Firewall; Chapter 14 Firewall; Overview; What You Can Do In The Firewall Screens - ZyXEL Communications AMG1312-T10D User Manual

14.1 Overview

This chapter shows you how to enable the Device firewall. Use the firewall to protect your Device
and network from attacks by hackers on the Internet and control access to it. 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.
• blocks SYN and port scanner attacks.
By default, the Device blocks DDOS, LAND and Ping of Death attacks whether the firewall is enabled
or disabled.
The following figure illustrates the 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 98 Default Firewall Action
LAN
A

14.1.1 What You Can Do in the Firewall Screens

• Use the General screen
Device.
• Use the Default Action screen
firewall takes on packets that do not match any of the firewall rules.
• Use the Rules screen
edit or remove a firewall rule.
AMG1312-T10D User's Guide
C
HAPTER
WAN
1
2
(Section 14.2 on page 141) to select the firewall protection level on the
(Section 14.3 on page
(Section 14.4 on page 143) to view the configured firewall rules and add,

Firewall

3
4
142) to set the default action that the
1 4
139