Firewall; Chapter 12 Firewall; Overview; What You Can Do In This Chapter - ZyXEL Communications P-2812HNU-51c User Manual

12.1 Overview

Use the Device firewall screens to enable and configure the firewall that protects your 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 and WLAN computers to go to all other networks.
• Blocks traffic that originates on other networks from going to the LAN and WLAN.
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 88 Default Firewall Action
LAN
A

12.1.1 What You Can Do in this Chapter

• Use the General screen to enable or disable the Device's firewall
• Use the Services screen to view the configured firewall rules and add, edit or remove a firewall
rule (Section 12.3 on page

12.1.2 What You Need to Know

Firewall

The Device's firewall feature physically separates the LAN/WLAN and the WAN and acts as a secure
gateway for all data passing between the networks.
It is designed to protect against Denial of Service (DoS) attacks when activated. The Device's
purpose is to allow a private Local Area Network (LAN) to be securely connected to the Internet.
P-2812HNU(L)-Fx Series User's Guide
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H A P T E R
WAN
1
2
201).
Firewall
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4
(Section 12.2 on page
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