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P-2612HNU-Fx User’s Guide
203
CHAPTER 14
Firewall
14.1 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 69 Default Firewall Action
14.1.1 What You Can Do in the Firewall Screens
Use the Firewall screen (Section 14.2 on page 204) to enable LAN-to-WAN
services blocking on the ZyXEL Device.
14.1.2 What You Need to Know About Firewall
The following terms and concepts may help as you read this chapter.
WAN
LAN
3
4
1
2
A