[gameprogrammer] Re: TCP/IP Problem: NAT

I don't know how it works, but it's an option in sshd to forward X11
connections.  Usually, you have to manually tell the ssh client to
initiate the forwarding (with the -X flag), but sometimes I've seen it
do it by default.

Wish I could help more, but maybe that'll provide you with enough
Google-fodder :).

--
Mando


On Fri, 19 Nov 2004 18:03:09 -0600, Chris Nystrom <cnystrom@xxxxxxxxx> wrote:
> On Fri, 19 Nov 2004 14:02:05 -0600, Bob Pendleton <bob@xxxxxxxxxxxxx> wrote:
> > On Fri, 2004-11-19 at 12:47, Chris Nystrom wrote:
> >
> > Hi Chris, how's it going?
> 
> Good. Thank you for asking. How are you doing?
> 
> > This problem has no solution. NAT is designed to hide all the boxes on
> > one side of the box behind a single IP address. The result is that they
> > cannot be addressed from the other side of the box.
> 
> I suppose that is good news. Knowing for sure that my problem has no
> solution saves me the time in trying to get it to work.
> 
> > NATs can be
> > configured to send requests for specific ports to specific machines
> > behind the NAT. That is handy for hiding servers behind a NAT and for
> > redirecting traffic to different servers. But, it is not a solution to
> > your problem.
> 
> You are right.
> 
> > OTOH, all the machines behind the NAT can address the rest of the world.
> > The solution to your problem is to have the client contact the server,
> > not the other way around.
> 
> Hmmm... I suppose  I could do that.
> 
> > And no, X can't get around NAT either.
> 
> Hmmm... I am on the NAT machine and I SSH to a server, and then I type
> "xclock" and
> the xclock pops right up on the display of the origianal NAT machine.
> How does the xclock app running on the server know how to communicate
> back to the X server running on the NAT machine to display itself?
> 
> I assume this must be some ssh mojo? xclock knows nothing of ssh right
> ? So how does X know how to use the ssh mojo ? More importantly how
> can one set up ones own application to work the same way ?
> 
> Interstingly, the DISPLAY variable that ssh sets up is set to
> localhost...hmmm...a mystery.
> 
> Thank,
> Chris
> 
> 
> 
> --
> Chris Nystrom <cnystrom@xxxxxxxxx>
> http://www.newio.org/~ccn
> AIM: nystromchris
> 
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