Net::SSH::Gateway is a library for programmatically tunneling connections to 
servers via a single "gateway" host. It is useful for establishing Net::SSH 
connections to servers behind firewalls, but can also be used to forward ports 
and establish connections of other types, like HTTP, to servers with i
restricted access.

* Easily manage forwarded ports
* Establish Net::SSH connections through firewalls

WWW: http://net-ssh.rubyforge.org/gateway