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DSL-502G ADSL Router User's Guide
DMZ IP Address
NAT may conflict with certain interactive applications such as video conferencing or playing Internet video
games. For these applications, a NAT 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 NAT 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.
For example, if you want to use video conferencing and still use NAT, 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
typing in the IP address in the DMZ IP Address space provided and clicking the OK button.
Port Redirection
Figure 20. Port Redirection Add Menu
The Port Redirection feature of the Router is used in conjunction with NAT to improve security and efficiency.
Port redirection can be used to direct potentially hazardous packets to a proxy server outside your firewall. For
example, it is common practice to direct HTTP packets to a designated HTTP server in the DMZ. Other common
applications might include directing incoming SMTP packets to an Email server for data scrutiny and improved
network efficiency. Click the Add button in the Port Redirection window to access the Redirect Port - Add menu.
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