ZyXEL Communications LTE3301-M209, Руководство пользователя, Страница: 104 / 189

LTE3301-M209 User’s Guide
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C
HAPTER
14
Firewall
14.1 Overview
Use these screens to enable and configure the firewall that protects your Zyxel Device and your LAN
from unwanted or malicious traffic.
Enable the firewall to protect your LAN computers from attacks by hackers on the Internet and control
access between the LAN and WAN. By default the firewall:
• allows traffic that originates from your LAN computers to go to all of the networks.
• blocks traffic that originates on the 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 71 Default Firewall Action
14.1.1 What You Can Do
• Use the General screen to enable or disable the Zyxel Device’s firewall ( Section 14.2 on page 105 ).
• Use the Services screen enable service blocking, enter/delete/modify the services you want to block
and the date/time you want to block them ( Section 14.3 on page 106 ).
14.1.2 What You Need To Know
The following terms and concepts may help as you read through this chapter.
About the Zyxel Device Firewall
The Zyxel Device’s firewall feature physically separates the LAN and the WAN and acts as a secure
gateway for all data passing between the networks.