qubes-doc/privacy/anonymizing-your-mac-address.md

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Anonymizing your MAC Address

Although it is not the only metadata broadcast by network hardware, changing the default MAC Address of your hardware could be an important step in protecting privacy. Currently, Qubes OS does not automatically "anonymize" or spoof the MAC Address, so unless this gets implemented by default you can randomize your MAC Address with the following guide. The Network Manager method should work with both Qubes R4.0 and R3.2.

Upgrading and configuring Network Manager in Qubes

Newer versions of Network Manager have a robust set of options for randomizing MAC addresses, and can handle the entire process across reboots, sleep/wake cycles and different connection states. In particular, versions 1.4.2 and later should be well suited for Qubes. Qubes R4.0's default sys-net should have 1.8.2-4 by default.

Network Manager 1.4.2 or later is available from the Fedora 25 repository as well as the Debian 9 repository, which you can install by upgrading a Debian 8 template to version 9.

Check that Network Manager version is now at least 1.4.2:

$ sudo NetworkManager -V
1.4.2

Randomize a single connection

Right click on the Network Manager icon of your NetVM in the tray and click 'Edit Connections..'.

Select the connection to randomize and click Edit.

Select the Cloned MAC Address drop down and set to Random or Stable. Stable will generate a random address that persists until reboot, while Random will generate an address each time a link goes up.

Save the change and reconnect the connection (click on Network Manager tray icon and click disconnect under the connection, it should automatically reconnect).

Randomize all Ethernet and Wifi connections

These steps should be done inside a template to be used to create a NetVM as it relies on creating a config file that would otherwise be deleted after a reboot due to the nature of AppVMs.

Write the settings to a new file in the /etc/NetworkManager/conf.d/ directory, such as 00-macrandomize.conf. The following example enables Wifi and Ethernet MAC address randomization while scanning (not connected), and uses a randomly generated but persistent MAC address for each individual Wifi and Ethernet connection profile.

[device]
wifi.scan-rand-mac-address=yes

[connection]
wifi.cloned-mac-address=stable
ethernet.cloned-mac-address=stable
connection.stable-id=${CONNECTION}/${BOOT}

• stable in combination with ${CONNECTION}/${BOOT} generates a random address that persists until reboot.
• random generates a random address each time a link goes up.

To see all the available configuration options, refer to the man page: man nm-settings

Next, create a new NetVM using the edited template and assign network devices to it.

Finally, shutdown all VMs and change the settings of sys-firewall, etc. to use the new NetVM.

You can check the MAC address currently in use by looking at the status pages of your router device(s), or inside the NetVM with the command sudo ip link show.