RFC 857 (rfc857) - Page 1 of 5

Telnet Echo Option

Alternative Format: Original Text Document
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Network Working Group                                          J. Postel
Request for Comments: 857                                    J. Reynolds
                                                                     ISI
Obsoletes: NIC 15390                                            May 1983

                           TELNET ECHO OPTION


This RFC specifies a standard for the ARPA Internet community.  Hosts on
the ARPA Internet are expected to adopt and implement this standard.

1. Command Name and Code

   ECHO       1

2. Command Meanings

   IAC WILL ECHO

      The sender of this command REQUESTS to begin, or confirms that it
      will now begin, echoing data characters it receives over the
      TELNET connection back to the sender of the data characters.

   IAC WON'T ECHO

      The sender of this command DEMANDS to stop, or refuses to start,
      echoing the data characters it receives over the TELNET connection
      back to the sender of the data characters.

   IAC DO ECHO

      The sender of this command REQUESTS that the receiver of this
      command begin echoing, or confirms that the receiver of this
      command is expected to echo, data characters it receives over the
      TELNET connection back to the sender.

   IAC DON'T ECHO

      The sender of this command DEMANDS the receiver of this command
      stop, or not start, echoing data characters it receives over the
      TELNET connection.

3. Default

   WON'T ECHO

   DON'T ECHO

      No echoing is done over the TELNET connection.

4. Motivation for the Option


Postel & Reynolds
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