ZyXEL nbg-4615 用户指南
NBG4615 User’s Guide
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Firewall
23.1 Overview
Use these screens to enable and configure the firewall that protects your NBG4615
and your LAN from unwanted or malicious traffic.
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:
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).
(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
23.1.1 What You Can Do
• Use the General screen to enable or disable the NBG4615’s firewall (
WAN
LAN
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