I have 2 Linux systems, with a firewall system in between them. Call them SysA and SysB. From SysA, I can ssh into SysB. But I can't do the reverse - the firewall won't allow my to come back in. Is it possible to set up a VPN between those 2 systems so that I can ssh back to SysA from SysB? I'm not familiar with VPN setups, so this may be a very simple question. If so, what programs do I need to look at and are there tutorials available for setting things up?

I'm running recent Fedora systems (12 and 13) on these machines

thanks,

nbc

You may be able use a VPN, but if all your are interested in is SSH, it would be over kill. A VPN would create a virtual adapter that gives the client an IP in the range of the host so that for all practical purposes they are on the same network; just logically instead of physically.

I would suggest that you look into port forwarding on your firewall. In case you haven't already, you should also be sure to secure your SSH server(s) and by that I mean more than use a non standard port.