ProSafe Quad WAN Gigabit Firewall FR538G Reference Manual
Introduction
1-3
v1.0, November 2007
•
PCs Hidden by NAT
. NAT opens a temporary path to the Internet for requests originating
from the local network. Requests originating from outside the LAN are discarded, preventing
users outside the LAN from finding and directly accessing the PCs on the LAN.
•
Port Forwarding with NAT.
Although NAT prevents Internet locations from directly
accessing the PCs on the LAN, the firewall allows you to direct incoming traffic to specific
PCs based on the service port number of the incoming request. You can specify forwarding of
single ports or ranges of ports.
•
DMZ port
. Incoming traffic from the Internet is normally discarded by the firewall unless the
traffic is a response to one of your local computers or a service for which you have configured
an inbound rule. Instead of discarding this traffic, you can have it forwarded to one computer
on your network.
Autosensing Ethernet Connections with Auto Uplink
With its internal 4-port 10/100/1000 switch, the FR538G can connect to a 10 Mbps standard
Ethernet network, or either a 100 Mbps or 1G Fast Ethernet network. Both the LAN and WAN
interfaces are autosensing and capable of full-duplex or half-duplex operation.
The firewall incorporates Auto Uplink
TM
technology. Each Ethernet port will automatically sense
whether the Ethernet cable plugged into the port should have a ‘normal’ connection such as to a
PC or an “uplink” connection such as to a switch or hub. That port will then configure itself to the
correct configuration. This feature also eliminates the need to worry about crossover cables, as
Auto Uplink will accommodate either type of cable to make the right connection.
Extensive Protocol Support
The quad WAN gigabit firewall supports the Transmission Control Protocol/Internet Protocol
(TCP/IP) and Routing Information Protocol (RIP). For further information about TCP/IP, refer
to
“Internet Configuration Requirements” in Appendix D
.”
•
IP Address Sharing by NAT
. The quad WAN gigabit firewall allows several networked PCs
to share an Internet account using only a single IP address, which may be statically or
dynamically assigned by your Internet service provider (ISP). This technique, known as NAT,
allows the use of an inexpensive single-user ISP account.
•
Automatic Configuration of Attached PCs by DHCP
. The quad WAN gigabit firewall
dynamically assigns network configuration information, including IP, gateway, and domain
name server (DNS) addresses, to attached PCs on the LAN using the Dynamic Host
Configuration Protocol (DHCP). This feature greatly simplifies configuration of PCs on your
local network.
Summary of Contents for ProSafe Quad WAN FR538G
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