D-Link DSL-2542B Router Manual PDF (Setup & Configuration Guide)

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Section 3 – Configuration

D-Link DSL-2542B User Manual

36

Outbound Filter

To access the

Outbound FIlter

window, click the

Outbound Filter

button in the

Advanced

directory.

The Outbound Filter allows you to create a filter rule to block outgoing IP

traffic by specifying a filter name and at least one condition on this

window. All of the specified conditions in this filter rule must be satisfied

for the rule to take effect. Filters are used to allow or deny LAN or WAN

users from accessing the Internet or your internal network.

Click the

Add/Apply

button and then click the

Reboot

button on the left

panel to let your changes take effect.

Name

Enter a name for the new filter.

Protocol

Select the transport protocol (

TCP

,

UDP, ICMP

,

TCP/

UD

, or

Any

) that will be used for the filter rule.

Source IP Address & Source

Subnet Mask

For an Outbound Filter, this is the IP address or IP

addresses and their associated subnets on your LAN

for which you are creating the filter rule. For an

Inbound Filter, this is the IP address or IP addresses

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 IP Address &

Destination Subnet Mask

Where the Destination IP address and subnet mask

resides also depends on if you are configuring an

Inbound or Outbound 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.

Page 37 / 59

Section 3 – Configuration

D-Link DSL-2542B User Manual

37

Inbound Filter

To access the

Inbound Filter

window, click the

Inbound Filter

button in the

Advanced

directory.

The Inbound Filter allows you to create a filter rule to allow incoming IP

traffic by specifying a filter name and at least one condition on this

window. All of the specified conditions in this filter rule must be satisfied

for the rule to take effect. By default, all incoming IP traffic from the

Internet is blocked when the firewall is enabled.

Click the

Add/Apply

button and then click the

Reboot

button on the left

panel to let your changes take effect.

Name

Enter a name for the new filter.

Protocol

Select the transport protocol (

TCP

,

UDP, ICMP

,

TCP/

UD

, or

Any

) that will be used for the filter rule.

Source IP Address & Source

Subnet Mask

For an Outbound Filter, this is the IP address or IP

addresses and their associated subnets on your LAN

for which you are creating the filter rule. For an

Inbound Filter, this is the IP address or IP addresses

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 IP Address &

Destination Subnet Mask

Where the Destination IP address and subnet mask

resides also depends on if you are configuring an

Inbound or Outbound 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.

Page 38 / 59

Section 3 – Configuration

D-Link DSL-2542B User Manual

38

DNS Setup

To access the

DNS Setup

window, click the

DNS Setup

button in the

Advanced

directory.

The Router can be configured to relay DNS settings from your ISP or

another available service to workstations on your LAN. When using DNS

relay, the Router will accept DNS requests from hosts on the LAN and

forward them to the ISP’s, or alternative DNS servers. DNS relay can use

auto discovery or the DNS IP address can be manually entered by the

user. Alternatively, you may also disable the DNS relay and configure

hosts on your LAN to use DNS servers directly. Most users who are using

the Router for DHCP service on the LAN and are using DNS servers on

the ISP’s network, will leave DNS relay enabled (either auto discovery or

user configured).

If you have not been given specific DNS server IP addresses or if the

Router is not pre-configured with DNS server information, select the

“Obtain DNS server address automatically” option. Auto discovery DNS

instructs the Router to automatically obtain the DNS IP address from the

ISP through DHCP. If your WAN connection uses a Static IP address, auto

discovery for DNS cannot be used.

If you have DNS IP addresses provided by your ISP, click the “Use the

following DNS server addresses” radio button and enter these IP

addresses in the available entry fields for the Preferred DNS Server and

the Alternative DNS Server. When you have configured the DNS settings

as desired, click the

Apply Settings

button and then click the

Reboot

button on the left panel to let your changes take effect.

The Router supports DDNS (Dynamic Domain Name Service). The

Dynamic DNS service allows a dynamic public IP address to be

associated with a static host name in any of the many domains, allowing

access to a specified host from various locations on the Internet. This is

enabled to allow remote access to a host by clicking a hyperlinked URL in

the form

hostname.dyndns.org

, Many ISPs assign public IP addresses

Page 39 / 59

Section 3 – Configuration

D-Link DSL-2542B User Manual

39

using DHCP, this can make it difficult to locate a specific host on the LAN

using standard DNS. If for example you are running a public web server or

VPN server on your LAN, this ensures that the host can be located from

the Internet if the public IP address changes. DDNS requires that an

account be setup with one of the supported DDNS providers.

Tick the Enable Dynamic DNS check box, enter the required DDNS

information, click the

Apply Settings

button, and then click the

Reboot

button on the left panel to let your changes take effect to set this

information in the Router.

Note

Page 40 / 59

Section 3 – Configuration

D-Link DSL-2542B User Manual

40

Firewall & DMZ

To access the

Firewall & DMZ

window, click the

Firewall & DMZ

button in the

Advanced

directory.

Firewalls may conflict with certain interactive applications such as video

conferencing or playing Internet video games. For these applications, a

firewall bypass can be set up using a DMZ IP address. The DMZ IP

address is a “visible” address and does not benefit from the full protection

of the firewall function. Therefore it is advisable that other security

precautions be enabled to protect the other computers and devices on the

LAN. It may be wise to use isolate the device with the DMZ IP address

from the rest of the LAN.

If you want to use video conferencing, for example, and still use a firewall,

you can use the DMZ IP address function. In this case, you must have a

PC or server through which video conferencing will take place. The IP

address of this PC or server will then be the DMZ IP address. You can

designate the server’s IP address as the DMZ by going to the DMZ

Settings section and typing in the IP address in the IP Address

field

provided and then enabling its status by ticking the

Enable DMZ

checkbox, clicking

Apply Settings

,

and then clicking the

Reboot

button

on the left panel to let your changes take effect.

For the system that uses the DMZ IP address, you may want to manually

assign an IP address to it and adjust your DHCP server addresses so that

the DMZ IP address is not included in the DHCP server range. This way

you avoid possible IP address problems if you reboot the DMZ system.

The Firewall Settings

section allows the Router to enforce specific

predefined policies intended to protect against certain common types of

attacks. Stateful Packet Inspection (SPI) is a packet inspection process

that blocks unwanted and unrequested packets trying to reach PCs on

your LAN. A DoS "denial-of-service" attack is characterized by an explicit

attempt by attackers to prevent legitimate users of a service from using

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