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Intrusion detection and prevention

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Appendixes

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Appendix A: ICMP Types and Codes

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Appendix B: Common IP Protocol Numbers

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LIMITED WARRANTY

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Introduction

The DFL-200 provides three 10/100M Ethernet network interface ports, which are (1)

Internal/LAN, (1) External/WAN, and (1) DMZ port. It also provides easily operated software

WebUI that allows users to set system parameters or monitor network activities using a web

browser.

Features and Benefits

z

Firewall Security

z

VPN Server/Client Supported

z

Content Filtering

z

Web Management

Configurable through any networked computer’s web browser using

Netscape or Internet Explorer.

z

Access Control supported

Allows you to assign different access rights for different users. Like

Admin or Read-Only User.

Introduction to Firewalls

A firewall is a device that sits between your computer and the Internet that prevents

unauthorized access to or from your network. A firewall can be a computer using firewall

software or a special piece of hardware built specifically to act as a firewall. In most

circumstances, a firewall is used to 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.

8

Introduction to Local Area Networking

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, a

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.

LEDs

Power:

A solid light indicates a proper connection to the power supply.

Status:

System status indicators, flashes to indicate an active system. If the LED has a

solid light the unit is defective.

WAN, DMZ & LAN ports:

Ethernet port indicators, Green. The LED flickers when the

ports are sending or receiving data.

Physical Connections

Console:

Serial access to the firewall software, 9600, 8bit, None Parity, 1Stop bit.

Internal Ports (LAN):

Use these ports to connect the internal computers f the office.

DMZ Port:

Use this port to connect to the company’s server(s), which needs direct

connection to the Internet (FTP, SNMP, HTTP and DNS).

External Port (WAN):

Use this port to connect to the external router, DSL modem, or

Cable modem.

Reset:

Reset the DFL-200 to the original default settings.

DC Power:

connect one end of the power supply to this port, the other end to the

electrical wall outlet.

10

Package Contents

Contents of Package:

•

D-Link DFL-200 Firewall

•

Manual and CD

•

Quick Installation Guide

•

AC Power adapter

Note: Using a power supply with a different voltage rating than the one included

with the DFL-200 will cause damage and void the warranty for this product.

If any of the above items are missing, please contact your reseller.

System Requirements

•

Computer with a Windows, Macintosh, or Unix based operating system with an

installed Ethernet adapter

•

Internet Explorer or Netscape Navigator, version 6.0 or above, with JavaScript

enabled.