Section 3 – Configuration

D-Link DSL-2540U User Manual

41

NAT

To access the

Network Address Translation (NAT) Setup

window, click the

NAT

button in the

Advanced Setup

directory. The

NAT

button

appears when configuring WAN interface in PPPoA, PPPoE, MER or IPoA.

Virtual Servers

This window is used to configure virtual server. You can add, delete, and

modify virtual server on this window.

If you are setting up the virtual server, click the

Add

button.

You can configure the service settings on this window by clicking the

Select a Service

radio button and then using the drop-down list to choose

an existing service, or by clicking the

Custom Server

radio button and

entering your own Application Rule in the field provided.

Click

Save/Apply

when you are finished with the virtual server

configuration.

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42

Port Triggering

Some applications such as games, video conferencing, remote access

applications and others require that specific ports in the Router's firewall

be opened for access by the applications. You can configure the port

settings from this screen by selecting an existing application or creating

your own (Custom application).

Click the

Add

button to configure port triggering.

You can configure the port settings on this window by clicking the

Select

an application

radio button and then using the drop-down list to choose

an existing application, or by clicking the

Custom application

radio

button and entering your own Application Rule in the field provided.

Click

Save/Apply

when you are finished with the port setting

configuration. The new Application Rule will appear in the Port Triggering

table.

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43

DMZ Host

Since some applications are not compatible with NAT, the Router supports

use of a DMZ IP address for a single host on the LAN. This IP address is

not protected by NAT and will therefore be visible to agents on the Internet

with the right type of software. Keep in mind that any client PC in the DMZ

will be exposed to various types of security risks. If you use the DMZ, take

measures (such as client-based virus protection) to protect the remaining

client PCs on your LAN from possible contamination through the DMZ.

To designate a DMZ IP address, type in the IP Address of the server or

device on your LAN, and click the

Save/Apply

button.

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44

Security

To access the

Security

window, click the

Security

button in the

Advanced Setup

directory. The

Security

button appears after configuring WAN

interface in PPPoA, PPPoE, MER or IPoA.

IP Filtering

The

IP Filtering

button appears when configuring WAN interface in PPPoA, PPPoE, MER or IPoA.

IP Filtering - Outgoing

This window allows you to create a filter rule of

Outgoing

.

Click

change default policy

to change the mode of policy.

Now default policy is

ACCEPT

, it means all outgoing IP traffic from LAN is

allowed, but some IP traffic can be Blocked by setting up filters.

If you are setting up the outgoing IP filtering, click the

Add

button.

Now default policy is

BLOCK

, it means all outgoing IP traffic from LAN is

blocked, but some IP traffic can be accepted by setting up filters.

If you are setting up the outgoing IP filtering, click the

Add

button.

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45

Enter the information in the section. Explanations of parameters are

described below. Click the

Save/Apply

button to add the entry in the

Active Outbound IP Filtering table.

Filters

Parameter

Description

Filter Name

Enter a name for the new filter.

Protocol

Select the transport protocol (Any, TCP/UDP, TCP, UDP or ICMP) that will be used for the filter rule.

Select either

IP address

or

Netmask

to show different items.

Source IP Address

Enter the start and end IP address for the range of IP addresses which you are creating the

filter rule.

Select IP Range

by

Source IP Address & Source

Subnet Mask

This is the IP address and their associated subnets for which you are creating the filter rule.

Source Port

The Source Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or Inbound

Filter rule.

Destination Port

The Destination Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or

Inbound Filter rule.