How do you know if a tunnel is working?

From: Cylurian (fsromero@hotmail.com)
Date: 12/24/02 

From: fsromero@hotmail.com (Cylurian)
Date: 24 Dec 2002 01:29:10 -0800

How do you know if a tunnel is really working?

Someone said do this:

ssh -v ...

What is that suppose to mean? How do I know if my tunnel is working?
What are some of the key words if any to identify if the port
forwarding is really working, when I do -v? What software can I use to
sniff or look at the packets? Perhaps I can see if the information is
not clear text or is clear text when the port forwarding is not
working.

Any suggestions.

thx

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