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DSL-504 ADSL Router User’s Guide

If your network uses web servers, FTP servers or other proxies used for data

requests from outside the private network, you can use NAT in conjunction with

Port Redirection to allow appropriate use of your servers by outside users. See

the section on Port Redirection for more information.

For the purposes of network administration, NAT is almost indispensable. Hosts

and servers on the internal network can be moved easily. Using NAT together

with DHCP can greatly reduce the workload of a network manager while

allowing tremendous flexibility.

NAT Configuration Window

The NAT function is enabled by default on the Router. If you want to disable

NAT, open the NAT Configuration window, select disabled in the NAT Function

pull-down menu. Click the OK button to implement your choice. There are

security risks associated with disabling NAT, so it is important that you have

other network protection mechanisms in place before you do this.

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.