•Use the Services screen (Section 13.5 on page 127) screen enable service blocking, enter/ delete/modify the services you want to block and the date/time you want to block them.
13.3What You Need To Know
The NBG-417N’s firewall feature physically separates the LAN and the WAN and acts as a secure gateway for all data passing between the networks.
13.3.1 About the NBG-417N Firewall
The NBG-417N 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-417N's purpose is to allow a private Local Area Network (LAN) to be securely connected to the Internet. The NBG-417N 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-417N 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-417N 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.
13.4 General Firewall Screen
Use this screen to enable or disable the NBG-417N’s firewall, and set up firewall logs. Click Security > Firewall to open the General screen.
Figure 76 Security > Firewall > General
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