DSL-2520U

ADSL2/2+ Router with USB and Ethernet Ports

User Manual

Configuring via Web-based Interface

Figure 40. The page for adding a virtual server.

You can specify the following parameters:

Parameter

Description

Template

Select a virtual server template from the drop-down list, or select

Custom

to specify all parameters of the new virtual server

manually.

Name

A name for the virtual server for easier identification. You can

specify any name.

Interface

A WAN connection to which this virtual server will be assigned.

Protocol

A protocol that will be used by the new virtual server. Select a value

from the drop-down list.

Public port (begin)/

Public port (end)

A port of the router from which traffic is directed to the IP address

specified in the

Private IP

field. Specify the start and the end value

for the port range. If you need to specify one port, enter the needed

value in the

Public port (begin)

field and leave the

Public port

(end)

field blank.

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DSL-2520U

ADSL2/2+ Router with USB and Ethernet Ports

User Manual

Configuring via Web-based Interface

Parameter

Description

Private port (begin)/

Private port (end)

A port of the IP address specified in the

Private IP

field to which

traffic is directed from the

Public port

. Specify the start and the

end value for the port range. If you need to specify one port, enter

the needed value in the

Private port (begin)

field and leave the

Private port (end)

field blank.

Private IP

The IP address of the server from the local area network.

Click the

Change

button.

To edit the parameters of an existing server, select the relevant server in the table. On the opened

page, change the needed parameters and click the

Change

button.

To remove an existing server, select the relevant server in the table. On the opened page, click the

Delete

button.

DMZ

A DMZ is a host or network segment located “between” internal (local) and external (global)

networks. In the router, the DMZ implements the capability to transfer a request coming to a port of

the DSL router from the external network to a specified host of the internal network.

On the

Firewall / DMZ

page you can specify the IP address of the DMZ host.

Figure 41. The

Firewall / DMZ

page.

To enable the DMZ, select the

Enabled

checkbox, enter the IP address of a host from your

network in the

IP address

field, and click the

Change

button.

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DSL-2520U

ADSL2/2+ Router with USB and Ethernet Ports

User Manual

Configuring via Web-based Interface

Note that when the DMZ is enabled, all traffic coming to a port of the WAN interface of the router

is directed to the same port of the specified IP address. Also note that virtual servers have higher

priority than the DMZ host. In other words, if there has been created a virtual server that directs

traffic from external port 80 to a port of the device from the router's local network, then entering

http://router_WAN_IP

in the address bar, users of the external network are directed to the

specified port and IP address configured for the virtual server, but not to port 80 of the device with

the IP address specified on the

Firewall / DMZ

page.

To disable the DMZ, deselect the

Enabled

checkbox and click the

Change

button.

Application Rules

On the

Firewall / Application rules

page, you can define rules for the Port Triggering function.

Figure 42. The

Firewall / Application rules

page.

To add a new rule for the Port Triggering function, click the

Add

button.

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DSL-2520U

ADSL2/2+ Router with USB and Ethernet Ports

User Manual

Configuring via Web-based Interface

Figure 43. The page for adding a rule for the Port Triggering function.

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DSL-2520U

ADSL2/2+ Router with USB and Ethernet Ports

User Manual

Configuring via Web-based Interface

You can specify the following parameters:

Parameter

Description

Application rule editing

Rules name

A name for the rule for easier identification.

Interface

A WAN connection to which this rule will be assigned.

Incoming port and protocol settings

Protocol

A protocol to which this rule will be applied upon receiving data to

the specified port or port range.

Starting port/

Ending port

A range of the router's ports which will be open to receive data from

the external network (incoming traffic). Specify the start and the end

value for the port range. If you need to specify one port, enter the

needed value in the

Starting port

field and leave the

Ending port

field blank.

Outgoing port and protocol settings

Protocol

A protocol to which this rule will be applied upon transferring data

from the specified port or port range.

Starting port/

Ending port

A range of the router's ports from which data are transferred to the

external network (outgoing traffic). Specify the start and the end

value for the port range. If you need to specify one port, enter the

needed value in the

Starting port

field and leave the

Ending port

field blank.

Click the

Change

button.

To edit an existing rule for the Port Triggering function, select the relevant rule in the table. On the

opened page, change the needed parameters and click the

Change

button.

To remove an existing rule for the Port Triggering function, select the relevant rule in the table. On

the opened page, click the

Delete

button.

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