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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.
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- 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.
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- TCP Based Echo Service
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- 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.
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- UDP Based Echo Service
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- 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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