code: def default_capture_file_name(self):
          
  
          capture_file_name = "{}_{}-{}_to_{}_{}-{}".format(self._nodes[0]["node"].name,
                                                            self._nodes[0]["adapter_number"],
                                                            self._nodes[0]["port_number"],
                                                            self._nodes[1]["node"].name,
                                                            self._nodes[1]["adapter_number"],
                                                            self._nodes[1]["port_number"])
          return re.sub("[^0-9A-Za-z_-]", "", capture_file_name) + ".pcap"
docs: :returns: File name for a capture on this link