NBG6815 User’s Guide
130
CHAPTER 14
Security
14.1 Overview
Use these screens to enable and configure the firewall that protects your NBG6815 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 86 Default Firewall Action
14.1.1 What You Can Do
•Use the IPv4 Firewall screen to enable or disable the NBG6815’s IPv4 firewall (Section 14.2 on
page 131).
•Use the IPv6 Firewall screen to enable or disable the NBG6815’s IPv6 firewall (Section 14.3 on
page 133).
14.1.2 What You Need To Know
The following terms and concepts may help as you read through this chapter.
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