Firewalls; Chapter 9 Firewalls; Overview; What You Can Do In The Firewall Screens - ZyXEL Communications P-660HW-Tx v3 User Manual

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H A P T E R

9.1 Overview

This chapter shows you how to enable and configure the ZyXEL Device firewall.
Use these screens to enable and configure the firewall that protects your ZyXEL
Device and network from attacks by hackers on the Internet and control access to
it. By default the firewall:
• allows traffic that originates from your LAN computers to go to all other
networks.
• blocks traffic that originates on other networks from going to the LAN.
The following figure illustrates the default firewall action. User A can initiate an IM
(Instant Messaging) session from the LAN to the WAN (1). Return traffic for this
session is also allowed (2). However other traffic initiated from the WAN is blocked
(3 and 4).
Figure 59 Default Firewall Action
LAN
A

9.1.1 What You Can Do in the Firewall Screens

• Use the General screen
firewall level on the ZyXEL Device.
• Use the Rules screen
rules and add, edit or remove a firewall rule when you set the firewall level as
Custom in the General screen.
P-660HW-Tx v3 User's Guide
WAN
1
2
(Section 9.2 on page
(Section 9.3 on page 189) to view the configured firewall
9

Firewalls

3
4
186) to enable firewall or set the
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