P-662H/HW-D Series User’s Guide
Chapter 10 Firewalls
169
C
H A P T E R
10
Firewalls
This chapter gives some background information on firewalls and introduces the ZyXEL
Device firewall.
10.1 Firewall Overview
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.
to configure default firewall settings.
to view firewall rules.
to configure a custom service.
to configure firewall thresholds.
10.2 Types of Firewalls
There are three main types of firewalls:
• Packet Filtering Firewalls
• Application-level Firewalls
• Stateful Inspection Firewalls
10.2.1 Packet Filtering Firewalls
Packet filtering firewalls restrict access based on the source/destination computer network
address of a packet and the type of application.
Содержание 802.11g ADSL 2+ 4-Port Security Gateway HW-D Series
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Страница 238: ...P 662H HW D Series User s Guide 238 Chapter 15 Introduction to IPSec ...
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Страница 372: ...P 662H HW D Series User s Guide 372 Appendix C Wall mounting Instructions ...
Страница 408: ...P 662H HW D Series User s Guide 408 Appendix F Wireless LANs ...
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Страница 436: ...P 662H HW D Series User s Guide 436 Appendix L NetBIOS Filter Commands ...
Страница 462: ...P 662H HW D Series User s Guide 462 Appendix M Internal SPTGEN ...
Страница 484: ...P 662H HW D Series User s Guide 484 Appendix P Triangle Route ...