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NBG-460N User’s Guide
179
CHAPTER 13
Firewall
13.1 Overview
Use the screens in this chapter to enable and configure the firewall that protects
your NBG-460N 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 121 Default Firewall Action
13.2 What You Can Do
•Use the General screen (Section 13.4 on page 182) to enable or disable the
NBG-460N’s firewall, and set up firewall logs.
WAN
LAN
Internet
3
4
1
2
A