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-
-
- Network Working Group J. Postel
- Request for Comments: 861 J. Reynolds
- ISI
- Obsoletes: NIC 16239 May 1983
-
- TELNET EXTENDED OPTIONS - LIST 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
-
- EXTENDED-OPTIONS-LIST (EXOPL) 255
-
- 2. Command Meanings
-
- IAC DO EXOPL
-
- The sender of this command REQUESTS that the receiver of this
- command begin negotiating, or confirms that the receiver of this
- command is expected to begin negotiating, TELNET options which are
- on the "Extended Options List".
-
- IAC WILL EXOPL
-
- The sender of this command requests permission to begin
- negotiating, or confirms that it will begin negotiating, TELNET
- options which are on the "Extended Options List".
-
- IAC WON'T EXOPL
-
- The sender of this command REFUSES to negotiate, or to continue
- negotiating, options on the "Extended Options List".
-
- IAC DON'T EXOPL
-
- The sender of this command DEMANDS that the receiver conduct no
- further negotiation of options on the "Extended Options List".
-
- IAC SB EXOPL <subcommand>
-
- The subcommand contains information required for the negotiation
- of an option of the "Extended Options List". The format of the
- subcommand is discussed in section 5 below.
-
- 3. Default
-
- WON'T EXOPL, DON'T EXOPL
-
-
-
-
- Postel & Reynolds [Page 1]
-
-
-
- RFC 861 May 1983
-
-
- Negotiation of options on the "Extended Options List" is not
- permitted.
-
-
- 4. Motivation for the Option
-
- Eventually, a 257th TELNET option will be needed. This option will
- extend the option list for another 256 options in a manner which is
- easy to implement. The option is proposed now, rather than later
- (probably much later), in order to reserve the option number (255).
-
- 5. An Abstract Description of the Option
-
- The EXOPL option has five subcommand codes: WILL, WON'T, DO, DON'T,
- and SB. They have exactly the same meanings as the TELNET commands
- with the same names, and are used in exactly the same way. For
- consistency, these subcommand codes will have the same values as the
- TELNET command codes (250-254). Thus, the format for negotiating a
- specific option on the "Extended Options List" (once both parties
- have agreed to use it) is:
-
- IAC SB EXOPL DO/DON'T/WILL/WON'T/<option code> IAC SE
-
- Once both sides have agreed to use the specific option specified by
- <option code>, subnegotiation may be required. In this case the
- format to be used is:
-
- IAC SB EXOPL SB <option code> <parameters> SE IAC SE
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- Postel & Reynolds [Page 2]
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