Network Working Group                                        J. Reynolds
Request for Comments: 901                                      J. Postel
                                                                     ISI
Obsoletes: RFCs  880, 840                                      June 1984
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OFFICIAL ARPA-INTERNET PROTOCOLS

Status of this Memo

This memo is an official status report on the protocols used in the ARPA-Internet community.

Introduction

This RFC identifies the documents specifying the official protocols used in the Internet. Annotations identify 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 option protocols were issued by the NIC in a booklet entitled "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.


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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


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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

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.


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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

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.

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:

DEPENDENCIES: Internet Protocol

CONTACT: Postel@USC-ISIF.ARPA


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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.

Listening Servers: Several comments have been received on difficulties with contacting listening servers. There should be some discussion of implementation issues for servers, and


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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 Segement 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

RFC 817 (in IPIG) - Modularity and Efficiency in Protocol Implementation


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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


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DEPENDENCIES: Internet Protocol

CONTACT: Postel@USC-ISIF.ARPA

"Stub" Exterior Gateway Protocol -----------------------------------

STATUS: Recommended for Gateways

SPECIFICATION: RFC 888

COMMENTS:

The gateway protocol now under development.

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


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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


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Network Voice Protocol (NVP-II) ------------------------------------

STATUS: Experimental

SPECIFICATION: RFC xxx

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:

DEPENDENCIES: Internet Protocol, Stream Protocol

CONTACT: Casner@USC-ISIB.ARPA

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


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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


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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


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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.

LIST and NLST:


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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.

No known problems with this specification. This is in use in several local networks.

OTHER REFERENCES:

DEPENDENCIES: User Datagram Protocol

CONTACT: Postel@USC-ISIF.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.


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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.

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


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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:

DEPENDENCIES: Transmission Control Protocol

CONTACT: Braden@USC-ISIA.ARPA


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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


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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


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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

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.


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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

CONTACT: Feinler@SRI-NIC.ARPA

Domain Name Protocol (DOMAIN)

STATUS: Experimental

SPECIFICATION: RFC 881, 882, 883

COMMENTS:

OTHER REFERENCES:

RFC 897 - Domain Name Implementation Schedule

DEPENDENCIES: Transmission Control Protocol

CONTACT: Mockapetris@USC-ISIF.ARPA


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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

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.

Work is in progress on a significant revision. 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


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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

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:


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DEPENDENCIES: Transmission Control Protocol
or User Datagram Protocol

CONTACT: Postel@USC-ISIF.ARPA

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: Admin.MRC@SU-SCORE.ARPA


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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 xxx

COMMENTS:

This is an experimental procedure for accessing mailbox services from personal workstations.

Please discuss any plans for implementation or use of this protocol with the contact.

OTHER REFERENCES:

DEPENDENCIES: Transmission Control Protocol

CONTACT: Postel@USC-ISIF.ARPA


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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

Appendices

Assigned Numbers ---------------------------------------------------

STATUS: None

SPECIFICATION: RFC 900

COMMENTS:

Describes the fields of various protocols that are assigned specific values for actual use, and lists the currently assigned values.

Issued June 1984, replaces RFC 870, RFC 790 in IPTW, and RFC 820 of January 1983.

OTHER REFERENCES:

CONTACT: JKReynolds@USC-ISIF.ARPA


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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

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


Page 27

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

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


Page 28

Internet Protocol on Experimental Ethernet Networks ----------------

STATUS: Recommended

SPECIFICATION: RFC 895

COMMENTS:

OTHER REFERENCES:

CONTACT: Postel@USC-ISIF.ARPA

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