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12.3 What You Need To Know
The NBG-418N v2's firewall feature physically separates the LAN and the WAN and acts as a secure
gateway for all data passing between the networks.
12.3.1 About the NBG-418N v2 Firewall
The NBG-418N v2 firewall is a stateful inspection firewall and is designed to protect against Denial
of Service attacks when activated (click the General tab under Firewall and then click the Enable
Firewall check box). The NBG-418N v2's purpose is to allow a private Local Area Network (LAN) to
be securely connected to the Internet. The NBG-418N v2 can be used to prevent theft, destruction
and modification of data, as well as log events, which may be important to the security of your
network.
The NBG-418N v2 is installed between the LAN and a broadband modem connecting to the
Internet. This allows it to act as a secure gateway for all data passing between the Internet and the
LAN.
The NBG-418N v2 has one Ethernet WAN port and four Ethernet LAN ports, which are used to
physically separate the network into two areas.The WAN (Wide Area Network) port attaches to the
broadband (cable or DSL) modem to the Internet.
The LAN (Local Area Network) port attaches to a network of computers, which needs security from
the outside world. These computers will have access to Internet services such as e-mail, FTP and
the World Wide Web. However, "inbound access" is not allowed (by default) unless the remote host
is authorized to use a specific service.
12.3.2 VPN Pass Through Features
A Virtual Private Network (VPN) is a way to securely connect two networks over the Internet. For
example a home network and one in a business office. This requires special equipment on both
ends of the connection.
The NBG-418N v2 is not one of the endpoints but it does allow traffic from those endpoints to pass
through. The NBG-418N v2 allows the following types of VPN traffic to pass through:
• IP security (IPSec)
• Point-to-Point Tunneling Protocol (PPTP)
12.4 General Firewall Screen
Use this screen to enable or disable the NBG-418N v2's firewall, and set up firewall logs. Click
Security > Firewall to open the General screen.
Chapter 12 Firewall
NBG-418N v2 User's Guide
112
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