This wizard will help you to configure basic firewall rules. It should be enough for most configurations, but if this is not enough for you, you will have to configure it by hand. The different set of rules are shown in figure 15-18, choose the one that fits your needs.
All ports are open, NAT is not activated (this level is not recommended if the server is to be connected to the Internet).
All ports are open, NAT is activated
Opens only Internet ports corresponding to services configured through this wizard. NAT is activated.
All ports closed but: outgoing HTTP and mail traffic, plus ssh traffic in both directions. NAT is not activated.
It is very important to tell the wizard which network interface card that is used for the gateway to the Internet (figure 15-19). If you specify the wrong device, your firewall will be useless!