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SSH X11 Tunnelling (X11 Forwarding)

To use any of the graphical interfaces on the NSCCS cluster, some kind of X-Windows emulator is required and you will need to log onto the machine using SSH X11 Tunnelling (X11 Forwarding). The same is true for all other X-Windows applications you wish to access remotely.

To access X-Windows applications on Magellan, you will need to connect to magellan.rl.ac.uk.

From Linux/Unix:

There are 2 methods to set up the Linux/Unix machine to use SSH X11 Tunnelling.

Method 1:-

1. Open an xterm terminal.

2. Type the following to add Magellan to the list of host names allowed to make connections to the X server:

   xhost +magellan.rl.ac.uk

3. ssh to Magellan following the steps as shown in the previous guide.

4. You now need to set the DISPLAY environment variable.

   If you are using csh on Magellan, use the following command:

   setenv DISPLAY display-machine-IP:0.0

   If you are using ksh on Magellan, use the following command:

   export DISPLAY=display-machine-IP:0.0

   where display-machine-IP is the IP address of the machine you wish the display to appear on.

Method 2:-

Alternatively, this is done automatically if you log in using the following command:

ssh -X -l user_id magellan.rl.ac.uk

where user_id is your RAL userid. You will now be prompted for your password to log onto the machine.

From Mac OSX:

Open the X11 application and follow the same procedure detailed above for Linux/Unix.

Note: If you are using Tiger (10.4), please replace -X with -Y.

From Windows PC (Windows XP):

This example uses SSH Secure Shell from SSH Communications Security Corp. and Exceed X Server for Win 32 (version 9.0.0.0) on Windows XP Professional.

**Please note that if the graphical package requires OpenGL, you will need to use Exceed 3D.**

1. Start Exceed (Not Exceed (XDMCP-Broadcast)). An Exceed button will appear on your taskbar.

2. You will need to change the Exceed configuration. Under Network and Communication, select the chosen Mode to be Passive. Under Display and Video, select Window Mode to be Multiple.

3. Start the SSH Secure Shell Client.

4. Click on Settings and under Profile Settings, enable Tunnel X11 connections and save settings.

5. Click on Quick Connect and log onto your Magellan account as before.

6. An X-Windows window will automatically open whenever an X-Windows program is started in the remote Unix host.

 

Further examples can be found in the NSCCS User Guide.

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