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add a section to prevent hostname sending

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3hhh 2022-02-28 23:00:43 +01:00
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docs/privacy/anonymizing-your-mac-address.md
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@ -64,13 +64,27 @@ Finally, shutdown all VMs and change the settings of sys-firewall, etc. to use t
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`.
## Randomize your hostname
## Anonymize your hostname
DHCP requests also leak your hostname to your LAN. Since your hostname is usually `sys-net`, other network users can easily spot that you're using Qubes OS.
Unfortunately `NetworkManager` currently doesn't provide an option to disable that leak globally ([Gnome Bug 768076](https://bugzilla.gnome.org/show_bug.cgi?id=768076)).
Unfortunately `NetworkManager` currently doesn't provide an option to disable that leak globally ([Gnome Bug 768076](https://bugzilla.gnome.org/show_bug.cgi?id=768076)). However the below alternatives exist.
You may however use the following code to assign a random hostname to a VM during each of its startup. Please follow the instructions mentioned in the beginning to properly install it.
### Prevent hostname sending
`NetworkManager` can be configured to use `dhclient` for DHCP requests. `dhclient` has options to prevent the hostname from being sent. To do that, add a file to your `sys-net` template (usually the Fedora or Debian base template) named e.g. `/etc/NetworkManager/conf.d/dhclient.conf` with the following content:
```
[main]
dhcp=dhclient
```
Afterwards edit `/etc/dhcp/dhclient.conf` and remove or comment out the line starting with `send host-name`.
If you want to decide per connection, `NetworkManager` also provides an option to not send the hostname:
Edit the saved connection files at `/rw/config/NM-system-connections/*.nmconnection` and add the `dhcp-send-hostname=false` line to both the `[ipv4]` and the `[ipv6]` section.
### Randomize the hostname
Alternatively you may use the following code to assign a random hostname to a VM during each of its startup. Please follow the instructions mentioned in the beginning to properly install it.
```.bash
#!/bin/bash