Linux KVM: Disable virbr0 NAT Interface

To disable the virbr0 NAT interface in Linux KVM, you can edit the network configuration file for the virtual network.

Here are the steps to disable the virbr0 NAT interface in Linux KVM:

1. Locate the network configuration file: The network configuration file is typically stored in the /etc/libvirt/qemu directory, and has a .xml extension. Look for a file that corresponds to the virtual network you want to modify, and that contains the string “virbr0” in its name.
2. Stop the virtual network: Before editing the network configuration file, you need to stop the virtual network. You can do this by running the following command:

3. Edit the network configuration file: Once the virtual network is stopped, you can edit the network configuration file using a text editor of your choice. Look for the <forward mode='nat'> section and remove it, or comment it out by adding <!-- and --> around it.
4. Start the virtual network: After making your changes to the network configuration file, start the virtual network again by running the following command:

5. Verify the changes: To verify that the virbr0 NAT interface is disabled, you can run the following command:

If the virbr0 NAT interface is disabled, you should see the following output:

Note that the steps for disabling the virbr0 NAT interface may vary depending on the specific version of Linux and KVM that you are using. If you encounter any issues or have questions about disabling the virbr0 NAT interface, you may want to consult the documentation for your Linux distribution or consult with a knowledgeable Linux user for assistance.