ProSafe Quad WAN Gigabit Firewall FR538G Reference Manual
D-6
Network Planning for Quad WAN Ports
v1.0, November 2007
Overview of the Planning Process
The areas that require planning when using a firewall that has quad WAN ports include:
•
Inbound traffic (for example, port forwarding, port triggering, DMZ port)
The four WAN ports can be configured on a mutually-exclusive basis to either:
•
Rollover for increased reliability, or
•
Balance the load for outgoing traffic.
These two categories of considerations interact to make the planning process more challenging.
Inbound Traffic
Unrequested incoming traffic can be directed to a PC on your LAN rather than being discarded.
The mechanism for making the IP address public depends on whether the quad WAN ports are
configured to either roll over or balance the loads. See
for further
discussion.
The Roll-over Case for Firewalls With Quad WAN Ports
) for the quad WAN port case is different from the single gateway WAN port
case when specifying the IP address. Only one WAN port is active at a time and when it rolls over,
the IP address of the active WAN port always changes. Hence, the use of a fully-qualified domain
name is always required, even when the IP address of each WAN port is fixed.
Features such as multiple exposed hosts are not supported when using quad WAN port rollover
because the IP addresses of each WAN port must be in the identical range of fixed addresses.
Figure D-2
Summary of Contents for ProSafe Quad WAN FR538G
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