Netgear SRX5308 Specifications Page 317

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Network Planning for Multiple WAN Ports
317
ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308
Dual-gateway WAN ports for load balancing
VPN Gateway-to-Gateway: Single Gateway WAN Ports (Reference Case)
In a configuration with two single WAN port gateways, either gateway WAN port can initiate
the VPN tunnel with the other gateway WAN port because the IP addresses are known in
advance.
Figure 194.
The IP address of the gateway WAN ports can be either fixed or dynamic. If an IP address is
dynamic, you need to use an FQDN. If an IP address is fixed, an FQDN is optional.
VPN Gateway-to-Gateway: Dual Gateway WAN Ports for Improved Reliability
In a configuration with two dual WAN port VPN gateways that function in auto-rollover mode,
either of the gateway WAN ports at one end can initiate the VPN tunnel with the appropriate
gateway WAN port at the other end as necessary to balance the loads of the gateway WAN
ports because the IP addresses of the WAN ports are known in advance. In this example
(see the following figure), port WAN_A1 is active and port WAN_A2 is inactive at Gateway A;
port WAN_B1 is active and port WAN_B2 is inactive at Gateway B.
Figure 195.
The IP addresses of the gateway WAN ports can be either fixed or dynamic, but you always
need to use an FQDN because the active WAN ports could be either WAN_A1, WAN_A2,
WAN_B1, or WAN_B2 (that is, the IP address of the active WAN ports is not known in
advance).
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