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Amiga Collections: Amiga Amateur Radio User Group
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AARUG UK #81 (199x)(Amiga Amateur Radio User Group UK)(PD)[WB][G4DCV].zip
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AARUG UK #81 (199x)(Amiga Amateur Radio User Group UK)(PD)[WB][G4DCV].adf
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DisView
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ECHO
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1995-05-21
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==== DISview [518]
echo
====
_________________________________________________________________
echo [accept|refuse] Default: accept
_________________________________________________________________
Display or set the flag controlling client Telnet's response to a
remote WILL ECHO offer.
The Telnet presentation protocol specifies that in the absence of
a negotiated agreement to the contrary, neither end echoes data
received from the other. In this mode, a Telnet client session
echoes keyboard input locally and nothing is actually sent until
ENTER is typed.
Local line editing is also performed: backspace deletes the last
character typed, while control-U deletes the entire line.
When communicating from keyboard to keyboard the standard local
echo mode is used, so the setting of this parameter has no
effect. However, many timesharing systems (e.g. UNIX) prefer to
do their own echoing of typed input. (This makes screen editors
work right, among other things). Such systems send a Telnet WILL
ECHO offer immediately upon receiving an incoming Telnet
connection request.
If 'echo accept' is in effect, a client Telnet session will
automatically return a DO ECHO response. In this mode, local
echoing and editing is turned off and each key stroke is sent
immediately (subject to the Nagle tinygram algorithm in TCP).
While this mode is just fine across an Ethernet, it is clearly
inefficient and painful across slow dial-up links. Specifying
'echo refuse' causes an incoming WILL ECHO offer to be answered
with a DONT ECHO; the client Telnet session remains in the local
echo mode. Sessions already in the remote echo mode are
unaffected. (Note: Berkeley Unix has a bug in that it will still
echo input even after the client has refused the WILL ECHO
offer. To get around this problem, enter the 'stty - echo'
command to the shell once you have logged in).
>> Example: echo accept