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PROPOSED STANDARD

NWG/RFC# 736                                  MRC 31-OCT-77 23:28  42213Telnet SUPDUP OptionNetwork Working Group                                       Mark CrispinRequest for Comments 736                                           SU-AINIC 42213                                                31 October 1977TELNET SUPDUP Option1.  Command name and code.   SUPDUP               212.  Command meanings.   IAC WILL SUPDUP      The sender of this command  REQUESTS permission to, or  confirms      that it will, use the SUPDUP display protocol   IAC WON'T SUPDUP      The sender of this command REFUSES to use the SUPDUP protocol.   IAC DO SUPDUP      The sender of this  command REQUESTS that  the receiver use,  or      grants the receiver permission to use, the SUPDUP protocol.   IAC DON'T      The sender of this command DEMANDS that the receiver not use the      SUPDUP protocol.3.  Default.   WON'T SUPDUP   DON'T SUPDUP   i.e., the SUPDUP display protocol is not in use.Mark Crispin                                                       [page 1]

NWG/RFC# 736                                  MRC 31-OCT-77 23:28  42213Telnet SUPDUP Option4.  Motivation for the option.   Since the publication ofRFC 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.5.  Description of the option.   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.   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.   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.   Following the mutual  acceptance of the  SUPDUP option, the  SUPDUP   negotiation proceeds as described inRFC 734.Mark Crispin                                                       [page 2]

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