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Content Filtering 
Easily applied content filtering based on Mac Address, IP Address, URL 
and/or Domain Name. 
Filter Scheduling 
These filters can also be scheduled to be active on certain days or for a 
duration of hours or minutes. 
Network Address Translation 
NAT allows you to share a single IP Address and protects you from outside 
intruders gaining access to your private network. 
DHCP Server Supported 
All of the networked computers can retrieve TCP/IP settings automatically 
from the DI-604. 
Web-Based Management 
DI-604 is configurable through any network computer’s web browser using 
Netscape or Internet Explorer. 
Access Control Supported 
Allows you to assign different access rights for different users. 
Virtual Server Supported 
Enables you to expose WWW, FTP and other services on your LAN to be 
accessible to Internet users. 
Special Application Supported 
Special applications requiring multiple connections, like Internet gaming, 
video conferencing, Internet telephony and so on. The DI-604 can sense 
the application type and open a multi-port tunnel for it. 
DMZ Host Supported 
Allows a networked computer to be fully exposed to the Internet. This 
function is used when the Special Application feature is insufficient to allow 
an application to function correctly. 
Technology Introduction 
Introduction to Broadband Router Technology 
A router is a device that forwards data packets from a source to a 
destination. Routers forward data packets using IP addresses and not a 
MAC address. A router will forward data from the Internet to a particular 
computer on your LAN.   
The information that makes up the Internet gets moved around using 
routers. When you click on a link on a web page, you send a request to a