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From: dpm@cs.purdue.edu (David Moffett)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Telnetd bug or mis-feature?
Date: 29 Jul 1995 23:38:19 -0500
Organization: Department of Computer Science, Purdue University
Lines: 34
Distribution: world
Message-ID: <3vf2br$3di@ector.cs.purdue.edu>
NNTP-Posting-Host: ector.cs.purdue.edu
Summary: duplex/echoing confusion perhaps?
Keywords: telnet, telnetd, duplex, echoing
Sometime ago, there was a question about telneting INTO a FreeBSD box
yielding confused results. I didn't pay attention or my site's news
spool splatted because I don't remember seeing an answer.
Symptoms:
* telnet always connects
* the negotiated duplex/echo is usually confused.
- Sometimes the FreeBSD box thinks that it needs to echo each line after
return is pressed.
- Sometimes the connection works OK.
- Sometimes the connection is negotiated such that the FreeBSD box
thinks there is a half duplex/local echo connection, and thus
no one echos the keystrokes.
- text originally generated on the FreeBSD side is always correct.
* ftp from the same DOS box works just fine.
I just installed FreeBSD 2.0.5R from CDROM. Previously I was running
2.0.0R. Problem is true on both O/Ses. The caller is NCSA telnet for
DOS which can be fetched from their ftp site.
I wandered into the telnetd sources (in 2.0.0R) and there is some
discussion of a previous BSD bug in telnetd causing such a problem.
Ditto for the 'bugs' section of the man page.
Could someone enlighten me and perhaps add to the FAQ about this problem?
Better yet, fix it!
Thanks
David Moffett
(dpm@cs.purdue.edu)
P.S. suggesting a different DOS or Windows telnet client that doesn't
exhibit this problem is also a welcome alternative!