The General Screen - ZyXEL Communications P-2812HNU-51c User Manual

Chapter 12 Firewall
The Device 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 Device is installed between the LAN/WLAN 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 Device 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.
ICMP
Internet Control Message Protocol (ICMP) is a message control and error-reporting protocol
between a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP) datagrams,
but the messages are processed by the TCP/IP software and directly apparent to the application
user.
Finding Out More
See Section 12.4 on page 202

12.2 The General Screen

Use this screen to enable or disable the Device's firewall. Click Security > Firewall to open the
General screen.
Figure 89 Security > Firewall > General
The following table describes the labels in this screen.
Table 51 Security > Firewall > General
LABEL
Firewall
Apply
Cancel
200
for advanced technical information on firewall.
DESCRIPTION
Select Enable to activate the firewall. The Device performs access control and
protects against Denial of Service (DoS) attacks when the firewall is activated.
Click Apply to save your changes.
Click Cancel to restore your previously saved settings.
P-2812HNU(L)-Fx Series User's Guide