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question about x11 forwarding in ssh

from [Andre Charbonneau] Network Security [Permanent Link]
Subject: question about x11 forwarding in ssh
Date: Wed, 21 Sep 2005 11:11:35 -0400
Hi,
I'm currently trying to debug a SSH client implementation library which tries to do x11 forwarding. In the code it tries to open a socket to localhost:6000 when a x11 channel request arrives (on the ssh client side). But I get a 'connection refused'. I checked my system configurations and indeed my xserver is started with "-nolisten tcp", so this explains why I can't connect to port 6000.

But I've read somewhere that someone should only open port 6000 only if they really really need it, and that they should use ssh x11 forwarding instead.

But my question is: How does the SSH client (openSSH for example) forwards x11 when port 6000 is not open??? Does it use another, special port that it can connect to?
Is there a document online that I can read that explains in details how ssh does the x11 forwarding?


Thanks!
   Andre

--
Andre Charbonneau

100 Sussex Drive, Rm 2025
Research Computing Support, IMSB
National Research Council Canada
Ottawa, ON, Canada K1A 0R6


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