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FTP. A virtual server is defined as a service port, and all requests from Internet to this service port

will be redirected to the computer specified by the server IP. Any PC that was used for a virtual

server must have a static or reserved IP address because its IP address may change when using

the DHCP function. You can set up virtual servers on this page, shown in Figure 4-15:

Figure 4-15 Virtual Servers

¾

Service Port

-

The numbers of External Ports. You can type a service port or a range of

service ports (the format is XXX – YYY, XXX is Start port, YYY is End port)

¾

IP Address

-

The IP address of the PC running the service application

¾

Protocol

-

The protocol used for this application, either

TCP

,

UDP

, or

All

(all protocols

supported by the router)

¾

Enable

-

The Enable checkbox to enable the virtual server entry

¾

Common Service Port

-

Some common services already listed in the pull-down list

To setup a virtual server entry:

1.

Select the service you want to use from the Common Service Port list, select the ID you

want to use, and click the

Copy to

button. If the

Common Service Port

list does not have

the service that you want to use, type the number of the service port or service port range in

the

Service Port

box.

2.

Type the IP address of the computer in the

Server IP Address

box.

3.

Select the protocol used for this application, either

TCP

,

UDP

, or

All

.

4.

Select the

Enable

checkbox to enable the virtual server.

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5.

Click the

Save

button.

)

Note:

It is possible that you have a computer or server that has more than one type of available service.

If so, select another service, and enter the same IP address for that computer or server.

To modify a virtual server entry:

1.

Select the entry you want to modify

2.

Modify the information from the

Service Port

, the

IP Address

boxes, and the

Protocol

pull-down list.

3.

Click the

Save

button.

To delete a service entry:

1.

Clear the entry's all information except for the

Protocol

pull-down list.

2.

Click the

Save

button.

To delete all service entries:

1.

Click the Clear

All

button.

2.

Click the Save button.

3.

3.Click the Next button to go to the next page and Click the

Previous

button to return the

previous page.

)

Note:

If you set the virtual server of the service port as 80, you must set the web management port on

Security –> Remote Management

page to be any value except 80 such as 8080. Or else there

will be a conflict to disable the virtual server.

4.6.2 Port Triggering

Some applications require multiple connections, like Internet games, video conferencing, Internet

calling and so on. These applications cannot work with a pure NAT router. Port Triggering is used

for some of these applications that can work with an NAT router. You can set up Port Triggering

on this page shown in Figure 4-16:

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Figure 4-16 Port Triggering

Once configured, operation is as follows:

1.

A local host makes an outgoing connection using a destination port number defined in the

Trigger Port field.

2.

The router records this connection, opens the incoming port or ports associated with this

entry in the Port Triggering table, and associates them with the local host.

3.

When necessary the external host will be able to connect to the local host using one of the

ports defined in the

Incoming Ports

field.

¾

Trigger Port

-

The port for outgoing traffic. An outgoing connection using this port will

"Trigger" this rule

¾

Trigger Protocol

-

The protocol used for Trigger Ports, either

TCP

,

UDP

, or

All

(all protocols

supported by the router)

¾

Incoming Ports Range

-

The port or port range used by the remote system when it

responds to the outgoing request. A response using one of these ports will be forwarded to

the PC that triggered this rule. You can input at most 5 groups of ports (or port section).

Every group of ports must be apart with ",". For example, 2000-2038, 2050-2051, 2085,

3010-3030

¾

Incoming Protocol

-

The protocol used for Incoming Ports Range, either TCP or UDP, or

ALL (all protocols supported by the router)

¾

Enable

-

The Enable checkbox enables port forwarding for the application

¾

Common Applications

-

Some popular applications already listed in the pull-down list

To add a new rule, enter the following data on the

Port Triggering

screen

1.

Enter a port number used by the application when it generates an outgoing request.

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2.

Select the protocol used for

Trigger Port

from the pull-down list, either

TCP

,

UDP

, or

All.

3.

Enter the range of port numbers used by the remote system when it responds to the PC's

request.

4.

Select the protocol used for

Incoming Ports Range

from the pull-down list, either

TCP

,

UDP

, or

All.

5.

Select the

Enable

checkbox to enable.

6.

Click the

Save

button to save the new rule.

There are many popular applications in the

Popular Application

list. You can select it and the ID,

then click the

Copy to

button, the application will fill in the

Trigger Port

,

incoming Ports Range

boxes and select the

Enable

checkbox. It has the same effect as adding a new rule.

Modifying an existing rule:

1.

Edit the entry as desired.

2.

Click the

Save

button.

Deleting an existing rule:

1.

Clear all the content in the

Trigger Port

field, the

Open Port field

and the

Enable

checkbox.

2.

Click the

Save

button.

To delete all rules:

1

Click the

Clear All

button.

2

Click the

Save

button

)

Note:

¾

When the trigger connection is released, the according opening ports will be closed

¾

Each rule allowed to be used only by one host on LAN synchronously. The trigger connection

of other hosts on LAN will be refused

¾

Incoming Port Range cannot overlap each other

4.6.3 DMZ

The DMZ host feature allows one local host to be exposed to the Internet for a special-purpose

service such as Internet gaming or videoconferencing. DMZ host forwards all the ports at the

same time. Any PC whose port is being forwarded must have its DHCP client function disabled

and should have a new static IP address assigned to it because its IP address may change when

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using the DHCP function. You can set up DMZ host on this page shown in Figure 4-17:

Figure 4-17 DMZ

To assign a computer or server to be a DMZ server:

1.

Click the

Enable

radio button

2.

Enter the local host IP address in the

DMZ Host IP Address

field

3.

Click the

Save

button.

)

Note:

After you set the DMZ host, the firewall related to the host will not work.

4.6.4 UPnP

The Universal Plug and Play (UPnP) feature allows the devices, such as Internet computers, to

access the local host resources or devices as needed. UPnP devices can be automatically

discovered by the UPnP service application on the LAN. You can configure UPnP on this page

shown in Figure 4-18:

Figure 4-18 UPnP Settings

¾

Enable UPnP -

UPnP can be enabled or disabled by clicking the

Enable

or

Disable

button.

As allowing this may present a risk to security, this feature is disabled by default

¾

Current UPnP Settings Table -

this table displays the current UPnP information

¾

App Description

-

The description provided by the application in the UPnP request

¾

External Port

-

External port, which the router opened for the application

¾

Protocol

-

Which type of protocol is opened