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- NWG/RFC# 736 MRC 31-OCT-77 23:28 42213
- Telnet SUPDUP Option
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- Network Working Group Mark Crispin
- Request for Comments 736 SU-AI
- NIC 42213 31 October 1977
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- TELNET SUPDUP Option
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- 1. Command name and code.
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- SUPDUP 21
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- 2. Command meanings.
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- IAC WILL SUPDUP
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- The sender of this command REQUESTS permission to, or confirms
- that it will, use the SUPDUP display protocol
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- IAC WON'T SUPDUP
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- The sender of this command REFUSES to use the SUPDUP protocol.
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- IAC DO SUPDUP
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- The sender of this command REQUESTS that the receiver use, or
- grants the receiver permission to use, the SUPDUP protocol.
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- IAC DON'T
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- The sender of this command DEMANDS that the receiver not use the
- SUPDUP protocol.
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- 3. Default.
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- WON'T SUPDUP
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- DON'T SUPDUP
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- i.e., the SUPDUP display protocol is not in use.
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- Mark Crispin [page 1]
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- NWG/RFC# 736 MRC 31-OCT-77 23:28 42213
- Telnet SUPDUP Option
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-
- 4. Motivation for the option.
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- Since the publication of RFC 734, I have been requested to design
- an option to the TELNET protocol to provide for SUPDUP service.
- This option allows a host to provide SUPDUP service on the normal
- TELNET socket (27 octal) instead of 137 (octal) which is the normal
- SUPDUP ICP socket.
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- 5. Description of the option.
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- A user TELNET program which wishes to use the SUPDUP display
- protocol instead of the NVT terminal service should send an IAC DO
- SUPDUP. If the server is willing to use the SUPDUP display
- protocol, it should respond with IAC WILL SUPDUP; otherwise it
- should refuse with IAC WONT SUPDUP.
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- For hosts which normally provide SUPDUP terminal services, the
- server can send IAC WILL SUPDUP upon ICP which the user may then
- accept or refuse.
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- If the SUPDUP option is in effect, no further TELNET negotiations
- are allowed. They are meaningless, since SUPDUP has its own
- facilities to perform the functions that are needed. Hence, octal
- 377 will become an ordinary transmitted character (in this case an
- invalid %TD code) instead of an IAC.
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- Following the mutual acceptance of the SUPDUP option, the SUPDUP
- negotiation proceeds as described in RFC 734.
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- Mark Crispin [page 2]
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