ZyXEL Communications NBG6503 User Manual

Chapter 17 Firewall

NBG6503 User’s Guide

The Router’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 Router's purpose is to 
allow a private Local Area Network (LAN) to be securely connected to the Internet. The Router 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 Router 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 Router 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.

Use this screen to enable or disable the Router’s firewall, and set up firewall logs. Click Security > 
Firewall to open the General screen.

Figure 91   Security > Firewall > General 

The following table describes the labels in this screen.

Table 55   Security > Firewall > General 

Enable Firewall

Select this check box to activate the firewall. The Router performs access control and 
protects against Denial of Service (DoS) attacks when the firewall is activated.

Apply

Click Apply to save the settings. 

Reset

Click Reset to start configuring this screen again.