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Re: Telnet to BSDI still not working

From: Shawn Hogan
Date: Monday, July 20, 1998
Time: 7:15:29 pm

Graeme Easton wrote:

>Don't know if this helps, but I just used optigold to telnet to a BSDI 2.1
>machine, and it did the same thing...connected and stopped. I did a "who" on
>the bsdi machine, and it showed the connection from optigold running:
>
>tset -s -m network
>
>So I looked at my .login, it had my terminal type set as xterm...so i remmed
>that line out....and it fixed the problem......

Hmmmm... interesting... is that with the new or the old telscrpt.exe?


Well, I've spent a good part of the day today breaking down the telnet
negotiation sequence... This is the negotiation that goes on when a
telnet session is started to one of the BSDI machines (before you see
anything):

Requests Terminal Type
Requests Terminal Speed
Requests X Display Location
Requests New Environment Option
Requests Environment Option
Desires To Supress Go Ahead Characters
Requests Echo Mode
Requests Linemode
Requests About Window Size
Desires To Confirm Options
Requests Remote Flow Control
Desires To Supress Go Ahead Characters
Desires Echo

The old telscrpt.exe just told the server "I'm not telling" to each
option. The NEW telscrpt.exe still tells the server "I'm not telling",
but it also tells the server to "Stop Asking".

So by telling it to stop asking, the BSDI machines actually do start the
session (the headers come through)... But, immediately following the
header and right before the login line (you can see it in debugger mode),
the serrver drops the connection. And it only seems to be BSDI.

So my desk has become a huge RFC stockpile so I have the documentation
for each and every requested negotiation. And, I also obtained the
source-code to a commercial telnet program that a friend of mine wrote to
try and pick it apart to see what the difference in negotiation is.

Anyway... back to researching this. :-)

- Shawn

-------------------------------
Shawn D. Hogan
President, Data Point Solutions
http://www.data-point.com
(619) 452-3696
ICQ: 8319647



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