[stunnel-users] Connecting stunnels

Juhasz Gabor Gabor.Juhasz at KONE.com
Thu Mar 31 11:20:11 CEST 2016


Hi Ludolf,

Thanks for your reply.

>in your picture above, I don't understand who is supposed to establish
>the connection (i.e. who is to act as a client) and who is supposed
>to wait for connections (i.e. who is to act as a server).

There are 2 clients (left and right side) and the middle is the server

[host1] ------------- [host2] ------------ [host3]
[stunnel client] ---> [stunnel server] <-- [stunnel client]
[telnet client] ----> [tunnelserver] ----> [telnet server]

These arrows are on my original pictures.

The server has 2 instances of stunnel and I'd like to connect them somehow.

>/Maybe/ you are thinking of running the stunnel instance in server
>mode on a different host than the telnet server:
No, I do not think it.

Kind regards,
Gabor

________________________________________
From: stunnel-users [stunnel-users-bounces at stunnel.org] on behalf of Ludolf Holzheid [lholzheid at bihl-wiedemann.de]
Sent: Thursday, March 31, 2016 11:19 AM
To: stunnel-users at stunnel.org
Subject: Re: [stunnel-users] Connecting stunnels

On Thu, 2016-03-31 06:16:24 +0000, Juhasz Gabor wrote:
> Hi Ludolf,
>
> Thanks for you reply.
>
> Sorry, my first explanation was a bit fuzzy.
>
> I modofied your picture a bit to explain what I want :
>
>    stunnel client          stunnel server          stunnel client
>  +---------------+       +------------------+    +---------------+
>  |               |       |                  |    |               |
>  | telnet client |       |    5.6.7.8:993 <======== 4.5.6.7:y    |
>  | 127.0.0.1:x   |       |      stunnel     |    |    stunnel    |
>  |  :            |       |    127.0.0.1:q   |    |  127.0.0.1:p  |
>  |  :            |       |         :        |    |       :       |
>  |  V            |       |         :        |    |       :       |
>  | 127.0.0.1:23  |       |    127.0.0.1:z   |    |       V       |
>  | stunnel       |       |        stunnel   |    | 127.0.0.1:23  |
>  | 1.2.3.4:y ===============> 5.6.7.8:992   |    |  telnetserver |
>  |               |       |                  |    |               |
>  +---------------+       +------------------+    +---------------+

Hi Gabor,

in your picture above, I don't understand who is supposed to establish
the connection (i.e. who is to act as a client) and who is supposed
to wait for connections (i.e. who is to act as a server).

An IP connection is similar to a telephone connection.  The caller
(acting as the client) is supposed to dial the number of the callee's
phone and the callee (acting as the server) is supposed to sit next to
this very phone, waiting for incoming connections.

In my picture, I tried to depict this by giving the connections 'a
direction':  The unit at the arrow head is the server, the unit at the
arrow tail is the client.


/Maybe/ you are thinking of running the stunnel instance in server
mode on a different host than the telnet server:

 telnet client's host      intermediate host     telnet server's host
  +---------------+       +------------------+    +----------------+
  |               |       |                  |    |                |
  | telnet client |       |                  |    |                |
  | 127.0.0.1:x   |       |                  |    |                |
  |  :            |       |                  |    |                |
  |  :            |       |                  |    |                |
  |  V            |       |                  |    |                |
  | 127.0.0.1:23  |       |    5.6.7.8:z ............> 4.5.6.7:23  |
  | stunnel       |       |    stunnel       |    |    telnet      |
  | 1.2.3.4:y ===============> 5.6.7.8:992   |    |    server      |
  |               |       |                  |    |                |
  +---------------+       +------------------+    +----------------+

This is essentially the same as my first picture except for the
'connect' statement in the configuration file of the stunnel in server
mode.

Ludolf

--

Ludolf Holzheid

Bihl+Wiedemann GmbH
Floßwörthstraße 41
68199 Mannheim, Germany

Tel: +49 621 33996-0
Fax: +49 621 3392239

mailto:lholzheid at bihl-wiedemann.de
http://www.bihl-wiedemann.de

Sitz der Gesellschaft: Mannheim
Geschäftsführer: Jochen Bihl, Bernhard Wiedemann
Amtsgericht Mannheim, HRB 5796
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