processes

The first solution involves running the command sudo airmon-ng check kill all. This command checks for and kills processes that could interfere with the functioning of airmon-ng.

Here is a breakdown of the command:

  • sudo: This prefix gives the command administrative privileges, which are necessary for killing processes.
  • airmon-ng: This is the command for managing monitor mode.
  • check kill: This command checks for interfering processes and kills them.
  • all: This parameter specifies that all interfering processes should be killed.

After running this command, try running airmon-ng start wlan0 again to see if the issue has been resolved.

2. Downgrading libpcap

Another possible solution is to downgrade libpcap to a version that is known to work with reaver. This solution may work if you are using a version of libpcap that is not compatible with reaver.

You can downgrade libpcap by running the following commands:

sudo apt-get remove libpcap0.8
sudo apt-get install libpcap0.8=1.1.1-2

These commands remove the current version of libpcap and install version 1.1.1-2.

3. Stopping the Network-Manager Process

The network-manager process can interfere with airmon-ng. To stop this process, you can run the command sudo service network-manager stop.

Here is a breakdown of the command:

  • sudo: This prefix gives the command administrative privileges.
  • service: This command is used to run a System V init script.
  • network-manager: This is the name of the process that you want to stop.
  • stop: This command stops the specified process.

After stopping the network-manager process, try running airmon-ng start wlan0 again to see if the issue has been resolved.

4. Manually Configuring the Wireless Device

If none of the above solutions work, you can try manually configuring your wireless device to monitor mode using iwconfig.

Here is the command to do this:

sudo ifconfig wlan0 down
sudo iwconfig wlan0 mode monitor
sudo ifconfig wlan0 up

These commands bring the wireless device down, switch it to monitor mode, and then bring it back up.

Conclusion

The airmon-ng not working issue in Aircrack-ng on Ubuntu can be a frustrating problem to encounter. However, with the solutions provided in this article, you should be able to resolve this issue and get back to auditing wireless networks. Remember to try each solution one by one and test to see if the issue has been resolved after each attempt. Good luck!

What is `airmon-ng` and why is it important in Aircrack-ng?

airmon-ng is a command used to switch a wireless device into monitor mode. Monitor mode is essential for using the Aircrack-ng suite, which is a set of tools for auditing wireless networks. It allows you to capture and analyze network packets, making it possible to perform various security assessments and crack Wi-Fi passwords.

Why am I encountering an error message when running `airmon-ng start wlan0`?

The error message typically indicates that there are processes interfering with airmon-ng. This can include network managers, dhclient processes, or other services that automatically manage your network interfaces. These processes need to be stopped or killed in order for airmon-ng to function properly.

How can I check and kill interfering processes?

You can use the command sudo airmon-ng check kill all to check for and kill interfering processes. This command runs airmon-ng with administrative privileges and checks for any processes that could interfere with its functioning. The all parameter ensures that all interfering processes are killed.

What should I do if killing interfering processes doesn’t solve the issue?

If killing interfering processes doesn’t work, you can try downgrading libpcap to a version that is known to work with reaver. This can be done by removing the current version of libpcap using sudo apt-get remove libpcap0.8 and then installing a specific version, such as libpcap0.8=1.1.1-2, using sudo apt-get install libpcap0.8=1.1.1-2.

How can I stop the `network-manager` process?

You can stop the network-manager process by running the command sudo service network-manager stop. This command uses administrative privileges to stop the specified process, allowing airmon-ng to function without interference.

What can I do if none of the above solutions work?

If the previous solutions don’t solve the issue, you can try manually configuring your wireless device to monitor mode using iwconfig. This involves bringing the wireless device down using sudo ifconfig wlan0 down, switching it to monitor mode with sudo iwconfig wlan0 mode monitor, and then bringing it back up using sudo ifconfig wlan0 up.

Are there any risks associated with using Aircrack-ng and `airmon-ng`?

It’s important to note that Aircrack-ng and airmon-ng are powerful tools that should be used responsibly and ethically. These tools are primarily intended for security professionals and network administrators to assess and secure their own networks. Engaging in unauthorized activities or attempting to crack the Wi-Fi passwords of others without their consent is illegal and unethical. Always ensure that you have the legal authority and proper permissions before using these tools.

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