RFC 123 (rfc123) - Page 1 of 3

Proffered Official ICP

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Network Working Group                                         S. Crocker
Request for Comments: 123                                           UCLA
NIC #5837                                                    20 April 71
Categories: D.1
Obsoletes: RFCs 66, 80
Updates: RFCs 98, 101


                        A Proferred Official ICP

By Initial Connection Protocol (ICP), I mean a third level protocol
which is initiated by a user process at one site in order to contact a
server process at another site.  Typically, the user process will be a
Telnet and the server process will be a logger, but there may be other
cases.

In this RFC, I wish to describe a family of ICPs suitable for
establishing one pair of connections (one in each direction) between any
user process and any server process, and to propose further a particular
subset of this family as the standard ICP for connecting user processes
to loggers on systems which accept teletype-like devices.

Notation

We have no standard notation for describing system calls which initiate
and close connections or cause data to be sent, so I will use the
following ad hoc notation.

Init (local = l, foreign = f, size = s)

   causes the local Host to attempt to establish a connection between
   socket l at the local Host and socket f, with a byte size of s for
   the connection.

   l is a 32 bit local socket number,
   f is a 40 bit foreign socket number, the high-order eight bits
   of which specify the foreign Host, and
   s is an eight bit non-zero byte size.
   The sum of l and f must be odd.

Listen (local = l, size = s)

   causes the local Host to wait for a request for connection to local
   socket l with byte size s.  The process will be woken when a
   connection is established.  The parameters l and s are the same as
   for Init.
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