Firewall; Chapter 10 Firewall; Overview; What You Can Do In This Chapter - ZyXEL Communications P-660HN-51 - V1.10 Manual

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H A P T E R

10.1 Overview

This chapter shows you how to enable and configure 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. 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 57 Default Firewall Action
LAN
A

10.1.1 What You Can Do in this Chapter

• Use the Firewall screen to configure the security level of the firewall on the
ZyXEL Device
• Use the Protocol screen to add or remove predefined Internet services and
configure firewall rules
• Use the Access Control screen to view and configure incoming/outgoing
filtering rules
P-660HN-51 User's Guide
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(Section 10.2 on page
(Section 10.3 on page
(Section 10.4 on page 157).

Firewall

WAN
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