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IETF RFC 924
Official ARPA-Internet protocols for connecting personal computers to the Internet
Last modified on Tuesday, September 22nd, 1992
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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.
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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
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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
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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).
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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
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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
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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
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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
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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
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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
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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
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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
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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.
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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
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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.
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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
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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:
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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
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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
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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
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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
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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
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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
Official ARPA-Internet protocols for connecting personal computers to the Internet
RFC TOTAL SIZE: 48513 bytes
PUBLICATION DATE: Tuesday, September 22nd, 1992
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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