Anyone used Doorman?
http://doorman.sourceforge.net/
The basic idea is called "Port Knocking". The firewall has all ports
closed, but keeps an eye on what packets hit what ports. On my remote
laptop, I hit certain ports, in a pre-arranged sequence. The firewall sees
this and opens a port for inbound traffic from my IP address. When I drop
the connection, the port is closed.
More on the subject: http://www.portknocking.org/view/about
I'm in the process of trying to build a very robust VPN, and this will allow
me to keep the ports closed.
Ken Elliott
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