Firewall, 1 overview, Chapter 13 firewall – ZyXEL Communications NBG-417N User Manual
Page 135
NBG-417N User’s Guide
135
C
H A P T E R
13
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.
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 75 Default Firewall Action
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