ZyXEL Communications P-334U - Manual (Page 128)

P-334U/P-335U User’s Guide
128 Chapter 11 Firewall
The ZyXEL Device 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 ZyXEL 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.
11.1.4 Guidelines For Enhancing Security With Your Firewall
1 Change the default password via web configurator.
2 Think about access control before you connect to the network in any way, including
attaching a modem to the port.
3 Limit who can access your router.
4 Don't enable any local service (such as SNMP or 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.
5 For local services that are enabled, protect against misuse. Protect by configuring the
services to communicate only with specific peers, and protect by configuring rules to
block packets for the services at specific interfaces.
6 Protect against IP spoofing by making sure the firewall is active.
7 Keep the firewall in a secured (locked) room.
11.2 General Firewall Screen
Click Security > Firewall to open the General screen.
Figure 78 General