D-Link 502G User Guide - Page 51

DMZ IP Address, Port Redirection - nat

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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. 39

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DSL-502G ADSL Router User’s Guide
39
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.