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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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Section 3 – Configuration
D-Link DSL-2540U User Manual
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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Section 3 – Configuration
D-Link DSL-2540U User Manual
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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Section 3 – Configuration
D-Link DSL-2540U User Manual
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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Section 3 – Configuration
D-Link DSL-2540U User Manual
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.
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