122 lines
3.3 KiB
Plaintext
122 lines
3.3 KiB
Plaintext
<html><head><TITLE>RFC 861</TITLE>
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<a href="../index.html"><img src="../rfcicon.gif" border=0 align=right></a>
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<H1>RFC 861</H1>
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<p><HR>
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<pre>
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Network Working Group J. Postel
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Request for Comments: 861 J. Reynolds
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ISI
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Obsoletes: NIC 16239 May 1983
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TELNET EXTENDED OPTIONS - LIST OPTION
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This RFC specifies a standard for the ARPA Internet community. Hosts on
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the ARPA Internet are expected to adopt and implement this standard.
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1. Command Name and Code
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EXTENDED-OPTIONS-LIST (EXOPL) 255
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2. Command Meanings
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IAC DO EXOPL
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The sender of this command REQUESTS that the receiver of this
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command begin negotiating, or confirms that the receiver of this
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command is expected to begin negotiating, TELNET options which are
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on the "Extended Options List".
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IAC WILL EXOPL
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The sender of this command requests permission to begin
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negotiating, or confirms that it will begin negotiating, TELNET
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options which are on the "Extended Options List".
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IAC WON'T EXOPL
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The sender of this command REFUSES to negotiate, or to continue
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negotiating, options on the "Extended Options List".
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IAC DON'T EXOPL
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The sender of this command DEMANDS that the receiver conduct no
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further negotiation of options on the "Extended Options List".
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IAC SB EXOPL <subcommand>
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The subcommand contains information required for the negotiation
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of an option of the "Extended Options List". The format of the
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subcommand is discussed in section 5 below.
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3. Default
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WON'T EXOPL, DON'T EXOPL
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Postel & Reynolds [Page 1]
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<hr>
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<a href="./rfc861.html">RFC 861</a> May 1983
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Negotiation of options on the "Extended Options List" is not
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permitted.
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4. Motivation for the Option
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Eventually, a 257th TELNET option will be needed. This option will
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extend the option list for another 256 options in a manner which is
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easy to implement. The option is proposed now, rather than later
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(probably much later), in order to reserve the option number (255).
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5. An Abstract Description of the Option
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The EXOPL option has five subcommand codes: WILL, WON'T, DO, DON'T,
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and SB. They have exactly the same meanings as the TELNET commands
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with the same names, and are used in exactly the same way. For
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consistency, these subcommand codes will have the same values as the
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TELNET command codes (250-254). Thus, the format for negotiating a
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specific option on the "Extended Options List" (once both parties
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have agreed to use it) is:
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IAC SB EXOPL DO/DON'T/WILL/WON'T/<option code> IAC SE
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Once both sides have agreed to use the specific option specified by
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<option code>, subnegotiation may be required. In this case the
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format to be used is:
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IAC SB EXOPL SB <option code> <parameters> SE IAC SE
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Postel & Reynolds [Page 2]
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<hr>
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</pre>
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