Firewall; Chapter 10 Firewall; Overview; What You Can Do In The Firewall Screens - ZyXEL Communications P-660H-61 User Manual

10.1 Overview

This chapter shows you how to enable the ZyXEL Device firewall. Use the firewall to protect your
ZyXEL 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 ZyXEL 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 70 Default Firewall Action
LAN
A

10.1.1 What You Can Do in the Firewall Screens

• Use the Firewall screen
ZyXEL Device.
• Use the General screen
ZyXEL 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.
ADSL Router Series User's Guide
C
HAPTER
WAN
1
2
(Section 10.3 on page 167) to enable firewall and/or IPv6 firewall on the
(Section 10.3 on page 167) to select the firewall protection level on the
(Section 10.4 on page
(Section 10.5 on page 169) to view the configured firewall rules and add,
Firewall
3
4
168) to set the default action that the
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