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Network Working Group                                          J. PostelRequest for Comments: 858                                    J. Reynolds                                                                     ISIObsoletes: NIC 15392                                            May 1983TELNET SUPPRESS GO AHEAD OPTIONThis RFC specifies a standard for the ARPA Internet community.  Hosts onthe ARPA Internet are expected to adopt and implement this standard.1.  Command Name and Code   SUPPRESS-GO-AHEAD     32.  Command Meanings   IAC WILL SUPPRESS-GO-AHEAD      The sender of this command requests permission to begin      suppressing transmission of the TELNET GO AHEAD (GA) character      when transmitting data characters, or the sender of this command      confirms it will now begin suppressing transmission of GAs with      transmitted data characters.   IAC WON'T SUPPRESS-GO-AHEAD      The sender of this command demands to begin transmitting, or to      continue transmitting, the GA character when transmitting data      characters.   IAC DO SUPPRESS-GO-AHEAD      The sender of this commannd requests that the sender of data start      suppressing GA when transmitting data, or the sender of this      command confirms that the sender of data is expected to suppress      transmission of GAs.   IAC DON'T SUPPRESSS-GO-AHEAD      The sender of this command demands that the receiver of the      command start or continue transmitting GAs when transmitting data.3.  Default   WON'T SUPPRESS-GO-AHEAD   DON'T SUPPRESS-GO-AHEAD      Go aheads are transmitted.Postel & Reynolds                                               [Page 1]

RFC 858                                                         May 19834. Motivation for the Option   While the NVT nominally follows a half duplex protocol complete with   a GO AHEAD signal, there is no reason why a full duplex connection   between a full duplex terminal and a host optimized to handle full   duplex terminals should be burdened with the GO AHEAD signal.   Therefore, it is desirable to have a TELNET option with which parties   involved can agree that one or the other or both should suppress   transmission of GO AHEADS.5.  Description of the Option   When the SUPPRESS-GO-AHEAD option is in effect on the connection   between a sender of data and the receiver of the data, the sender   need not transmit GAs.   It seems probable that the parties to the TELNET connection will   suppress GO AHEAD in both directions of the TELNET connection if GO   AHEAD is suppressed at all;  but, nonetheless, it must be suppressed   in both directions independently.   With the SUPPRESS-GO-AHEAD option in effect, the IAC GA command   should be treated as a NOP if received, although IAC GA should not   normally be sent in this mode.6.  Implementation Considerations   As the SUPRESS-GO-AHEAD option is sort of the opposite of a line at a   time mode, the sender of data which is suppressing GO AHEADs should   attempt to actually transmit characters as soon as possible (i.e.,   with minimal buffering) consistent with any other agreements which   are in effect.   In many TELNET implementations it will be desirable to couple the   SUPPRESS-GO-AHEAD option to the echo option so that when the echo   option is in effect, the SUPPRESS-GO-AHEAD option is in effect   simultaneously:  both of these options will normally have to be in   effect simultaneously to effect what is commonly understood to be   character at a time echoing by the remote computer.Postel & Reynolds                                               [Page 2]

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