ZyXEL P-2601HNL-F1 User Guide - Page 159
Firewall, 13.1 Overview, 13.1.1 What You Can Do in
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CHAPTER 13 Firewall 13.1 Overview Use the ZyXEL Device firewall screens to enable and configure the firewall that protects 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 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 71 Default Firewall Action LAN 1 A 2 WAN 3 4 13.1.1 What You Can Do in this Chapter • Use the General screen to enable or disable the ZyXEL Device's firewall (Section 13.2 on page 161). • Use the Services screen to configure LAN-to-WAN services blocking on the ZyXEL Device (Section 13.3 on page 161). P-2601HN(L)-F1 Series User's Guide 159