ZyXEL Communications WAH7130, User Manual

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Chapter 9 Firewall
WAH7130 User’s Guide
64
What is a Firewall?
Originally, the term “firewall” referred to a construction technique designed to prevent the spread of
fire from one room to another. The networking term "firewall" is a system or group of systems that
enforces an access-control policy between two networks. It may also be defined as a mechanism
used to protect a trusted network from a network that is not trusted.
Guidelines For Enhancing Security With Your Firewall
1
Change the default password via Web Configurator.
2
Don't enable any local service (such as NTP) that you don't use. Any enabled service could present
a potential security risk. A determined hacker might be able to find creative ways to misuse the
enabled services to access the firewall or the network.
3
Keep the firewall in a secured (locked) room.
9.2 General Screen
Use this screen to enable or disable the WAH7130’s firewall. Click Security > Firewall to open the
General screen.
Figure 35
Security > Firewall > General
The following table describes the labels in this screen.
9.3 Service Blocking Screen
You can use this screen to enable service blocking, enter/delete/modify the services you want to
block and the date/time you want to block them.
Click Security > Firewall > Service Blocking . The screen appears as shown next.
Table 29
Security > Firewall > General
LABEL DESCRIPTION
Enable Firewall Select this check box to activate the firewall. The WAH7130 performs access control and
protects against Denial of Service (DoS) attacks when the firewall is activated.
Apply Click Apply to save the settings.
Cancel Click Cancel to start configuring this screen again.