ZyXEL P-2812HNU-F1 User Guide - Page 199
Firewall
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CHAPTER 12 Firewall 12.1 Overview Use the Device firewall screens to enable and configure the firewall that protects 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 and WLAN computers to go to all other networks. • Blocks traffic that originates on other networks from going to the LAN and WLAN. 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 88 Default Firewall Action LAN 1 A 2 WAN 3 4 12.1.1 What You Can Do in this Chapter • Use the General screen to enable or disable the Device's firewall (Section 12.2 on page 200). • Use the Services screen to view the configured firewall rules and add, edit or remove a firewall rule (Section 12.3 on page 201). 12.1.2 What You Need to Know Firewall The Device's firewall feature physically separates the LAN/WLAN and the WAN and acts as a secure gateway for all data passing between the networks. It is designed to protect against Denial of Service (DoS) attacks when activated. The Device's purpose is to allow a private Local Area Network (LAN) to be securely connected to the Internet. P-2812HNU(L)-Fx Series User's Guide 199