The rules above are a basic firewall configuration that will allow HTTP$,$ SSL$,$ FTP$,$ and SMTP traffic from your internal network to the outside world, while blocking all other incoming traffic.The first rule allows HTTP traffic from your internal network to the outside world. This will allow your users to browse the web. The second rule allows SSL traffic from your internal network to the outside world. This will allow your users to make purchases online. The third rule allows FTP traffic from your internal network to the outside world. This will allow your users to download information from the web. The fourth rule allows SMTP traffic into your mail server only. This will allow other mail servers to transfer mail to your company. The fifth rule allows the outside world to access your internal web server. This will allow the public to view your web site. The sixth rule denies all other incoming traffic. This will block all traffic that is not explicitly allowed by the other rules.This firewall configuration will allow the traffic that is necessary for your users to browse the web, make purchases online, and download information from the web. It will also allow other mail servers to transfer mail to your company. However, it will block all other traffic, preventing unauthorized access to your network.