[olug] X tunneling

[Adam Lassek]

Well, if it were that simple I've have done it already. The problem is, there is a computer inbetween the two I want to network at both ends, neither of which are running X. Here's the setup: At my home network, all traffic goes through a Cisco 2500 router that is configured to route all incoming ssh traffic to my server box. From there I usually ssh into my main machine which is on the same network. At the other location, my computer is NATed through a Novell firewall over which I have no control. Does X use port 6000 if it's being forwarded by ssh? I may have to set up the router to forward but I'd rather not forward X all X traffic if at all possible :)

This is why I'm not sure if it's even possible. I'm thinking I might have to set up a VPN to simplify things. And yes, I'm well aware of X's latency issues :)  

-----Original Message-----
From: Christopher Cashell <topher at zyp.org>
Date: Thu, 1 Nov 2001 10:50:21 -0600
To: olug at bstc.net
Subject: Re: [olug] X tunneling


> On Fri, Nov 02, 2001 at 12:34:26AM +0800, Adam Lassek wrote:
> > Has anybody here successfully tunelled X over the internet? I would like
> > to know if it is possible to tunnel an X application through one or more
> > computers, preferrably over ssh. I have done remote X applications
> > before, but that was a direct connection between two computers on the
> > same network. This time, I have a couple hops inbetween and I'm wondering
> > if it would even be possible.
> 
> Yep, I do this regularly.
> 
> Basically, X was designed specifically to be network transparent,
> whether "network" is a LAN or the Internet.  X doesn't care which it
> is, it'll work just as easily (though, depending on connection speed,
> the performance may not be quite as responsive over the net as on a
> LAN).
> 
> Just do things exactly as you would if you were running an X app
> remotely from another computer in the same room.  SSH into the remote
> computer, set your DISPLAY environmental variable[1], and you should be
> ready to go.  Just start up the program (you may want to background it
> (&) in order to continue using your shell while the program runs) and
> use it.  Some hosts disable X forwarding in general in the global
> config file for ssh.  If that's the case, you'll prolly have to pass it
> the '-X' switch to enable it when you log into the remote host.
> 
> [1] If you are running from within X when you make your connection, the
> DISPLAY variable will usually be automatically set for you.
> 
> --
> Christopher
> 
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-- 


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"Nietzsche is dead." -- God

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