Nortel BSR252, Configuration - Basics

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Chapter 10 Firewalls 155
Nortel Business Secure Router 252 Configuration — Basics
Introduction to the Business Secure Router firewall
The Business Secure Router firewall is a stateful inspection firewall is designed to
protect against Denial of Service attacks when activated (in SMT menu 21.2 or in
the WebGUI). The Business Secure Router allows a private Local Area Network
(LAN) to be securely connected to the Internet. The Business Secure Router can
be used to prevent theft, destruction, and modification of data, as well as log
events, which is important to the security of your network. The Business Secure
Router also has packet filtering capabilities.
The Business Secure Router is installed between the LAN and a broadband
modem connecting to the Internet, so that it can allow it to act as a secure gateway
for all data passing between the Internet and the LAN.
The Business Secure Router has one ADSL 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 modem
(cable or ADSL) connecting to the Internet.
• The LAN (Local Area Network) port attaches to a network of computers,
which needs security from the outside world. These computers have access to
Internet services such as e-mail, FTP, and the World Wide Web. However,
inbound access is not allowed unless the remote host is authorized to use a
specific service.