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Chapter 3 Configuration
65
several pre-defined popular application and their port number.
Protocol: Select the properly protocol for the application.
Port: Input the port number for the application.
IP Address: Input the IP address that you want to allow accessing from outside users.
DMZ: The DMZ Host is a local computer exposed to the Internet. Therefore, an
incoming packet will be checked by the Firewall and NAT algorithms, then passed to the
DMZ host when a packet is not sent by a hacker and not limited by the virtual server list.
If you have disabled the NAT option in the WAN-ISP section, this Virtual
Server function will hence be invalid.
If the DHCP server option is enabled, you have to be very careful in
assigning the IP addresses of the virtual servers in order to avoid conflicts.
The easy way is that the IP address assigned to each virtual server should
not fall into the range of IP addresses that are to be issued by the DHCP
server. You can configure the virtual server IP address manually, but it is
still in the same subnet with the router.
3.6.3.6.1 An Example of Configuring a Web Server on the Local Network
To save time to configure, this router has listed the well-known protocol and port
number that stands for the most popular applications on the Virtual Server table, e.g.
Web (TCP/80), FTP (TCP/21), Telnet (TCP/23), SMTP (TCP/25), POP3 (TCP/110), IKE
(UDP/500), etc. This is an example to configure a Web server, just check Enable, and
input the IP address of the Web server.
Background of the Example
Setup the Web server in the office that can be visible to the outside network.
Configuring a Virtual Server
1. Set Web server IP address to a fixed IP = 192.168.1.100
2. Configure the Virtual Server