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+Network Working Group                                          J. Postel
+Request for Comments: 862                                            ISI
+                                                                May 1983
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+                             Echo Protocol
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+This RFC specifies a standard for the ARPA Internet community.  Hosts on
+the ARPA Internet that choose to implement an Echo Protocol are expected
+to adopt and implement this standard.
+
+A very useful debugging and measurement tool is an echo service.  An
+echo service simply sends back to the originating source any data it
+receives.
+
+TCP Based Echo Service
+
+   One echo service is defined as a connection based application on TCP.
+   A server listens for TCP connections on TCP port 7.  Once a
+   connection is established any data received is sent back.  This
+   continues until the calling user terminates the connection.
+
+UDP Based Echo Service
+
+   Another echo service is defined as a datagram based application on
+   UDP.  A server listens for UDP datagrams on UDP port 7.  When a
+   datagram is received, the data from it is sent back in an answering
+   datagram.
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+Postel                                                          [Page 1]
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