Re: Help setting DISPLAY to an ipmasq'd machine.

[Eduardo Gargiulo <xgnu@Yahoo.COM>]

Andrew Perrin wrote:
> 
> Yes, you're doing it wrong.
> 
> 1.) You don't need two ssh sessions; just one, from xserver_machine to
> work_linux_box:
>         ssh -C -X work_linux_box from xserver_machine
> 
> 2.) When you set the display to ipmasq_box:0.0, you're asking the
remote
> host to display X apps on the main display of your ipmasq_box  - which,
> luckily, your ipmasq_box refuses to do. What you want to do is route X
> packets through your ssh tunnel. Most ssh servers set $DISPLAY
> appropriately, so before doing the export DISPLAY part, do:
> 
> echo $DISPLAY
> 
> DISPLAY should contain the name of the *remote* host, followed by a
colon,
> then x.0 where x>1. Mine contains:
> 
> aperrin@achebe:~$ ssh -X isis.unc.edu
> aperrin@login2 ~ >echo $DISPLAY
> login2.isis.unc.edu:11.0
> 
> If you don't get that, I'm not entirely sure how to figure out which
> display will tunnel for you (the 11.0 in this case). Maybe others can
help
> there.
> 
> The theory is this: you open a connection from your firewalled machine
to
> your work machine. You do this in a secure way, using ssh, that is
> permitted by both firewalls. You then use this secure channel to funnel
X
> packets through. X client apps on your work box "display" to a dummy
> server on the same machine, so far as they know. That dummy server,
> though, catches the packets and sends them over the pre-existing ssh
> tunnel to your xserver_machine, where your ssh client grabs them back
and
> sends them to xserver_machine's local X server.
> 
> Hope this helps.
> 

I'm very interested in have X11 ssh tunnel working !!
but I have the same problem.

How can I force ssh server to set DISPLAY variable? 
If DISPLAY variable is not set when I ssh the *remote* server,
is it a sshd problem or an Xserver problem?

thanks

--xgnu