Operation Manual

NBG6515 User’s Guide
127
CHAPTER 19
Firewall
19.1 Overview
This chapter shows you how to enable and configure the firewall that protects your NBG 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 96 Default Firewall Action
19.2 What You Can Do
•Use the General (Section 19.4 on page 128) screen to enable or disable the NBG’s firewall.
•Use the MAC Filtering Rule screen (Section 19.5 on page 129) to configure the NBG to block
access to devices or block the devices from accessing the NBG.
•Use the IP Filtering Rule screen (Section 19.6 on page 130) to configure the NBG to block
access to devices or block the devices from accessing the NBG.