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-
- Network Working Group J. Postel
- Request for Comments: 858 J. Reynolds
- ISI
- Obsoletes: NIC 15392 May 1983
-
- TELNET SUPPRESS GO AHEAD 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
-
- SUPPRESS-GO-AHEAD 3
-
- 2. 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.
-
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- Postel & Reynolds [Page 1]
-
-
-
- RFC 858 May 1983
-
-
- 4. 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.
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- Postel & Reynolds [Page 2]
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