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Network Planning Guide for ProSafe VPN Firewall Router FVX538
Network Planning 2-7
October 2004
For the single gateway WAN port case, the mechanism is to use a fully-qualified domain name
(FQDN) when the IP address is dynamic and to use either an FQDN or the IP address itself when
the IP address is fixed. The situation is different when dual gateway WAN ports are used in a
failover-based system.
• Failover Case for Dual Gateway WAN Ports
Failover (Figure 2-8) for the dual gateway WAN port case is different from the single gateway
WAN port case when specifying the IP address of the VPN tunnel end point. Only one WAN
port is active at a time and when it fails 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.
Figure 2-8: Dual gateway WAN ports before and after failover
• Load Balancing Case for Dual Gateway WAN Ports
Load balancing (Figure 2-9) for the dual gateway WAN port case is the same as the single
gateway WAN port case when specifying the IP address of the VPN tunnel end point. 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.
Figure 2-9: Dual gateway WAN ports for load balancing
Note: Once the gateway router WAN port fails over, the VPN tunnel collapses and must
be re-established using the new WAN IP address.
Gateway
netgear.dyndns.org
WAN1 IP
Dual WAN Ports (Before Failover)
VPN Router
WAN2 IP (N/A)
WAN2 port inactive
Gateway
WAN1 port inactive
WAN1 IP (N/A)
Dual WAN Ports (After Failover)
VPN Router
WAN2 IP
netgear.dyndns.org
IPaddress ofactiveWANport changesafter afailover(useof fully-qualifieddomain namesalwaysrequired)
XX
XX
Gateway
netgear1.dyndns.org
WAN1 IP
Dual WAN Ports (Load Balancing)
VPN Router
WAN2 IP
netgear2.dyndns.org
IPaddresses ofWAN ports sameassingle
WANport case(use offully-qualified domain
namesrequired fordynamicIP addresses
andoptional forfixedIPaddresses)