if a local pc, with a private address of 192.168.0.33, acts as a web and ftp server, configure the ports menu to forward ports 80 (http) and 21 (ftp) to local address 192.168.0.33 as shown in table 5-4.
table 5-4. port table entries (example)

in order for a remote user to access this server from the internet, the remote user must know the ip address that has been assigned by your isp. if this address is 172.16.1.23, for example, an internet user can access your web server by directing the browser to http://172.16.1.23. the assigned ip address can be found in the maintenance status menu, where it is shown as the wan ip address.
some considerations for this application are:
1?if your account's ip address is assigned dynamically by your isp, the ip address may change periodically as the dhcp lease expires.
2?if the ip address of the local pc is assigned by dhcp, it may change when the pc is rebooted.
to avoid this, change the configuration of your pcs to use fixed private addresses rather than dhcp-assigned addresses.
3?local pcs must access the local server using the pcs?local lan address (192.168.0.33 in this example). attempts by local pcs to access the server using the external ip address (172.16.1.23 in this example) will fail.