?? LEFT := 1, RIGHT := 110 ??

  TYPE
    nat$cn_pdu_header = record
      destination_address: nat$system_identifier,
      source_address: nat$system_identifier,
      data_length: 0 .. 0ffff(16),
      destination_sap_id: nat$cn_sap_id,
      source_sap_id: nat$cn_sap_id,
      control: 0 .. 0ff(16),
    recend;

    CONST
      nac$3a_header_length = 3;

*copyc nat$network_address
*copyc nat$cn_interface
