Web Configuration

D-Link DSL-2640B User Manual

52

Click

Add

to add a bridge filter. The page as shown in the figure appears.

The table describes the parameters in this page.

Field

Description

Protocol Type

Select the protocol type to be mapped from the

drop-down list. You can select

PPPoE

,

IPv4

,

IPv6

,

AppleTalk

,

IPX

,

NetBEUI

, or

IGMP

.

Destination

MAC

Address

Enter the destination MAC address to be mapped.

Source MAC Address

Enter the source MAC address to be mapped.

Frame Direction

Select the frame direction to be mapped from the

drop-down list. The device supports frame direction from

LAN to WAN and that from WAN to LAN.

Schedule

Select the time that you want to apply the rule from the

drop-down list. You can select

always

or

never

.

Wan interface

Select the WAN interface to be mapped from the

drop-down list.

Click

Apply

to save the settings.

Web Configuration

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53

Firewall Settings

A denial-of-service (DoS) attack is characterized by an explicit attempt by attackers to prevent legitimate users of a service from using that service. Examples include the

following

°

The attackers attempt to flood a network, thereby preventing legitimate network traffic

°

The attackers attempt to disrupt connections between two machines, thereby preventing access to a service

°

The attackers attempt to prevent a particular individual from accessing a service

°

The attackers attempt to disrupt service to a specific system or person.

Port scan protection is designed to block attempts to discover vulnerable ports or services that might be exploited in an attack from the WAN.

Choose

ADVANCED

>

Firewall Settings

. The page shown in the right figure appears.

Click

Apply

to save the settings.

Web Configuration

D-Link DSL-2640B User Manual

54

DNS

Domain name system (DNS) is an Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they are easier to remember.

The Internet, however, is actually based on IP addresses. Each time you use a domain name, a DNS service must translate the name into the corresponding IP address.

For example, the domain name www.example.com might be translated to 198.105.232.4.

The DNS system is, in fact, its own network. If one DNS server does not know how to translate a particular domain name, it asks another one, and so on, until the correct

IP address is returned.

Choose

ADVANCED

>

DNS

. The page as shown in the figure appears.

The table describes the parameters in this page.

Field

Description

Obtain DNS server

address automatically

If you select this radio button, the device automatically

obtains IP address of the DNS server from the ISP. You

need not manually enter the IP address of the server.

Use

the

following

DNS

server

addresses

If you select this radio button, you need to manually enter

the IP address of the server provided by the ISP.

Preferred DNS server

Enter the IP address of the primary DNS server.

Alternate DNS server

Enter the IP address of the secondary DNS server. If the

primary DNS server fails to work, the device tries to

connect the secondary DNS server.

Click

Apply

to save the settings.

Web Configuration

D-Link DSL-2640B User Manual

55

Dynamic DNS

The device supports dynamic domain name service (DDNS). The dynamic DNS service allows a dynamic public IP address to be associated with a static host name in any

of the many domains, and allows access to a specified host from various locations on the Internet. Click a hyperlinked URL in the form of hostname.dyndns.org and allow

remote access to a host. Many ISPs assign public IP addresses using DHCP, so locating a specific host on the LAN using the standard DNS is difficult. For example, if you

are running a public web server or VPN server on your LAN, DDNS ensures that the host can be located from the Internet even if the public IP address changes. DDNS

requires that an account be set up with one of the supported DDNS service providers (DyndDNS.org or dlinkddns.com).

Choose

ADVANCED

>

Dynamic DNS

. The page shown in the right page appears.

Click

Add

to add dynamic DNS. The page shown in the right figure appears.

°

DNS provider

: Select one of the DDNS registration organizations from the down-list

drop.

°

Host Name

: Enter the host name that you registered with your DDNS service

provider.

°

Username

: Enter the user name for your DDNS account.

°

Password

: Enter the password for your DDNS account.

Click

Apply

to save the settings.

Web Configuration

D-Link DSL-2640B User Manual

56

Network Tools

Choose

ADVANCED

>

Network Tools

. The

NETWORK TOOLS

page as shown in the

figure appears.