NBG-419N v2 User’s Guide 153
CHAPTER 20
Firewall
20.1 Overview
This chapter shows you how to enable and configure the firewall that protects your Router 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 107 Default Firewall Action
20.2 What You Can Do
•Use the General (Section 20.4 on page 154) screen to enable or disable the Router’s firewall.
•Use the Services screen (Section 20.5 on page 155) screen enable service blocking, enter/
delete/modify the services you want to block and the date/time you want to block them.
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