Here is what my sysadmin had to say about this aspect of ssh:
---------------------------
Hi Alex
This part is true:
> It is my understanding that using a device such as $REMOTEHOST:0.0 would
> send the x-windows information in the clear on the normal x port (what ever
> that is)
However, ssh always sets up the DISPLAY variable to be localhost:M.0 where
'localhost is the machine you are ssh'd into, and 'M' is some unique number
(starting at 10, I believe). This is how it does the encrypted tunneling.
So to make sure you have an encrypted X connection, just check that the
DISPLAY variable.
For example, when you ssh into mailey from p36, your DISPLAY var will be
something like 'mailey:11.0'. This is encrypted. If you set
DISPLAY=physical36:0.0 then it won't be encrypted.
--------------------
I have to admit I had done it always wrong because I didn't know
better, being used to exporting the DISPLAY variable manually when I
telnet into a different host.
Best regards, Alex Angerhofer.
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