def METHOD_NAME(self, iface):
    """
    Bring an iface up.
    :param iface: Network interface, e.g. eth0
    :type iface: string
    """
    subprocess.call([f'/etc/init.d/net.{iface}', 'restart'])
    subprocess.call(['rc-update', 'add', f'net.{iface}', 'default'])