ZyXEL Communications PMG2006-T20A, User Manual

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PMG2006-T20A User’s Guide
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C
HAPTER
12
Firewall
12.1 Overview
This chapter shows you how to enable and configure the PMG2006-T20A’s security settings. Use the
firewall to protect your PMG2006-T20A 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 60 Default Firewall Action
12.1.1 What You Can Do in this Chapter
• Use the General screen to configure the security level of the firewall on the PMG2006-T20A ( Section
12.2 on page 96 ).
• Use the Protocol screen to add or remove predefined Internet services and configure firewall rules
( Section 12.3 on page 97 ).
• Use the Access Control screen to view and configure incoming/outgoing filtering rules ( Section 12.4
on page 99 ).
• Use the DoS screen to activate protection against Denial of Service (DoS) attacks (. Section 12.5 on
page 101 ).