Summary: Clarification: looking for a reverse telnet utility for 3.2c

From: George Gallen <ggallen_at_slackinc.com>
Date: Fri, 10 Mar 2000 14:04:29 -0500

First - reason why I need to do reverse telnet.

1. We are on a VPN, so I can't telnet directly.
2. We block telneting on the firewall, and I don't
   want to open it up just for this (even if it is
   to a non-standard telnet port to be mapped to our
   10.10.. machine
3. Since this would be used infrequently, it's not
   worth the security risk of opening up telnet
   through the firewall.
4. The PC is not physically within the VPN, it could
   be anywhere in the world

Unfortunatly, I haven't had too much luck.

I finally found buried in a backup SOMEWHAT what I needed,
It's called sneakin.gz, it has a trojan icmpd which looks
for specific type of ping packets which will wake it up
and then using a combo of netcat & telnet to connect to the
linux machines ports which also has some modified software
running to connect. I haven't tried to compile it under T64
so I don't know if it even works.

Since our system is on a VPN, the ping part won't help, so
I would need to relay the IP via email first. As well this
is tailored to linux and not a PC running Windows (which I
can't change, even if I wanted to)

Now I have most of the pieces, the hard part is going to
be putting them together and getting it work. :)

George Gallen
ggallen_at_slackinc.com
============================================================================
==
VNC was suggested - Possibility - not sure though if with VNC
    you can start up a VNC session on unix, then connect to
    a VNC being run on the PC, so the PC can see the unix side.

    I know, I can start VNC on a PC, then have the unix end
    tie into that, but I suspect, that I'd only be able to
    tie into a VNC session on the PC from the unix end

    So this is still up the air.

Jim Jennis supplied me with some PERL routines to open a socket
    on another machine, now to try to tie on end of the socket
    to a getty process and the other end to a "terminal" type
    display on the PC - I'm sure this will be fun :)
============================================================================
==
Plus others who couldn't figure out why in world I'd want
to telnet to a windows machine, but hey stranger things have happend
suggested looking into a telnetd for windows.
----------------------------------------------------------------------------

--
>From Sunil Bhaskarla,
You could try Pragma Systems telnetd. 
free dl _at_ http://www.ccsi.com/pragma/telnetd.html
----------------------------------------------------------------------------
---
Also from Jim,
You can install UWIN on your PC's. UWIN is a very nice implementation of a
complete ksh + a full set of unix (gnu) tools and development environment
(including perl and Xwindows) in a PC environment. It runs great on NT but
is somewhat of a dog on Win '95
http://www.research.att.com/sw/tools/uwin/
0nce it is installed you can easily telnet or ftp into your NT boxen from
Unix, VMS or any other "real" OS! 
It is amazing to me to telnet into my NT box from Tru64 and get a Unix
login prompt or a system type "unix" on ftp. All the goodies like ls, grep,
etc work. You can even do a 
shutdown -h now
instead of a 3-fingered salute or start>shutdown, etc.
----------------------------------------------------------------------------
--
>-----Original Message-----
>From: George Gallen [mailto:ggallen_at_slackinc.com]
>Sent: Thursday, March 09, 2000 3:12 PM
>To: 'tru64-unix-managers_at_ornl.gov'
>Subject: Clarification: looking for a reverse telnet utility for 3.2c
>
>
>Just want to clarify, that I don't want the unix machine
>to login to the PC, but rater still have the PC login
>to the unix machine. I just want the unix machine to
>initiate the connection (firewall issue).
>
>George
>
>>-----Original Message-----
>>From: George Gallen [mailto:ggallen_at_slackinc.com]
>>Sent: Thursday, March 09, 2000 2:46 PM
>>To: 'tru64-unix-managers_at_ornl.gov'
>>Subject: looking for a reverse telnet utility for 3.2c
>>
>>
>>I am looking for a way to establish a telnet connection 
>>between a PC and
>>our alpha (running 3.2c), but have the alpha initiate the 
>>connection. Is
>>there
>>any easy way to do this? I remember seeing something called 
>>"sneaker" or
>>such, that would trigger a daemon via an ICMP packet to then establish
>>a reverse connection with the PC.
>>
>>The problem is that the IP of the PC will vary, so I want the 
>>PC to send
>>an email to the alpha giving it's IP, then have the alpha 
>using that IP
>>initate the telnet connection.
>>
>>George Gallen
>>Senior Programmer/Analyst
>>Accounting/Data Division
>>ggallen_at_slackinc.com
>>ph:856.848.1000 Ext 220
>>
>>SLACK Incorporated - An innovative information, education and 
>>management
>>company
>>http://www.slackinc.com
>>
>

Received on Fri Mar 10 2000 - 19:03:24 NZDT