ZyXEL Communications ZyXEL ZyAIR 100 - Manual (Page 40)

ZyWALL 10~100 Series Internet Security Gateway
1-8 Getting to Know Your ZyWALL
1.2.4 ZyWALL 100 Note
The ZyWALL 100 is designed to act as a secure gateway for all data passing between the Internet and the
LAN or the DMZ. It has three Ethernet ports, one RS-232 auxiliary port and one PCMCIA port (for optional
wireless applications), which are used to physically separate the network into three areas.
I. LAN Network (a trusted network)
LAN port: The auto-negotiating 10/100 Mbps Ethernet LAN interface automatically
detects if it’s on a 10 or a 100 Mbps Ethernet. Attach computers that are to be secured from the
outside world to this port. These computers will have access to e-mail, FTP and the World Wide
Web but incoming connections (from the Internet) are only allowed if the connection is originally
initiated from the LAN computer or a firewall rule has been specifically configured to allow access.
II. DMZ Network
DMZ port: Attach public servers (Web, FTP, etc.) to the DeMilitarized Zone (DMZ) port.
Computers attached to this port are visible to the outside world (while still being protected from
DoS (Denial of Service) attacks such as SYN flooding and Ping of Death) and can also be accessed
from the secure LAN.
III. WAN Network
WAN port: The 10/100 Mbps Ethernet WAN port attaches to the Internet via broadband modem or
router.
Dial Backup port: This auxiliary port can be used as a backup line when/if the broadband
connection to the WAN port fails.
1.3 Applications for the ZyWALL
Here are some examples of what you can do with your ZyWALL.
1.3.1 Secure Broadband Internet Access via Cable or DSL Modem
You can connect a cable modem, DSL or wireless modem to the ZyWALL for broadband Internet access via
Ethernet or wireless port on the modem. The ZyWALL guarantees not only high speed Internet access, but
secure internal network protection and traffic management as well.