What You Can Do; What You Need To Know; About The Nbg4604 Firewall - ZyXEL Communications NBG4604 User Manual

Chapter 13 Firewall

13.2 What You Can Do

• Use the General screen
NBG4604's firewall.
• Use the Access Control Rule
configured access control rules and add, edit or remove a rule.
• Use the Services screen
blocking, enter/delete/modify the services you want to block and the date/time
you want to block them.

13.3 What You Need To Know

The NBG4604'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 NBG4604 Firewall

The NBG4604 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 NBG4604's purpose
is to allow a private Local Area Network (LAN) to be securely connected to the
Internet. The NBG4604 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 NBG4604 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 NBG4604 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.
136
(Section 13.4 on page
(Section 13.5 on page
(Section 13.6 on page
137) to enable or disable the
137) screen to view the
140) screen enable service
NBG4604 User's Guide