ZyXEL VMG1312-B10A User Guide - Page 207
Firewall
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CHAPTER 18 Firewall 18.1 Overview This chapter shows you how to enable and configure the Device's security settings. Use the firewall to protect 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 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 112 Default Firewall Action LAN 1 A 2 WAN 3 4 18.1.1 What You Can Do in this Chapter • Use the General screen to configure the security level of the firewall on the Device (Section 18.2 on page 208). • Use the Protocol screen to add or remove predefined Internet services and configure firewall rules (Section 18.3 on page 209). • Use the Access Control screen to view and configure incoming/outgoing filtering rules (Section 18.4 on page 212). • Use the DoS screen to activate protection against Denial of Service (DoS) attacks (.Section 18.5 on page 214). VMG1312-B Series User's Guide 207