Firewall; Chapter 12 Firewall; Overview; What You Can Do In The Firewall Screens - ZyXEL Communications P-2612HW-F1 User Manual

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H A P T E R

12.1 Overview

Use the ZyXEL Device firewall 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 122 Default Firewall Action
LAN
A

12.1.1 What You Can Do in the Firewall Screens

• Use the General screen
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
rules and add, edit or remove a firewall rule.
P-2612HW-F1 User's Guide
WAN
1
2
(Section 12.2 on page
(Section 12.3 on page 238) to view the configured firewall
12

Firewall

3
4
236) to enable firewall and/or
231