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+
+Network Working Group J. Reynolds
+Request for Comments: 924 J. Postel
+ ISI
+Obsoletes: RFCs 901, 880, 840 October 1984
+
+
+ OFFICIAL ARPA-INTERNET PROTOCOLS
+
+
+STATUS OF THIS MEMO
+
+ This memo is an official status report on the protocols used in the
+ ARPA-Internet community. Distribution of this memo is unlimited.
+
+INTRODUCTION
+
+ This RFC identifies the documents specifying the official protocols
+ used in the Internet. Comments indicate any revisions or changes
+ planned.
+
+ To first order, the official protocols are those in the "Internet
+ Protocol Transition Workbook" (IPTW) dated March 1982. There are
+ several protocols in use that are not in the IPTW. A few of the
+ protocols in the IPTW have been revised. Notably, the mail protocols
+ have been revised and issued as a volume titled "Internet Mail
+ Protocols" dated November 1982. Telnet and the most useful Telnet
+ options have been revised and issued as a volume titled "Internet
+ Telnet Protocol and Options" (ITP) dated June 1983. Some protocols
+ have not been revised for many years, these are found in the old
+ "ARPANET Protocol Handbook" (APH) dated January 1978. There is also
+ a volume of protocol related information called the "Internet
+ Protocol Implementers Guide" (IPIG) dated August 1982.
+
+ This document is organized as a sketchy outline. The entries are
+ protocols (e.g., Transmission Control Protocol). In each entry there
+ are notes on status, specification, comments, other references,
+ dependencies, and contact.
+
+ The STATUS is one of: required, recommended, elective, or
+ experimental.
+
+ The SPECIFICATION identifies the protocol defining documents.
+
+ The COMMENTS describe any differences from the specification or
+ problems with the protocol.
+
+ The OTHER REFERENCES identify documents that comment on or expand
+ on the protocol.
+
+ The DEPENDENCIES indicate what other protocols are called upon by
+ this protocol.
+
+
+
+Reynolds & Postel [Page 1]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ The CONTACT indicates a person who can answer questions about the
+ protocol.
+
+ In particular, the status may be:
+
+ required
+
+ - all hosts must implement the required protocol,
+
+ recommended
+
+ - all hosts are encouraged to implement the recommended
+ protocol,
+
+ elective
+
+ - hosts may implement or not the elective protocol,
+
+ experimental
+
+ - hosts should not implement the experimental protocol
+ unless they are participating in the experiment and have
+ coordinated their use of this protocol with the contact
+ person, and
+
+ none
+
+ - this is not a protocol.
+
+ For further information about protocols in general, please
+ contact:
+
+ Joyce Reynolds
+ USC - Information Sciences Institute
+ 4676 Admiralty Way
+ Marina del Rey, California 90292-6695
+
+ Phone: (213) 822-1511
+
+ ARPA mail: JKREYNOLDS@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 2]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+OVERVIEW
+
+ Catenet Model ------------------------------------------------------
+
+ STATUS: None
+
+ SPECIFICATION: IEN 48 (in IPTW)
+
+ COMMENTS:
+
+ Gives an overview of the organization and principles of the
+ Internet.
+
+ Could be revised and expanded.
+
+ OTHER REFERENCES:
+
+ RFC 871 - A Perspective on the ARPANET Reference Model
+
+ DEPENDENCIES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 3]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+NETWORK LEVEL
+
+ Internet Protocol --------------------------------------------- (IP)
+
+ STATUS: Required
+
+ SPECIFICATION: RFC 791 (in IPTW)
+
+ COMMENTS:
+
+ This is the universal protocol of the Internet. This datagram
+ protocol provides the universal addressing of hosts in the
+ Internet.
+
+ A few minor problems have been noted in this document.
+
+ The most serious is a bit of confusion in the route options.
+ The route options have a pointer that indicates which octet of
+ the route is the next to be used. The confusion is between the
+ phrases "the pointer is relative to this option" and "the
+ smallest legal value for the pointer is 4". If you are
+ confused, forget about the relative part, the pointer begins
+ at 4.
+
+ Another important point is the alternate reassembly procedure
+ suggested in RFC 815.
+
+ Note that ICMP is defined to be an integral part of IP. You
+ have not completed an implementation of IP if it does not
+ include ICMP.
+
+ OTHER REFERENCES:
+
+ RFC 815 (in IPIG) - IP Datagram Reassembly Algorithms
+
+ RFC 814 (in IPIG) - Names, Addresses, Ports, and Routes
+
+ RFC 816 (in IPIG) - Fault Isolation and Recovery
+
+ RFC 817 (in IPIG) - Modularity and Efficiency in Protocol
+ Implementation
+
+ MIL-STD-1777 - Military Standard Internet Protocol
+
+ DEPENDENCIES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+Reynolds & Postel [Page 4]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Internet Control Message Protocol --------------------------- (ICMP)
+
+ STATUS: Required
+
+ SPECIFICATION: RFC 792 (in IPTW)
+
+ COMMENTS:
+
+ The control messages and error reports that go with the
+ Internet Protocol.
+
+ A few minor errors in the document have been noted.
+ Suggestions have been made for additional types of redirect
+ message and additional destination unreachable messages.
+
+ A proposal for two additional ICMP message types is made in
+ RFC 917 "Internet Subnets", Address Format Request (A1=17), and
+ Address Format Reply (A2=18). Use of these ICMP types is
+ experimental.
+
+ Note that ICMP is defined to be an integral part of IP. You
+ have not completed an implementation of IP if it does not
+ include ICMP.
+
+ OTHER REFERENCES: RFC 917
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 5]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+HOST LEVEL
+
+ User Datagram Protocol --------------------------------------- (UDP)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 768 (in IPTW)
+
+ COMMENTS:
+
+ Provides a datagram service to applications. Adds port
+ addressing to the IP services.
+
+ The only change noted for the UDP specification is a minor
+ clarification that if in computing the checksum a padding octet
+ is used for the computation it is not transmitted or counted in
+ the length.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Transmission Control Protocol -------------------------------- (TCP)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 793 (in IPTW)
+
+ COMMENTS:
+
+ Provides reliable end-to-end data stream service.
+
+ Many comments and corrections have been received for the TCP
+ specification document. These are primarily document bugs
+ rather than protocol bugs.
+
+ Event Processing Section: There are many minor corrections and
+ clarifications needed in this section.
+
+ Push: There are still some phrases in the document that give a
+ "record mark" flavor to the push. These should be further
+ clarified. The push is not a record mark.
+
+ Urgent: Page 17 is wrong. The urgent pointer points to the
+ last octet of urgent data (not to the first octet of non-ungent
+ data).
+
+
+
+Reynolds & Postel [Page 6]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Listening Servers: Several comments have been received on
+ difficulties with contacting listening servers. There should
+ be some discussion of implementation issues for servers, and
+ some notes on alternative models of system and process
+ organization for servers.
+
+ Maximum Segment Size: The maximum segment size option should
+ be generalized and clarified. It can be used to either
+ increase or decrease the maximum segment size from the default.
+ The TCP Maximum Segment Size is the IP Maximum Datagram Size
+ minus forty. The default IP Maximum Datagram Size if 576. The
+ default TCP Maximum Segment Size is 536. For further
+ discussion, see RFC 879.
+
+ Idle Connections: There have been questions about
+ automatically closing idle connections. Idle connections are
+ ok, and should not be closed. There are several cases where
+ idle connections arise, for example, in Telnet when a user is
+ thinking for a long time following a message from the server
+ computer before his next input. There is no TCP "probe"
+ mechanism, and none is needed.
+
+ Queued Receive Data on Closing: There are several points where
+ it is not clear from the description what to do about data
+ received by the TCP but not yet passed to the user,
+ particularly when the connection is being closed. In general,
+ the data is to be kept to give to the user if he does a RECV
+ call.
+
+ Out of Order Segments: The description says that segments that
+ arrive out of order, that is, are not exactly the next segment
+ to be processed, may be kept on hand. It should also point out
+ that there is a very large performance penalty for not doing
+ so.
+
+ User Time Out: This is the time out started on an open or send
+ call. If this user time out occurs the user should be
+ notified, but the connection should not be closed or the TCB
+ deleted. The user should explicitly ABORT the connection if he
+ wants to give up.
+
+ OTHER REFERENCES:
+
+ RFC 813 (in IPIG) - Window and Acknowledgement Strategy in TCP
+
+ RFC 814 (in IPIG) - Names, Addresses, Ports, and Routes
+
+ RFC 816 (in IPIG) - Fault Isolation and Recovery
+
+
+
+Reynolds & Postel [Page 7]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ RFC 817 (in IPIG) - Modularity and Efficiency in Protocol
+ Implementation
+
+ RFC 879 - TCP Maximum Segment Size
+
+ RFC 889 - Internet Delay Experiments
+
+ RFC 896 - TCP/IP Congestion Control
+
+ MIL-STD-1778 - Military Standard Transmission Control Protocol
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Host Monitoring Protocol ------------------------------------- (HMP)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 869
+
+ COMMENTS:
+
+ This is a good tool for debugging protocol implementations in
+ remotely located computers.
+
+ This protocol is used to monitor Internet gateways and the
+ TACs.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Hinden@BBN-UNIX.ARPA
+
+ Cross Net Debugger ------------------------------------------ (XNET)
+
+ STATUS: Elective
+
+ SPECIFICATION: IEN 158
+
+ COMMENTS:
+
+ A debugging protocol, allows debugger like access to remote
+ systems.
+
+ This specification should be updated and reissued as an RFC.
+
+ OTHER REFERENCES: RFC 643
+
+
+Reynolds & Postel [Page 8]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ "Stub" Exterior Gateway Protocol ----------------------------- (EGP)
+
+ STATUS: Recommended for Gateways
+
+ SPECIFICATION: RFC 888, RFC 904
+
+ COMMENTS:
+
+ The protocol used between gateways of different administrations
+ to exchange routing information.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES: RFC 827, RFC 890
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Mills@USC-ISID.ARPA
+
+ Gateway Gateway Protocol ------------------------------------- (GGP)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 823
+
+ COMMENTS:
+
+ The gateway protocol now used in the core gateways.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Brescia@BBN-UNIX.ARPA
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 9]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Multiplexing Protocol ---------------------------------------- (MUX)
+
+ STATUS: Experimental
+
+ SPECIFICATION: IEN 90
+
+ COMMENTS:
+
+ Defines a capability to combine several segments from different
+ higher level protocols in one IP datagram.
+
+ No current experiment in progress. There is some question as
+ to the extent to which the sharing this protocol envisions can
+ actually take place. Also, there are some issues about the
+ information captured in the multiplexing header being (a)
+ insufficient, or (b) over specific.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Stream Protocol ----------------------------------------------- (ST)
+
+ STATUS: Experimental
+
+ SPECIFICATION: IEN 119
+
+ COMMENTS:
+
+ A gateway resource allocation protocol designed for use in
+ multihost real time applications.
+
+ The implementation of this protocol has evolved and may no
+ longer be consistent with this specification. The document
+ should be updated and issued as an RFC.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: jwf@LL-EN.ARPA
+
+
+Reynolds & Postel [Page 10]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Network Voice Protocol ------------------------------------ (NVP-II)
+
+ STATUS: Experimental
+
+ SPECIFICATION: ISI Internal Memo
+
+ COMMENTS:
+
+ Defines the procedures for real time voice conferencing.
+
+ The specification is an ISI Internal Memo which should be
+ updated and issued as an RFC.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES: RFC 741
+
+ DEPENDENCIES: Internet Protocol, Stream Protocol
+
+ CONTACT: Casner@USC-ISIB.ARPA
+
+ Reliable Data Protocol --------------------------------------- (RDP)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 908
+
+ COMMENTS:
+
+ This protocol is designed to efficiently support the bulk
+ transfer of data for such host monitoring and control
+ applications as loading/dumping and remote debugging. The
+ protocol is intended to be simple to implement but still be
+ efficient in environments where there may be long transmission
+ delays and loss or non-sequential delivery of message segments.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Internet Protocol
+
+ CONTACT: CWelles@BBN-UNIX.ARPA
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 11]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+APPLICATION LEVEL
+
+ Telnet Protocol ------------------------------------------- (TELNET)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 854 (in "Internet Telnet Protocol and
+ Options")
+
+ COMMENTS:
+
+ The protocol for remote terminal access.
+
+ This has been revised since the IPTW. RFC 764 in IPTW is now
+ obsolete.
+
+ OTHER REFERENCES:
+
+ MIL-STD-1782 - Telnet Protocol and Options (TELNET)
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 12]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Telnet Options ------------------------------------ (TELNET-OPTIONS)
+
+ STATUS: Elective
+
+ SPECIFICATION: General description of options: RFC 855
+ (in "Internet Telnet Protocol and Options")
+
+ Number Name RFC NIC ITP APH USE
+ ------ --------------------------------- --- ----- --- --- ---
+ 0 Binary Transmission 856 ----- yes obs yes
+ 1 Echo 857 ----- yes obs yes
+ 2 Reconnection ... 15391 no yes no
+ 3 Suppress Go Ahead 858 ----- yes obs yes
+ 4 Approx Message Size Negotiation ... 15393 no yes no
+ 5 Status 859 ----- yes obs yes
+ 6 Timing Mark 860 ----- yes obs yes
+ 7 Remote Controlled Trans and Echo 726 39237 no yes no
+ 8 Output Line Width ... 20196 no yes no
+ 9 Output Page Size ... 20197 no yes no
+ 10 Output Carriage-Return Disposition 652 31155 no yes no
+ 11 Output Horizontal Tabstops 653 31156 no yes no
+ 12 Output Horizontal Tab Disposition 654 31157 no yes no
+ 13 Output Formfeed Disposition 655 31158 no yes no
+ 14 Output Vertical Tabstops 656 31159 no yes no
+ 15 Output Vertical Tab Disposition 657 31160 no yes no
+ 16 Output Linefeed Disposition 658 31161 no yes no
+ 17 Extended ASCII 698 32964 no yes no
+ 18 Logout 727 40025 no yes no
+ 19 Byte Macro 735 42083 no yes no
+ 20 Data Entry Terminal 732 41762 no yes no
+ 21 SUPDUP 734 736 42213 no yes no
+ 22 SUPDUP Output 749 45449 no no no
+ 23 Send Location 779 ----- no no no
+ 24 Terminal Type 884 ----- no no yes
+ 25 End of Record 885 ----- no no yes
+ 255 Extended-Options-List 861 ----- yes obs yes
+
+ (obs = obsolete)
+
+ The ITP column indicates if the specification is included in the
+ Internet Telnet Protocol and Options. The APH column indicates if
+ the specification is included in the ARPANET Protocol Handbook.
+ The USE column of the table above indicates which options are in
+ general use.
+
+ COMMENTS:
+
+ The Binary Transmission, Echo, Suppress Go Ahead, Status,
+ Timing Mark, and Extended Options List options have been
+
+
+Reynolds & Postel [Page 13]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ recently updated and reissued. These are the most frequently
+ implemented options.
+
+ The remaining options should be reviewed and the useful ones
+ should be revised and reissued. The others should be
+ eliminated.
+
+ The following are recommended: Binary Transmission, Echo,
+ Suppress Go Ahead, Status, Timing Mark, and Extended Options
+ List.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Telnet
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ File Transfer Protocol --------------------------------------- (FTP)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 765 (in IPTW)
+
+ COMMENTS:
+
+ The protocol for moving files between Internet hosts. Provides
+ for access control and negotiation of file parameters.
+
+ There are a number of minor corrections to be made. A major
+ change is the deletion of the mail commands, and a major
+ clarification is needed in the discussion of the management of
+ the data connection. Also, a suggestion has been made to
+ include some directory manipulation commands (RFC 775).
+
+ Even though the MAIL features are defined in this document,
+ they are not to be used. The SMTP protocol is to be used for
+ all mail service in the Internet.
+
+ Data Connection Management:
+
+ a. Default Data Connection Ports: All FTP implementations
+ must support use of the default data connection ports, and
+ only the User-PI may initiate the use of non-default ports.
+
+ b. Negotiating Non-Default Data Ports: The User-PI may
+ specify a non-default user side data port with the PORT
+ command. The User-PI may request the server side to
+ identify a non-default server side data port with the PASV
+ command. Since a connection is defined by the pair of
+
+
+Reynolds & Postel [Page 14]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ addresses, either of these actions is enough to get a
+ different data connection, still it is permitted to do both
+ commands to use new ports on both ends of the data
+ connection.
+
+ c. Reuse of the Data Connection: When using the stream
+ mode of data transfer the end of the file must be indicated
+ by closing the connection. This causes a problem if
+ multiple files are to be transfered in the session, due to
+ need for TCP to hold the connection record for a time out
+ period to guarantee the reliable communication. Thus the
+ connection can not be reopened at once.
+
+ There are two solutions to this problem. The first is to
+ negotiate a non-default port (as in (b) above). The
+ second is to use another transfer mode.
+
+ A comment on transfer modes. The stream transfer mode is
+ inherently unreliable, since one can not determine if the
+ connection closed prematurely or not. The other transfer
+ modes (Block, Compressed) do not close the connection to
+ indicate the end of file. They have enough FTP encoding
+ that the data connection can be parsed to determine the
+ end of the file. Thus using these modes one can leave
+ the data connection open for multiple file transfers.
+
+ Why this was not a problem with the old NCP FTP:
+
+ The NCP was designed with only the ARPANET in mind.
+ The ARPANET provides very reliable service, and the
+ NCP counted on it. If any packet of data from an NCP
+ connection were lost or damaged by the network the NCP
+ could not recover. It is a tribute to the ARPANET
+ designers that the NCP FTP worked so well.
+
+ The TCP is designed to provide reliable connections
+ over many different types of networks and
+ interconnections of networks. TCP must cope with a
+ set of networks that can not promise to work as well
+ as the ARPANET. TCP must make its own provisions for
+ end-to-end recovery from lost or damaged packets.
+ This leads to the need for the connection phase-down
+ time-out. The NCP never had to deal with
+ acknowledgements or retransmissions or many other
+ things the TCP must do to make connection reliable in
+ a more complex world.
+
+
+
+
+
+Reynolds & Postel [Page 15]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ LIST and NLST:
+
+ There is some confusion about the LIST an NLST commands, and
+ what is appropriate to return. Some clarification and
+ motivation for these commands should be added to the
+ specification.
+
+ OTHER REFERENCES:
+
+ RFC 678 - Document File Format Standards
+
+ MIL-STD-1780 - File Transfer Protocol (FTP)
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Trivial File Transfer Protocol ------------------------------ (TFTP)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 783 (in IPTW)
+
+ COMMENTS:
+
+ A very simple file moving protocol, no access control is
+ provided.
+
+ This is in use in several local networks.
+
+ Ambiguities in the interpretation of several of the transfer
+ modes should be clarified, and additional transfer modes could
+ be defined. Additional error codes could be defined to more
+ clearly identify problems.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 16]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Simple File Transfer Protocol ------------------------------- (SFTP)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 913
+
+ COMMENTS:
+
+ SFTP is a simple file transfer protocol. It fills the need of
+ people wanting a protocol that is more useful than TFTP but
+ easier to implement (and less powerful) than FTP. SFTP
+ supports user access control, file transfers, directory
+ listing, directory changing, file renaming and deleting.
+
+ SFTP can be implemented with any reliable 8-bit byte stream
+ oriented protocol, this document describes its TCP
+ specification. SFTP uses only one TCP connection; whereas TFTP
+ implements a connection over UDP, and FTP uses two TCP
+ connections (one using the TELNET protocol).
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: MKL@MIT-XX.ARPA
+
+ Simple Mail Transfer Protocol ------------------------------- (SMTP)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 821 (in "Internet Mail Protocols")
+
+ COMMENTS:
+
+ The procedure for transmitting computer mail between hosts.
+
+ This has been revised since the IPTW, it is in the "Internet
+ Mail Protocols" volume of November 1982. RFC 788 (in IPTW) is
+ obsolete.
+
+ There have been many misunderstandings and errors in the early
+ implementations. Some documentation of these problems can be
+ found in the file [ISIF]<SMTP>MAIL.ERRORS.
+
+ Some minor differences between RFC 821 and RFC 822 should be
+ resolved.
+
+
+Reynolds & Postel [Page 17]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ OTHER REFERENCES:
+
+ RFC 822 - Mail Header Format Standards
+
+ This has been revised since the IPTW, it is in the "Internet
+ Mail Protocols" volume of November 1982. RFC 733 (in IPTW)
+ is obsolete. Further revision of RFC 822 is needed to
+ correct some minor errors in the details of the
+ specification.
+
+ MIL-STD-1781 - Simple Mail Transfer Protocol (SMTP)
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Resource Location Protocol ----------------------------------- (RLP)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 887
+
+ COMMENTS:
+
+ A resource location protocol for use in the ARPA-Internet.
+ This protocol utilizes the User Datagram Protocol (UDP) which
+ in turn calls on the Internet Protocol to deliver its
+ datagrams.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: User Datagram Protocol
+
+ CONTACT: Accetta@CMU-CS-A.ARPA
+
+ Loader Debugger Protocol ------------------------------------- (LDP)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 909
+
+ COMMENTS:
+
+ Specifies a protocol for loading, dumping and debugging target
+ machines from hosts in a network environment. It is also
+ designed to accommodate a variety of target CPU types. It
+ provides a powerful set of debugging services, while at the
+ same time, it is structured so that a simple subset may be
+
+
+
+Reynolds & Postel [Page 18]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ implemented in applications like boot loading where efficiency
+ and space are at a premium.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Reliable Data Protocol
+
+ CONTACT: Hinden@BBN-UNIX.ARPA
+
+ Remote Job Entry --------------------------------------------- (RJE)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 407 (in APH)
+
+ COMMENTS:
+
+ The general protocol for submitting batch jobs and retrieving
+ the results.
+
+ Some changes needed for use with TCP.
+
+ No known active implementations.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: File Transfer Protocol
+ Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Remote Job Service ---------------------------------------- (NETRJS)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 740 (in APH)
+
+ COMMENTS:
+
+ A special protocol for submitting batch jobs and retrieving the
+ results used with the UCLA IBM OS system.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ Revision in progress.
+
+ OTHER REFERENCES:
+
+
+
+Reynolds & Postel [Page 19]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Braden@USC-ISIA.ARPA
+
+ Remote Telnet Service ------------------------------------ (RTELNET)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 818
+
+ COMMENTS:
+
+ Provides special access to user Telnet on a remote system.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Telnet, Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Graphics Protocol --------------------------------------- (GRAPHICS)
+
+ STATUS: Elective
+
+ SPECIFICATION: NIC 24308 (in APH)
+
+ COMMENTS:
+
+ The protocol for vector graphics.
+
+ Very minor changes needed for use with TCP.
+
+ No known active implementations.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Telnet, Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 20]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Echo Protocol ----------------------------------------------- (ECHO)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 862
+
+ COMMENTS:
+
+ Debugging protocol, sends back whatever you send it.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Discard Protocol ----------------------------------------- (DISCARD)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 863
+
+ COMMENTS:
+
+ Debugging protocol, throws away whatever you send it.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Character Generator Protocol ----------------------------- (CHARGEN)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 864
+
+ COMMENTS:
+
+ Debugging protocol, sends you ASCII data.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+
+
+Reynolds & Postel [Page 21]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Quote of the Day Protocol ---------------------------------- (QUOTE)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 865
+
+ COMMENTS:
+
+ Debugging protocol, sends you a short ASCII message.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Active Users Protocol -------------------------------------- (USERS)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 866
+
+ COMMENTS:
+
+ Lists the currently active users.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Authentication Service -------------------------------------- (AUTH)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 912
+
+ COMMENTS:
+
+ The Authentication Server provides a means to determine the
+ identity of a user of a particular TCP connection. Given a TCP
+ port number pair, it returns a character string which
+ identifies the owner of that connection on the server's system.
+ Suggested uses include automatic identification and
+
+
+Reynolds & Postel [Page 22]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ verification of a user during an FTP session, additional
+ verification of a TAC dial up user, and access verification for
+ a generalized network file server.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: StJohns@MIT-MULTICS.ARPA
+
+ Finger Protocol ------------------------------------------- (FINGER)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 742 (in APH)
+
+ COMMENTS:
+
+ Provides information on the current or most recent activity of
+ a user.
+
+ Some extensions have been suggested.
+
+ Some changes are are needed for TCP.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ WhoIs Protocol ------------------------------------------- (NICNAME)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 812 (in IPTW)
+
+ COMMENTS:
+
+ Accesses the ARPANET Directory database. Provides a way to
+ find out about people, their addresses, phone numbers,
+ organizations, and mailboxes.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+
+
+Reynolds & Postel [Page 23]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ CONTACT: Feinler@SRI-NIC.ARPA
+
+ Domain Name Protocol -------------------------------------- (DOMAIN)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 881, 882, 883
+
+ COMMENTS:
+
+ OTHER REFERENCES:
+
+ RFC 920 - Domain Requirements
+
+ RFC 921 - Domain Name Implementation Schedule - Revised
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+ CONTACT: Mockapetris@USC-ISIF.ARPA
+
+ HOSTNAME Protocol --------------------------------------- (HOSTNAME)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 811 (in IPTW)
+
+ COMMENTS:
+
+ Accesses the Registered Internet Hosts database (HOSTS.TXT).
+ Provides a way to find out about a host in the Internet, its
+ Internet Address, and the protocols it implements.
+
+ OTHER REFERENCES:
+
+ RFC 810 - Host Table Specification
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Feinler@SRI-NIC.ARPA
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 24]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Host Name Server Protocol ----------------------------- (NAMESERVER)
+
+ STATUS: Experimental
+
+ SPECIFICATION: IEN 116 (in IPTW)
+
+ COMMENTS:
+
+ Provides machine oriented procedure for translating a host name
+ to an Internet Address.
+
+ This specification has significant problems: 1) The name
+ syntax is out of date. 2) The protocol details are ambiguous,
+ in particular, the length octet either does or doesn't include
+ itself and the op code. 3) The extensions are not supported by
+ any known implementation.
+
+ This protocol is now abandon in favor of the DOMAIN protocol.
+ Further implementations of this protocol are not advised.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ CSNET Mailbox Name Server Protocol ---------------------- (CSNET-NS)
+
+ STATUS: Experimental
+
+ SPECIFICATION: CS-DN-2
+
+ COMMENTS:
+
+ Provides access to the CSNET data base of users to give
+ information about users names, affiliations, and mailboxes.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Solomon@UWISC.ARPA
+
+
+
+Reynolds & Postel [Page 25]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Daytime Protocol ----------------------------------------- (DAYTIME)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 867
+
+ COMMENTS:
+
+ Provides the day and time in ASCII character string.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Time Server Protocol ---------------------------------------- (TIME)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 868
+
+ COMMENTS:
+
+ Provides the time as the number of seconds from a specified
+ reference time.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+ or User Datagram Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 26]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ DCNET Time Server Protocol --------------------------------- (CLOCK)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 778
+
+ COMMENTS:
+
+ Provides a mechanism for keeping synchronized clocks.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Internet Control Message Protocol
+
+ CONTACT: Mills@USC-ISID.ARPA
+
+ SUPDUP Protocol ------------------------------------------- (SUPDUP)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 734 (in APH)
+
+ COMMENTS:
+
+ A special Telnet like protocol for display terminals.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Crispin@SU-SCORE.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 27]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Internet Message Protocol ------------------------------------ (MPM)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 759
+
+ COMMENTS:
+
+ This is an experimental multimedia mail transfer protocol. The
+ implementation is called a Message Processing Module or MPM.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ RFC 767 - Structured Document Formats
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Post Office Protocol ----------------------------------------- (POP)
+
+ STATUS: Experimental
+
+ SPECIFICATION: RFC 918
+
+ COMMENTS:
+
+ The intent of the Post Office Protocol (POP) is to allow a
+ user's workstation to access mail from a mailbox server. It is
+ expected that mail will be posted from the workstation to the
+ mailbox server via the Simple Mail Transfer Protocol (SMTP).
+ For further information see RFC-821 and RFC-822.
+
+ Please discuss any plans for implementation or use of this
+ protocol with the contact.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES: Transmission Control Protocol
+
+ CONTACT: JKReynolds@USC-ISIF.ARPA
+
+
+
+
+
+
+
+Reynolds & Postel [Page 28]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Network Standard Text Editor ------------------------------- (NETED)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 569
+
+ COMMENTS:
+
+ Describes a simple line editor which could be provided by every
+ Internet host.
+
+ OTHER REFERENCES:
+
+ DEPENDENCIES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 29]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+APPENDICES
+
+ Assigned Numbers ---------------------------------------------------
+
+ STATUS: None
+
+ SPECIFICATION: RFC 923
+
+ COMMENTS:
+
+ Describes the fields of various protocols that are assigned
+ specific values for actual use, and lists the currently
+ assigned values.
+
+ Issued October 1984, replaces RFC 900, RFC 790 in IPTW, and
+ RFC 870.
+
+ OTHER REFERENCES:
+
+ CONTACT: JKReynolds@USC-ISIF.ARPA
+
+ Pre-emption --------------------------------------------------------
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 794 (in IPTW)
+
+ COMMENTS:
+
+ Describes how to do pre-emption of TCP connections.
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 30]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Service Mappings ---------------------------------------------------
+
+ STATUS: None
+
+ SPECIFICATION: RFC 795 (in IPTW)
+
+ COMMENTS:
+
+ Describes the mapping of the IP type of service field onto the
+ parameters of some specific networks.
+
+ Out of date, needs revision.
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Address Mappings ---------------------------------------------------
+
+ STATUS: None
+
+ SPECIFICATION: RFC 796 (in IPTW)
+
+ COMMENTS:
+
+ Describes the mapping between Internet Addresses and the
+ addresses of some specific networks.
+
+ Out of date, needs revision.
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Document Formats ---------------------------------------------------
+
+ STATUS: None
+
+ SPECIFICATION: RFC 678
+
+ COMMENTS:
+
+ Describes standard format rules for several types of documents.
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+Reynolds & Postel [Page 31]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Bitmap Formats -----------------------------------------------------
+
+ STATUS: None
+
+ SPECIFICATION: RFC 797
+
+ COMMENTS:
+
+ Describes a standard format for bitmap data.
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Facsimile Formats --------------------------------------------------
+
+ STATUS: None
+
+ SPECIFICATION: RFC 804
+
+ COMMENTS:
+
+ Describes a standard format for facsimile data.
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Internet Protocol on X.25 Networks ---------------------------------
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 877
+
+ COMMENTS:
+
+ Describes a standard for the transmission of IP Datagrams over
+ Public Data Networks.
+
+ OTHER REFERENCES:
+
+ CONTACT: jtk@PURDUE.ARPA
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 32]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Internet Protocol on DC Networks -----------------------------------
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 891
+
+ COMMENTS:
+
+ OTHER REFERENCES:
+
+ RFC 778 - DCNET Internet Clock Service
+
+ CONTACT: Mills@USC-ISID.ARPA
+
+ Internet Protocol on Ethernet Networks -----------------------------
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 894
+
+ COMMENTS:
+
+ OTHER REFERENCES: RFC 893
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ Internet Protocol on Experimental Ethernet Networks ----------------
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 895
+
+ COMMENTS:
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 33]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ Address Resolution Protocol ---------------------------------- (ARP)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 826
+
+ COMMENTS:
+
+ This is a procedure for finding the network hardware address
+ corresponding to an Internet Address.
+
+ OTHER REFERENCES:
+
+ CONTACT: Postel@USC-ISIF.ARPA
+
+ A Reverse Address Resolution Protocol ----------------------- (RARP)
+
+ STATUS: Elective
+
+ SPECIFICATION: RFC 903
+
+ COMMENTS:
+
+ This is a procedure for workstations to dynamically find their
+ protocol address (e.g., their Internet Address), when they only
+ only know their hardware address (e.g., their attached physical
+ network address).
+
+ OTHER REFERENCES:
+
+ CONTACT: Mogul@SU-SCORE.ARPA
+
+ Host Access Protocol ----------------------------------------- (HAP)
+
+ STATUS: Recommended
+
+ SPECIFICATION: RFC 907
+
+ COMMENTS:
+
+ This protocol specifies the network-access level communication
+ between an arbitrary computer, called a host, and a
+ packet-switched satellite network, e.g., SATNET or WBNET.
+
+ Note: Implementations of HAP should be performed in
+ coordination with satellite network development and operations
+ personnel.
+
+ OTHER REFERENCES:
+
+
+Reynolds & Postel [Page 34]
+
+
+
+Official ARPA-Internet Protocols RFC 924
+
+
+ DEPENDENCIES:
+
+ CONTACT: Schoen@BBN-UNIX.ARPA
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Reynolds & Postel [Page 35]
+