6

prevent unauthorized Internet users from accessing private networks or

corporate LAN’s and Intranets.

A firewall watches all of the information moving to and from your

network and analyzes each piece of data. Each piece of data is checked

against a set of criteria that the administrator configures. If any data does not

meet the criteria, that data is blocked and discarded. If the data meets

the

criteria, the data is passed through. This method is called packet filtering.

A firewall can also run specific security functions based on the type of

application or type of port that is being used. For example, a firewall can be

configured to work with an FTP or Telnet server. Or a firewall can be

configured to work with specific UDP or TCP ports to allow certain

applications or games to work properly over the Internet.

Local Area Networking (LAN) is the term used when connecting

several computers together over a small area such as a building or group of

buildings. LAN’s can be connected over large areas. A collection of LAN’s

connected over a large area is called a Wide Area Network (WAN).

A LAN consists of multiple computers connected to each other. There

are many types of media that can connect computers together. The most

common media is CAT5 cable (UTP or STP twisted pair wire.) On the other

hand, wireless networks do not use wires; instead they communicate over

radio waves. Each computer must have a Network Interface Card (NIC),

which communicates the data between computers. A NIC is usually a

10Mbps network card, or 10/100Mbps network card, or a wireless network

card.

Most networks use hardware devices such as hubs or switches that

each cable can be connected to in order to continue the connection between

computers. A hub simply takes any data arriving through each port and

forwards the data to all other ports. A switch is more sophisticated, in that a

switch can determine the destination port for a specific piece of data.

A

switch minimizes network traffic overhead and speeds up the communication

over a network.

Networks take some time in order to plan and implement correctly.

There are many ways to configure your network.

You may want to take

some time to determine the best network set-up for your needs.

Virtual Private Networking (VPN) uses a publicly wired network (the

Internet) to securely connect two different networks as if they were the same

network. For example, an employee can access the corporate network from

home using VPN, allowing the employee to access files and printers. Here

are several different implementations of VPN that can be used.

PPTP uses proprietary means of connecting two private networks over the

Internet. PPTP is a way of securing the information that is communicated

between networks. PPTP secures information by encrypting the data inside

of a packet

.

IPSec provides a more secure network-to-network connection across the

Internet or a Wide Area Network (WAN). IPSec encrypts all communication

between the client and server whereas PPTP only encrypts the data packets.

Both of these VPN implementations are used because there is not a

standard for VPN server software. Because of this, each ISP or business

can implement its own VPN network making interoperability a challenge.

WAN & LAN

Ethernet port indicators, Green. The LED flickers when the

LAN or WAN port is sending or receiving data.

Link/Act.

Link status indicators, Green. The LED flickers when the

corresponding port is sending or receiving data

8

Getting Started

The

Infrastructure Network

example shown contains the following D-Link

network devices:

Express Ethernetwork

TM

Broadband Router -

D-Link DI-604

A laptop computer with an Ethernet adapter -

D-Link DFE-670TXD

A desktop computer with an Ethernet adapter -

D-Link DFE-530TX+

A Cable modem -

D-Link DCM-200

The DI-604 provides Web based configuration. You can configure your

DI-604 through your Netscape Communicator or Internet Explorer

browser in MS Windows, Macintosh or UNIX based platforms.

Activate your browser. Then type the IP address of the DI-604 into the

Location

(for Netscape) or

Address

(for IE) field and press “

Enter

.” For

example:

.

(The IP Address shown in the example above is the default setting. If you have changed the

IP Address of the DI-604 to conform to a network, then input that IP Address in the web

browser, instead of the default IP Address shown.)

This screen will appear.

Click

Run Wizard

.

The

Setup Wizard

screen

will appear. Follow the

Wizard step by step to

quickly configure the

DI-604.

Click

Next

Open the web browser

Type in the

IP Address

of

the DI-604

Type

admin

in the

User Name

field

(lower case)

Leave the

Password

blank

Click

OK

http://192.168.0.1

admin

10

It is recommended that

you change the admin

password for security

purposes. Enter in your

new password. Enter it in

a second time for

verification.

Click Next

In the window below, select the method you use to connect to the Internet.

This is called the WAN connection or WAN Type.

Static IP Address:

Select this option to

manually input the IP

address that your ISP

assigned to you.

(

Please see

Assigning

a Static IP Address

in

the

Troubleshooting

section of this manual

.)

Dynamic IP Address:

(e.g., Cable users)

Select this option to obtain an IP address automatically from your ISP.

Please see Dynamic IP Address section.

Dynamic IP Address with Road Runner Session Management:

(e.g.,

Telstra BigPond users)

Choose this option if it is required by your ISP

PPP over Ethernet (PPPoE)

:

(e.g., DSL users) Select this option if your ISP

requires the use of PPPoE to connect to their services.

Please see PPPoE

section.

PPTP:

Select this option if your ISP requires it

Once you have made the appropriate selection, click

Next

.