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Message Send Protocol
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<h2 id="tcp-based-service">TCP-based service</h2> <p>One message send <a href="/facts/Service_(systems_architecture)/LTBXD49s">service</a> is defined as a connection-based application on <a href="/facts/Transmission_Control_Protocol/WW4sPrt9">TCP</a>. A service listens for TCP connections on <a href="/facts/Port_(computer_networking)/ygoHVKNC">port</a> 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. </p> <h2 id="udp-based-service">UDP-based service</h2> <p>Another message send service is defined as a <a href="/facts/Datagram/TMHVctMz">datagram</a>-based application on <a href="/facts/User_Datagram_Protocol/dxLU0D6q">UDP</a>. 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. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/LAN_Messenger/WMYTt0g8">LAN Messenger</a></li> <li><a href="/facts/List_of_TCP_and_UDP_port_numbers/c30Xg4d4">List of TCP and UDP port numbers</a></li> <li><a href="/facts/SMTP/TeCRKDpJ">SMTP</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Nelson, Russell (June 1990). Message Send Protocol. IETF. doi:10.17487/RFC1159. RFC 1159. <a href="https://datatracker.ietf.org/doc/html/rfc1159" target="_blank">https://datatracker.ietf.org/doc/html/rfc1159</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Nelson, Russell; Arnold, Geoff (April 1992). Message Send Protocol 2. IETF. doi:10.17487/RFC1312. RFC 1312. <a href="https://datatracker.ietf.org/doc/html/rfc1312" target="_blank">https://datatracker.ietf.org/doc/html/rfc1312</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>