def METHOD_NAME(self, interface_name, scope='universe', order=0):
    """ get IPv6 address
    interface_name is name of interface, e.g. 'eth0'
    scope is either 'link', 'universe' or 'host'
    order is zero based index as there can be more than one IP address
         for given scope and interface
    """
    ipv6 = self._get_interface_info_attr(interface_name, 'ipv6')
    return self._get_interface_address6_attr(ipv6, scope, order, 'address')