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Network Working Group                                          J. PostelRequest for Comments: 863                                            ISI                                                                May 1983Discard ProtocolThis RFC specifies a standard for the ARPA Internet community.  Hosts onthe ARPA Internet that choose to implement a Discard Protocol areexpected to adopt and implement this standard.A useful debugging and measurement tool is a discard service.  A discardservice simply throws away any data it receives.TCP Based Discard Service   One discard service is defined as a connection based application on   TCP.  A server listens for TCP connections on TCP port 9.  Once a   connection is established any data received is thrown away.  No   response is sent.  This continues until the calling user terminates   the connection.UDP Based Discard Service   Another discard service is defined as a datagram based application on   UDP.  A server listens for UDP datagrams on UDP port 9.  When a   datagram is received, it is thrown away.  No response is sent.Postel                                                          [Page 1]