Firewall; Chapter 17 Firewall; Overview; What You Can Do In This Chapter - ZyXEL Communications EMG8726-B10A User Manual

17.1 Overview

This chapter shows you how to enable and configure the EMG's security settings. Use the firewall to
protect your EMG 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 120 Default Firewall Action

17.1.1 What You Can Do in this Chapter

• Use the General screen to configure the security level of the firewall on the EMG
page 186).
• Use the Protocol screen to add or remove predefined Internet services and configure firewall rules
(Section 17.3 on page
• Use the Access Control screen to view and configure incoming/outgoing filtering rules
on page
• Use the DoS screen to activate protection against Denial of Service (DoS) attacks
page 191).
187).
189).
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Firewall

(Section 17.2 on
(Section 17.4
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