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E-mail: Ouyang@china-pub.com
Translator: Gu Guofei (GGFEI GGFEI@263.net)
Translation time: 2001-4-2
Copyright: This Chinese translation copyright belongs to China Interactive Publishing Network. Can be used for non-commercial use free reprint, but the translation and copyright information of this document must be retained.
Network Working Group J. Postel
Request for Comments: 858 J. Reynolds
ISI
Obsoletes: NIC 15392 May 1983
RFC 858 Telnet Suppress Go Ahead Options
(RFC 858 Telnet Suppress Go Ahead Option)
This RFC specifies the standards on ARPA Internet Community. All hosts on the ARPA Internet should adopt and implement this standard.
table of Contents
Command and code 1
2. Command meaning 2
3. Default 2
4. The reason for the option 2
5. Other cases of this option 2
6. Implement 2
Command and code
Suppress-go-ahead 3
2. Command meaning
* IAC WILL Suppress-Go-ahead
The command issuer requests to allow the Telnet Go Ahead (GA) characters to prohibit transmission when data transmission is performed, or this transmission will begin.
* IAC Won't support-go-ahead
The command issuer requires to start transmitting the GA character or continue to transfer the transfer ga character.
* IAC do support-go-ahead
Command sender requesting the data sender to start prohibiting GA, or confirming that the data sender is performing a Ban transmission of GA.
* Iac Don't Suppresses-go-ahead
The command issuer requires the recipient to start or continue to transmit the GA.
3. Default
Won't supportress-go-ahead and don't support-go-ahead is the default.
4. The reason for the option
NVT If the end of Go Ahead is ended, it is a half-duplex protocol, which is not necessary to make a full-duplex connection to handle what changes to the Go Ahead signal, which is meaningful. Therefore, it is necessary to introduce a Telnet option to allow both parties to prohibit transmission of Go Ahead.
5. Other situations of this option
When support-go-ahead takes effect, the data reception and the sender does not have to transmit GA.
It seems that only the GA is prohibited in the full-duplex transmission, but in fact, GA must be prohibited in both directions.
When the Suppress-Go-ahead takes effect, the IAC GA command will be considered as a NOP command.
6. Implement
Because Supress-Go-ahead is opposite to the Line-AT-A-Time mode, the data sender should transfer data as soon as possible.
In many Telnet implementations, use the supress-go-ahead and echo options simultaneously. When the Echo takes effect, Supress-Go-Ahead takes effect at the same time, and this is also worth noting.
RFC858 Telnet Suppress Go Ahead Option RFC858 Telnet Suppress Go Ahead Option 1
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RFC Document Chinese Translation Program
