[Fwd: Re: Local tunneling question]

-------- Original Message --------
Subject: 	Re: [Sshtools-users] Local tunneling question
Date: 	Wed, 16 May 2007 11:25:03 -0400
From: 	Andre Charbonneau <[email protected]>
To: 	Sascha Hunold <[email protected]>
References: 	<[email protected]> 
<[email protected]>



Sascha Hunold wrote:
> Andre Charbonneau wrote:
>   
>>       // Create a tunnel for the VNC traffic.
>>         ForwardingClient forwarding = ssh.getForwardingClient();
>>         forwarding.addLocalForwarding("VNC", "0.0.0.0", 5920, 
>> "localhost", 5920);
>>         forwarding.startLocalForwarding("VNC");
>>       System.out.println("VNC tunnel started.");
>>       
>>         // And also open a shell to see what's going on...
>>         SessionChannelClient session=ssh.openSessionChannel();
>>         if (!session.requestPseudoTerminal("vt100",80,24,0,0,""))
>>           System.out.println("Failed to allocate a pseudo terminal");
>>         if (session.startShell())
>>         {
>>           InputStream in=session.getInputStream();
>>           OutputStream out=session.getOutputStream();
>>           IOStreamConnector input=new IOStreamConnector(System.in,out);
>>           IOStreamConnector output=new IOStreamConnector(in,System.out);
>>           output.getState().waitForState(IOStreamConnectorState.CLOSED);
>>         }
>>
>>
>> My tightvnc server is listening on a.b.c:5920.
>>   
>>     
>
> I think you will need remote forwarding as well.
>
> The problem is then that 5920 is not free on the remote side. So, I
> think you will have to change the send port of tightvnc (if it is 5920).
>
> And that's just my guess (I have successfully done tunneling with
> SSHTools but it was years ago).
>
> It is much easier to use the openssh binaries for testing and to do some
> experiments to find the correct port configuration.
>   
When I use openssh, I do the following to start the VNC server on a.b.c, 
setup the tunnel between my desktop system and a.b.c and then start the 
VNC viewer:

On a.b.c:
   Xvnc :20 -localhost

On my desktop:

   ssh -l spgrid -L 5920:127.0.0.1:5920 a.b.c
   xvncviewer localhost::5920

This is what I'm trying to replicate using the sshtools libraries to 
create the SSH tunnel.

Regards,
   Andre



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