Message Send Protocol (RFC1159)
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2019-Feb-11
Internet Society Requests For Comment (RFCs)
This RFC suggests an Experimental Protocol for the Internet community. Hosts on the Internet that choose to implement a Message Send Protocol may experiment with this protocol.
Network Working Group R. Nelson Request for Comments: 1159 Clarkson University June 1990
Message Send Protocol
Status of this Memo
This RFC suggests an Experimental Protocol for the Internet community. Hosts on the Internet that choose to implement a Message Send Protocol may experiment with this protocol. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited.
The Message Send Protocol is used to send a short message to a given user on a given terminal on a given host. This is similar to the service provided by Unix’s write command, which is limited to the users on that host. This service is also known on some hosts as "SEND".
As the Internet grows, more and more people are using hosts that do not run TCP/IP at all times. These hosts may be able to use a simple protocol that can be implemented in a subset of TCP/IP. The Message Send Protocol is one such protocol.
Note that a message sending protocol is already defined using TCP. The SMTP protocol includes a "SEND" command that will direct mail to a user’s terminal. SMTP’s SEND is not useful in this instance because TCP requires quite a bit of code. For the purposes of standardization, we will include a TCP based Message Send Service.
TCP Based Message Send Service
One message send service is defined as a connection based application on TCP. A server listens for TCP connections on TCP port 18. Once a connection is established a short message is sent by the client out the connection (and any data received by the client is thrown away). The client closes the connection after sending the message.
UDP Based Message Send Service
Another message send service is defined as a datagram based application on UDP. A server listens for UDP datagrams on UDP port 18. When a datagram is received by the server, an answering datagram
Nelson [Page 1]
RFC 1159 Message Send Protocol June 1990
is sent back to th...