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diff --git a/doc/rfc/rfc858.txt b/doc/rfc/rfc858.txt new file mode 100644 index 0000000..48ef49c --- /dev/null +++ b/doc/rfc/rfc858.txt @@ -0,0 +1,113 @@ + +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. + + + +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. + + + + + + + + + + + +Postel & Reynolds [Page 2] + |