User Manual

NBG-418N v2 User’s Guide
116
C HAPTER 13
Fire wa ll
13.1 Ove rvie w
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).
Fig ure 84 Default Firewall Action
13.2 Wha t You Ca n Do
• Use the Ge nera l screen to enable or disable the NBG-418N v2’s firewall (
Section 13.4 on page 117).
• Use the Se rvic e s screen to enable or disable ICMP and VPN passthrough features (
Section 13.5 on
page 118
).