code: def unbind_filter(self, direction):
          
  
          if direction not in self._dynamips_direction:
              raise DynamipsError("Unknown direction {} to unbind filter:".format(direction))
          dynamips_direction = self._dynamips_direction[direction]
  
          yield from self._hypervisor.send("nio unbind_filter {name} {direction}".format(name=self._name,
                                                                                         direction=dynamips_direction))
  
          if direction == "in":
              self._input_filter = None
          elif direction == "out":
              self._output_filter = None
          elif direction == "both":
              self._input_filter = None
              self._output_filter = None
docs: Removes packet filter for this NIO.
  
          :param direction: "in", "out" or "both"