You could use either a VPN or ssh port forwarding.  For ssh port forwarding, it 
would go something like this:

ssh -L 2222:remotemachine:22 username@servername

Then you can do:

ssh -p 2222 someuser@localhost

"servername" is a machine behing the firewall that can receive ssh requests 
from the internet.  "remotemachine" is a machine on the same network as 
"servername", which you want to ssh into (for the purpose of running a backup). 
 The port forwarding makes your local port 2222 pretend to be port 22 on 
"remotemachine". 

This works for one remote host.  You would need to repeat the process for each 
remote host.  You could specify a different port (2223, perhaps), or you could 
re-use port 2222 as long as you end the previous session before starting a new 
one.

This will all have to be worked into a DumpPreUserCmd.

-Rob


On Wed, Jan 28, 2009 at 06:09:13PM +0100, Sam Przyswa wrote:
> Hi,
> 
> Is it a way to backup multiples Windows and Ubuntu machines (up to 200 
> machines) over a firewall on the same port if it's possible ?
> 
> Thanks for your reply.
> 
> Sam.
> 
> 
> 
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