User's Manual

P-660HW-Tx v3 Series User’s Guide

189

CHAPTER 10

Firewalls

10.1 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 76 Default Firewall Action

10.1.1 What You Can Do in the Firewall Screens

•Use the General screen (Section 10.2 on page 194) to enable firewall and/or

triangle route on the ZyXEL Device, and set the default action that the firewall

takes on packets that do not match any of the firewall rules.

•Use the Rules screen (Section 10.3 on page 196) to view the configured firewall

rules and add, edit or remove a firewall rule.

WAN

LAN