Working with virtual machines often requires full access to network resources, but standard network emulation methods don't always meet specific needs. Many users face the need to run a physical machine within the guest operating system. WiFi adapter, rather than using virtual NAT or bridging. This may be necessary for security testing, traffic analysis, or working with specific drivers that don't function correctly on the host system.
The difficulty lies in the fact that, by default, Oracle VM VirtualBox doesn't provide direct access to the host machine's wireless interfaces for the guest OS. Instead, it emulates a network card that simply uses the computer's internet connection. For the virtual machine to "see" a real USB dongle or integrated module as a separate device, USB device passthrough must be enabled. This process requires installing an additional extension pack and properly configuring access rights.
In this article, we'll cover all configuration steps in detail, from installing the Extension Pack to setting up device filters. You'll learn how to avoid common errors when an adapter isn't listed as available, and how to ensure a stable connection. Understanding the operating principles USB passthrough will allow you to flexibly manage the network environment of your virtual laboratories.
Preparing the host system and installing extensions
The first and critical step is to install the extension pack. Oracle VM VirtualBox Extension PackWithout this component, functionality with USB devices, including WiFi adapters, will be limited to version 1.1 (OHCI), which is often insufficient for modern high-speed 802.11ac or ax modules. You must download a version of the package that exactly matches the version of your VirtualBox installation, as even the slightest mismatch can cause startup errors.
After downloading the extension file from the official website, close any running virtual machines and run the installer. The system will prompt you to confirm administrator privileges and accept the license agreement. During the installation, it's important to ensure that no kernel module-related errors appear in the installation logs, especially if you're running Linux. For Windows users, this process is usually seamless and only requires restarting the program interface.
⚠️ Important: Make sure the Extension Pack version is identical to the version of the main VirtualBox application. Using incompatible versions will result in virtual machines not starting or missing USB controllers in the settings.
Next, you need to check if the USB controller is enabled in the program's global settings. Go to the menu File → Settings → USB and make sure the checkbox next to the item is checked Enable USB controller. Here you should also select the controller version: for modern adapters, it is recommended to select USB 3.0 (xHCI), as this will ensure maximum throughput and connection stability when transferring large amounts of data.
Configuring a virtual machine to work with USB
After preparing the host, we move on to configuring the virtual machine itself. Shut down the target guest OS, if it's running, and open the settings window via the context menu or the "Configure" button. In the left panel, select USB, where a list of available device filters will open. This is where the magic of forwarding happens: you create a rule that forces VirtualBox to "take" the device from the host and hand it over to the guest.
To add a WiFi adapter, click the add new filter icon (the green plus sign on the right). Select your device from the list that appears. It may be listed by manufacturer name (e.g., Realtek, TP-Link, Intel) or as "Unknown device" if the drivers are not installed on the host. Once selected, a new line with a check mark will appear in the list, indicating that this device will be automatically intercepted when the virtual machine starts.
☑️ Check USB settings
It's important to understand that a device can only be active in one system at a time. Once the virtual machine starts and takes over the adapter, it will disappear from the host operating system's Device Manager. This is normal behavior and indicates that the passthrough mechanism is working correctly. If you need to return control of the adapter to the host, simply shut down the virtual machine or manually disable the device through the VirtualBox menu.
Troubleshooting Permissions Issues in Linux and Windows
The most common problem that users encounter is the absence of a device in the list of devices available for forwarding or an error starting the virtual machine with the code VERR_PDM_NO_USB_PORTSIn Linux operating systems, this is almost always related to USB port access rights. The user running VirtualBox must be a member of the group vboxusersWithout this, system restrictions simply will not allow the program to access the hardware.
To add a user to the required group, run the command in the terminal with superuser privileges. After running the command, you must completely log out of the user's session (login/logout) or restart the computer for the group policy changes to take effect. Simply restarting VirtualBox won't help in this case, as privileges are inherited from the login session.
sudo usermod -aG vboxusers $USERIn Windows, problems are most often related to missing filtering drivers or conflicts with antivirus software. Make sure the primary system's WiFi adapter is working correctly and doesn't have any yellow exclamation marks in the Device Manager. It's also worth checking whether your firewall or antivirus software is blocking the creation of virtual network interfaces, which are often used in conjunction with USB forwarding.
What should I do if the adapter is not visible in the list?
If the device doesn't appear in the list of available devices for filter creation, try physically disconnecting it and reconnecting it after starting VirtualBox. Also, make sure the host machine doesn't have any adapter manufacturer-specific software installed that could be blocking direct access to the device. In some cases, temporarily disabling automatic driver installation via Windows Update can help.
Features of WiFi adapters in guest OS
After successfully passing the device, the guest operating system will detect the new hardware. However, this does not guarantee instant internet access. The guest OS treats the passed adapter as a new, newly connected device, so it will require the appropriate settings. driversIf the guest system (for example, a lightweight Linux distribution) does not have built-in drivers for your WiFi module model, you will have to install them manually, possibly using an offline installer.
It's important to consider the architectural features of wireless networks. When forwarding a USB adapter, the virtual machine becomes a full-fledged member of the network, with its own MAC address (which can be emulated) and IP address. This differs from NAT mode, where all virtual machines are "hidden" behind a single host IP address. This approach is ideal for testing network utilities such as Aircrack-ng or Wireshark in monitoring mode.
| Parameter | NAT mode | USB Passthrough |
|---|---|---|
| Network access | Via host (shared IP) | Direct (separate IP) |
| Online visibility | Hidden behind the host router | Visible as a separate device |
| Monitoring mode | Unavailable | Available (with adapter support) |
| Host dependency | High (requires host driver) | Low (guest driver required) |
Using forwarding allows you to implement scenarios that are unavailable in normal mode. For example, you can run an access point inside a virtual machine while the main system continues to operate on the corporate network. Or you can test the network service under unstable connection conditions by artificially limiting the speed at the physical device level within the guest OS.
Diagnosis and troubleshooting of common errors
If the connection fails after all the settings, first check the device status in the guest operating system's Task Manager. Make sure the adapter isn't set to "Disabled" by software. It often happens that Windows or Linux in the guest operating system automatically puts the USB device into power-saving mode, which causes the connection to be lost or fails to establish. Disabling power saving in the device's properties may resolve this issue.
Another common situation is a driver version conflict. The driver installed on the host machine is not passed to the guest system. You need to install the driver that is compatible with the kernel version and operating system running in VirtualBox. If the host is running Windows 10 and the guest is running Kali Linux, the drivers will be completely different, and relying on automatic installation is not recommended.
If the adapter constantly disconnects or works erratically, try changing the USB controller settings in the machine configuration. Switching between OHCI, EHCI And xHCI This can dramatically change the stability of the adapter. Some older adapters work better in USB 2.0 emulation mode, while modern standards require the full 3.0 controller to be enabled.
Using the Security Audit Adapter
For information security professionals, the ability to forward a WiFi adapter to a virtual machine is an indispensable tool. This allows for isolating potentially dangerous traffic analysis tools from the main working environment. When running distributions like Kali Linux or Parrot OS With direct access to the hardware, you can switch the card to Monitor Mode to listen to the broadcast.
Full functionality requires chipsets that support packet injection and driver-level monitoring mode. Popular models based on these chipsets Atheros or Realtek (RTL8812AU series and similar) are often recommended for such purposes due to their open drivers and good support in the Linux community.
⚠️ Warning: Using a WiFi adapter in monitor mode and attacking wireless networks is only permitted on equipment you own or with written permission from the network owner. Unauthorized access to other people's networks is punishable by law.
When setting up a pentest environment, ensure the guest OS has sufficient resources. Handling real-time wireless traffic, especially packet sniffing, can be resource-intensive. Allocating sufficient RAM and using processor virtualization (VT-x/AMD-V) will significantly speed up the analysis process.
Why doesn't VirtualBox see the USB WiFi adapter in the list of devices?
The most common cause is a missing Extension Pack or a mismatch between its version and the program version. The second most common cause is the user not having access rights to the USB ports (this applies to Linux). Also, check if the device is being used by another process on the host machine.
Is it possible to forward a laptop's built-in WiFi module?
Technically, this is possible if the module is connected via USB (which is common in laptops). However, after forwarding, the built-in WiFi will stop working in the main system until the device is rebooted or manually reset. For desktop use, it's better to use an external USB adapter.
Does USB forwarding affect internet speed in a virtual machine?
USB passthrough overhead is minimal and has virtually no impact on data transfer speed. Speed will be limited by the capabilities of the WiFi adapter itself, signal quality, and wireless channel congestion, but not by virtualization.
Do I need to reconfigure WiFi after each VM launch?
If you've created a persistent device filter in the USB settings, the adapter will be automatically intercepted each time the virtual machine starts. However, connecting to a specific WiFi network (entering the password) within the guest OS may require reconnecting if the network profile isn't saved there.