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Network Working Group Request for Comments: 861 Obsoletes: NIC 16239 TELNET EXTENDED OPTIONS - LIST OPTION

J. Postel J. Reynolds ISI May 1983

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) 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 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 255

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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 extend the option list for another easy to implement. The option is (probably much later), in order to will be needed. This option will 256 options in a manner which is proposed now, rather than later 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/ IAC SE Once both sides have agreed to use the specific option specified by , subnegotiation may be required. In this case the format to be used is: IAC SB EXOPL SB SE IAC SE

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