What You Need To Know; General Firewall Screen - ZyXEL Communications NBG-419N User Manual

Chapter 19 Firewall

19.3 What You Need To Know

The NBG-419N's firewall feature physically separates the LAN and the WAN and acts as a secure
gateway for all data passing between the networks.
It is designed to protect against Denial of Service (DoS) attacks when activated (click the General
tab under Firewall and then click the Enable Firewall check box). The NBG-419N's purpose is to
allow a private Local Area Network (LAN) to be securely connected to the Internet. The NBG-419N
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-419N 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-419N 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.

19.4 General Firewall Screen

Use this screen to enable or disable the NBG-419N's firewall, and set up firewall logs. Click
Security > Firewall to open the General screen.
Figure 103 Security > Firewall > General
The following table describes the labels in this screen.
Table 64 Security > Firewall > General
LABEL
Enable Firewall
Apply
Reset
140
DESCRIPTION
Select this check box to activate the firewall. The NBG-419N performs access
control and protects against Denial of Service (DoS) attacks when the firewall is
activated.
Click Apply to save the settings.
Click Reset to start configuring this screen again.
NBG-419N User's Guide