User manual

Section 3 – Configuration
D-Link DSL-2740R User Manual
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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. Tick the Enable Firewall check box, and click the Apply
Settings button to active the function.