Message Send Protocol
The Message Send Protocol (MSP) is an application layer protocol used to send a short message between nodes on a network. The original version of the protocol was published in 1990.[1] It was updated as Message Send Protocol 2 in 1992.[2]
TCP-based service
One message send service is defined as a connection-based application on TCP. A service listens for TCP connections on port 18. Once a connection is established, a short message is transmitted from the sender to the receiver over the connection. The sender closes the connection after sending the message.
UDP-based service
Another message send service is defined as a datagram-based application on UDP. A service listens for UDP datagrams on port 18. When a datagram is received by the receiver, an answering datagram is sent back to the sender containing exactly the same data.
See also
- LAN Messenger
- List of TCP and UDP port numbers
- SMTP
References
- ↑ Nelson, Russell (June 1990), Message Send Protocol, IETF, doi:10.17487/RFC1159, RFC 1159, https://tools.ietf.org/html/rfc1159
- ↑ Nelson, Russell; Arnold, Geoff (April 1992), Message Send Protocol 2, IETF, doi:10.17487/RFC1312, RFC 1312, https://tools.ietf.org/html/rfc1312
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