Security; Chapter 13 Security; Overview; What You Can Do - ZyXEL Communications NBG6604 User Manual

13.1 Overview

Use these screens to enable and configure the firewall that protects your NBG6604 and your LAN from
unwanted or malicious traffic.
Enable the firewall to protect your LAN computers from attacks by hackers on the Internet and control
access between the LAN and WAN. By default the firewall:
• Allows traffic that originates from your LAN computers to go to all of the networks.
• Blocks traffic that originates on the 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 55 Default Firewall Action

13.1.1 What You Can Do

• Use the IPv4 Firewall screen to enable or disable the NBG6604's IPv4 firewall
89).
LAN
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Security

WAN
Internet
(Section 13.2 on page
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