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Full Discussion: X11 forwarding through a tunnel
Operating Systems Linux Red Hat X11 forwarding through a tunnel Post 302895667 by tsreyb on Tuesday 1st of April 2014 05:10:49 PM
Old 04-01-2014
X11 forwarding through a tunnel
Is it possible to launch an X11 application and have it use an X11 server on the other side of a bastion host? Specifically, here's my setup:


my laptop ------------- bastion -------------- remote host

I have putty installed on my laptop. The bastion is rhel 6.5 and the remote host is CentOS 6.3. Also, putty is installed on the bastion. I have an X Server running on my laptop.

Using xclock as a test app, what works fine are these two scenarios:

Code:
      my laptop ------------- bastion -------------- remote host

[A]  X Server <------------- xclock

[B]                            X Server <----------- xclock

.. in each case I needed to set up X11 forwarding, and that is working fine.

However, what I'm really trying to get is xclock from the remote host to display all the way back on my laptop's X Server:

Code:
      my laptop ------------- bastion -------------- remote host

      X Server <------------- [       ] <------------- xclock

My tools on both the laptop and bastion are either putty or ssh.

I tried, for example, running this from my laptop:

Code:
remote% ssh -X user@bastion ssh -X user@remotehost xclock

or:

laptop% ssh -X user@bastion ssh -X user@remotehost 
remote% xclock


I thought maybe I need an ssh tunnel on the bastion, but the X11 packets seem to be coming on the ssh port (22), so I wasn't exactly sure how to set up the tunnel. I tried source port 22 destination laptop:6000 (and 6010) to no avail.

.
 

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LEARN ABOUT XFREE86

xon

XON(1)							      General Commands Manual							    XON(1)

NAME

       xon - start an X program on a remote machine

SYNOPSIS

       xon remote-host [-access] [-debug] [-name window-name] [-nols] [-screen screen-no] [-user user-name] [command ...]

DESCRIPTION

       Xon runs the specified command (default xterm -ls) on the remote machine using rsh, remsh, or rcmd.  Xon passes the DISPLAY, XAUTHORITY and
       XUSERFILESEARCHPATH environment variables to the remote command.

       When no command is specified, xon runs 'xterm -ls'.  It additionally specifies the application name to be 'xterm-remote-host' and the  win-
       dow title to be '-fIremote-host'.

       Xon  can  only  work  when  the	remote host will allow you to log in without a password, by having an entry in the .rhosts file permitting
       access.

OPTIONS

       Note that the options follow the remote host name (as they do with rlogin).

       -access
	      Runs xhost locally to add the remote host to the host access list in the X server.  This won't work unless xhost is given permission
	      to modify the access list.

       -debug Normally,  xon  disconnects the remote process from stdin, stdout and stderr to eliminate the daemon processes which usually connect
	      them across the network.	Specifying the -debug option leaves them connected so that error messages from the  remote  execution  are
	      sent back to the originating host.

       -name window-name
	      This specifies a different application name and window title for the default command (xterm).

       -nols  Normally xon passes the -ls option to the remote xterm; this option suspends that behaviour.

       -screen screen-no
	      This changes the screen number of the DISPLAY variable passed to the remote command.

       -user user-name
	      By  default, xon simply uses rsh/remsh/rcmd to connect to the remote machine using the same user name as on the local machine.  This
	      option cause xon to specify an alternative user name.  This will not work  unless  you  have  authorization  to  access  the  remote
	      account, by placing an appropriate entry in the remote users .rhosts file.

BUGS

       Xon can get easily confused when the remote-host, user-name or various environment variable values contain white space.

       Xon has no way to send the appropriate X authorization information to the remote host.

XFree86 							   Version 4.7.0							    XON(1)
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