D-Link DI-804HV - Express ENwork Router Manual - Introduction to Broadband

6

Features & Benefits continued

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Access Control supported

Allows you to assign different access rights for different users.

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Packet filter supported

Packet Filter allows you to control access to a network by analyzing the

incoming and outgoing packets and letting them pass or halting them

based on the IP address of the source and destination.

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Virtual Server supported

Enables you to expose WWW, FTP and other services on your LAN to be

accessible to Internet users.

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User-Definable Application Sensing Tunnel

You can define the attributes, for instance opening special ports to allow

packets to come through, to support special applications requiring multiple

connections, such as Internet gaming, video conferencing, and Internet

telephony. The DI-804HV can sense the application type and open a multi-

port tunnel for it.

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DMZ Host supported

Allows a networked computer to be fully exposed to the Internet; this

function is used when the special “application-sensing tunnel feature” is

insufficient to allow an application to function correctly.

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 resides on the Internet gets moved around using routers. When

you click on a link on a web page, you send a request to a server to show you the next

page. The information that is sent and received from your computer is moved from your

computer to the server using routers. A router also determines the best route that your

information should follow to ensure that the information is delivered properly.

A router controls the amount of data that is sent through your network by eliminating

information that should not be there. This provides security for the computers con-

nected to your router, because computers from the outside cannot access or send

information directly to any computer on your network. The router determines which

computer the information should be forwarded to and sends it. If the information is not

intended for any computer on your network, the data is discarded. This keeps any

unwanted or harmful information from accessing or damaging your network.