ZyXEL Communications NBG-417N User Manual
NBG-417N User’s Guide
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Firewall
13.1 Overview
Use these screens to enable and configure the firewall that protects your NBG-417N and your LAN
from unwanted or malicious traffic.
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:
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.
• 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).
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 75
Default Firewall Action
13.2 What You Can Do
• Use the General screen (
) to enable or disable the NBG-417N’s
firewall.