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Network Planning Guide for ProSafe VPN Firewall Router FVX538
Network Planning 2-5
October 2004
Figure 2-5: Dual WAN port case for exposed host with load balancing
Multiple Exposed Hosts
The IP address range of the router’s WAN port must be both fixed and public so that the public can
send incoming traffic to the multiple exposed hosts when this feature is supported and enabled.
Multiple Exposed Hosts: Single WAN Port (Reference Case)
In the single WAN case (Figure 2-6), the WAN port’s IP address range must be fixed.
Figure 2-6: Single WAN port case with multiple exposed hosts
Multiple Exposed Hosts: Dual WAN Ports for Improved System Reliability
Using multiple exposed hosts with routers that have dual WAN ports for improved system
reliability is a disallowed combination because to do so, the IP addresses of each WAN port would
have to be the identical range of fixed addresses. Instead, use additional routers that have dual
WAN ports with a single exposed host for improved system reliability.
Multiple Exposed Hosts: Dual WAN Ports for Load Balancing
In the dual WAN port case for load balancing (Figure 2-7), the IP address range of each WAN port
must be fixed.
Router
netgear1.dyndns.org
WAN1 IP
Dual WAN Ports (Load Balancing)
WAN2 IP
netgear2.dyndns.org
IPaddresses ofWAN ports:
useof fully-qualifieddomain names
requiredfordynamic IPaddresses
andoptional forfixedIPaddresses
exposedhost
Router
22.23.24.25
22.23.24.26
...
WAN IPs
Single WAN Port
IPaddresses ofWAN portmust bea fixedblock
exposedhosts