Protocol Identifiers

This appendix defines the protocol identifiers that are used in protocol towers. Three types of protocol identifiers are supported:

• An octet string derived from OSI Object Identifiers (OIDs). The prefix of this protocol identifier (first octet) has the value 0 (zero). The suffix consists of the OSI OID encoded in ASN.1/BER. Companies can assign their own values by using their OIDs.

• An octet string derived from an interface UUID combined with a version number. This type (UUID_type_identifier) can be used for dynamically generated protocol identifiers where registration is not sufficient or desired. The encoding of this protocol identifier type is as follows:

  • Octet 0 contains the hexadecimal value 0d. This is a reserved protocol identifier prefix that indicates that the protocol ID is UUID derived.

  • Octets 1 to 16 inclusive contain the UUID, in little-endian format.

  • Octets 17 to 18 inclusive contain the major version number, in little-endian format.

  OSF maintains a registry of transfer syntax identifiers encoded by using UUID_type_identifiers. Currently there is one registered value for NDR. Hexadecimal values for the NDR syntax identifier fields are shown in NDR Transfer Syntax Identifier .

  Prefix	UUID	Version	Comments
  0d	8a885d04-1ceb-11c9-9fe8-08002b104860	01	Version 1.1 data representation protocol.

  Table: NDR Transfer Syntax Identifier

  Note:

  Contact OSF to obtain a listing of registered transfer syntaxes, including optional transfer syntaxes not specified by this document, or to register new transfer syntaxes.

• Single octet identifiers that are registered by the Open Software Foundation for commonly used protocols. Registered Single Octet Protocol Identifiers lists currently registered values.

Protocol ID for:	Identifier Value	Related Information	Comments
OSI TP4	05	T-Selector
OSI CLNS	06	NSAP
DOD TCP	07	port	port address is 16 bit unsigned integer, big endian order
DOD UDP	08	port	port address is 16 bit unsigned integer, big endian_order
DOD IP	09	host address	host address is 4 octets, big endian order
RPC connectionless protocol	0a	minor version	major version 4
RPC connection-oriented protocol	0b	minor version	major version 5
DNA Session Control	02	-
DNA Session Control V3	03	-
DNA NSP Transport	04	-
DNA Routing	06	-
Named Pipes	10	-	Microsoft Named Pipes
NetBIOS	11	-	Microsoft NetBIOS
NetBEUI	12	-	Microsoft NetBEUI
Netware SPX	13	-	Netware SPX transport-layer protocol
Netware IPX	14	-	Netware IPX transport-layer protocol
Appletalk Stream	16	endpoint
Appletalk Datagram	17	endpoint
Appletalk	18	NBP-style name
NetBIOS	19	-	CL over all protocols
VINES SPP	1A	endpoint	port address is 16-bit integer, big endian order
VINES IPC	1B	endpoint	port address is 16-bit integer, big endian order
StreetTalk	1C	StreetTalk name
Unix Domain socket	20	socket pathname
null	21	-
NetBIOS	22	NetBIOS name

Note:

Contact OSF to register a protocol identifier or for the format and semantics of the Related Information entries not given in the table.

Please note that the html version of this specification may contain formatting aberrations. The definitive version is available as an electronic publication on CD-ROM from The Open Group.