Network Working Group J. Postel
Request for Comments: 863
This RFC specifies a standard for the ARPA Internet community. Hosts on
the ARPA Internet that choose to implement a Discard Protocol are
expected to adopt and implement this standard.
A useful debugging and measurement tool is a discard service. A discard
service 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
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.