Operation Manual

NBG-418N v2 User’s Guide
117
CHAPTER 13
Firewall
13.1 Overview
Use these screens to enable and configure the firewall that protects your NBG-418N v2 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 84 Default Firewall Action
13.2 What You Can Do
•Use the General screen to enable or disable the NBG-418N v2’s firewall (Section 13.4 on page
118).
•Use the Services screen to enable or disable ICMP and VPN passthrough features (Section 13.5
on page 119).