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ProSafe Quad WAN Gigabit Firewall FR538G Reference Manual
Network Planning for Quad WAN Ports D-7
v1.0, November 2007
The Load Balancing Case for Firewalls With Quad WAN Ports
Load balancing ( Figure D-3 ) for the quad WAN port case is similar to the single WAN port case
when specifying the IP address. Each IP address is either fixed or dynamic based on the ISP: fully-
qualified domain names must be used when the IP address is dynamic and are optional when the IP
address is static.
Inbound Traffic
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 that you have configured in the Inbound Rules
menu. Instead of discarding this traffic, you can have it forwarded to one or more LAN hosts on
your network.
The addressing of the firewall’s quad WAN port depends on the configuration being implemented:
Inbound Traffic to Single WAN Port (Reference Case)
The Internet IP address of the firewall’s WAN port must be known to the public so that the public
can send incoming traffic to the exposed host when this feature is supported and enabled.
Figure D-3
Table D-1. IP addressing requirements for exposed hosts in quad WAN port systems
Configuration and
WAN IP address Single WAN Port
(reference case)
Quad WAN Port Cases
Rollover Load Balancing
Inbound traffic
• Port forwarding
• Port triggering
• DMZ port Fixed Allowed
(FQDN optional) FQDN required Allowed
(FQDN optional)
Dynamic FQDN required FQDN required FQDN required