A Virtual Server is defined as a service port, and all requeststo this port will be redirected to the computer specified by theserver IP. For example, if you have an FTP Server (port 21) at192.168.0.5, a Web server (port 80) at 192.168.0.6, and a PPTP VPNserver at 192.168.0.7, then you need to specify the followingvirtual server-mapping table: