ZyXEL P-2302R Bedienungsanleitung PDF herunterladen (Seite 147)

P-2302R Series User’s Guide

Chapter 14 Firewall 146

CHAPTER 14

Firewall

This chapter gives some background information on firewalls and explains how to get started

with the Prestige firewall.

14.1 Firewall Introduction

Originally, the term firewall referred to a construction technique designed to prevent the

spread of fire from one room to another. The networking term "firewall" is a system or group

of systems that enforces an access-control policy between two networks. It may also be

defined as a mechanism used to protect a trusted network from an untrusted network. Of

course, firewalls cannot solve every security problem. A firewall is one of the mechanisms

used to establish a network security perimeter in support of a network security policy. It

should never be the only mechanism or method employed. For a firewall to guard effectively,

you must design and deploy it appropriately. This requires integrating the firewall into a broad

information-security policy. In addition, specific policies must be implemented within the

firewall itself.

14.1.1 Stateful Inspection Firewall.

Stateful inspection firewalls restrict access by screening data packets against defined access

rules. They make access control decisions based on IP address and protocol. They also

"inspect" the session data to assure the integrity of the connection and to adapt to dynamic

protocols. These firewalls generally provide the best speed and transparency; however, they

may lack the granular application level access control or caching that some proxies support.

Firewalls, of one type or another, have become an integral part of standard security solutions

for enterprises.

14.1.2 About the Prestige Firewall

The Prestige firewall is a stateful inspection firewall and is designed to protect against Denial

of Service attacks when activated (click FIREWALL and then click the Enable Firewall

check box). The Prestige's purpose is to allow a private Local Area Network (LAN) to be

securely connected to the Internet. The Prestige can be used to prevent theft, destruction and

modification of data, as well as log events, which may be important to the security of your

network.

The Prestige is installed between the LAN and a broadband modem connecting to the Internet.

This allows it to act as a secure gateway for all data passing between the Internet and the LAN.

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