Reverse SSH Tunneling, 
	...or how the cat can get the rodent behind the firewall

Linux box behind your NAT  (rodent) has 10.10.10.45 
External Linux box on the net (cat) has	123.24.26.201

THE GOAL have the cat get the rodent:  
-------------------------------------------------------------------------
	cat (123.24.26.201) -> |NAT| ->  rodent (10.10.10.45) 
-------------------------------------------------------------------------
1. SSH from the rodent to the cat (with public ip) using command below:
	(ok, so the analogy collapses horribly here... we have a suicidal mouse...
	or, we have a mouse taunting the cat, yeah, that's it...)

	ssh -R 19999:localhost:22   catuser@123.24.26.201
		* port 19999 can be any unused port.

2. Now you can SSH from cat to rodent through SSH tuneling:
		ssh localhost -p 19999


Other servers can also access rodent (10.10.10.45) through the cat (123.24.26.201).

	BillyBob's server -> cat (123.24.26.201) -> |NAT|  -> rodent (10.10.10.45) 

	1 From BillyBob's server:
		ssh catuser@123.24.26.201
	2 After the login to cat:
		ssh localhost -p 19999

	* the connection between rodent and cat must be alive at all time.
	the best way to do this is make the connection with 
		ssh -R 19999:localhost:22   catuser@123.24.26.201
	and then run "top" - this will keep the connection alive.