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Page 56 / 91 Scroll up to view Page 51 - 55
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.
Page 57 / 91
Web Configuration
D-Link DSL-2640B User Manual
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.
Page 58 / 91
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.
Page 59 / 91
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.
Page 60 / 91
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.

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