Telnet X.3 PAD option (RFC1053)
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2000-Sep-12
Internet Society Requests For Comment (RFCs)
S. Levy: AUTHOR [+2]
Status of this Memo
Network Working Group S. Levy
Request for Comments: 1053 T. Jacobson
Minnesota Supercomputer Center
Telnet X.3 PAD Option
Status of this Memo
This RFC proposes a new option to Telnet for the Internet community,
and requests discussion and suggestions for improvements.
Distribution of this memo is unlimited.
1. Command name and code
2. Command meanings
IAC DO X.3-PAD
The issuing telnet requests that its peer perform X.3-PAD
functions, or accepts an offer to do so.
IAC DON'T X.3-PAD
The issuing telnet demands that its peer not perform or cease
performing X.3-PAD functions.
IAC WILL X.3-PAD
The issuing telnet offers to perform X.3-PAD functions or confirms
that it will do so.
IAC WON'T X.3-PAD
The issuing telnet refuses to perform X.3-PAD functions or
indicates that it is ceasing to handle them.
Typically a server (host) telnet will use DO and DON'T, while a
client (user) telnet will use WILL and WON'T. For convenience, in
the rest of this RFC 'host' and 'user' telnets refer to those saying
'DO X.3-PAD' or 'WILL X.3-PAD' respectively.
Both telnet peers may use this option without confusion, as all
messages unambiguously identify whether they come from the host
("DO") or the user ("WILL") side.
Once DO and WILL have been exchanged, the host ("DO") telnet may
send the following messages:
IAC SB X.3-PAD SET
IAC SB X.3-PAD RESPONSE-SET
IAC SB X.3-PAD SEND IAC SE
while the user ("WILL") telnet may send the following messages:
IAC SB X.3-PAD IS
IAC SB X.3-PAD RESPONSE-IS
The code for SET is 0
The code for RESPONSE-SET is 1
The code for IS is 2
The code for RESPONSE-IS is 3
The code for SEND is 4
Messages listing parameter-value pairs may contain any number of
such pairs, including zero. Each parameter and each value
occupies one octet, except that 255 (IAC) is doubled wherever it
3. Default conditions
The initial state is DON'T X.3-PAD, WON'T X.3-PAD. This RFC does not
specify default values for most X.3 parameters. If the host telnet
wishes a particular initial state (as it normally will), it should
negotiate for it after exchange of DO/WILL messages.
X.3-PAD parameter values need not be preserved except when DO/WILL
X.3-PAD is in effect. Thus if a host enables ("DO") X.3-PAD,
negotiates about some parameters, then for some reason disables
("DONT") and later re-enables X.3-PAD, it must renegotiate any
parameters it cares about.
Keeping in mind that the host telnet m...