Netgear SRX5308 Specifications Page 318

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Network Planning for Multiple WAN Ports
318
ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308
After a rollover of a gateway WAN port, the previously inactive gateway WAN port becomes
the active port (port WAN_A2 in the following figure), and one of the gateways needs to
reestablish the VPN tunnel.
Figure 196.
The purpose of the FQDNs is to toggle the domain name of the rolled-over gateway between
the IP addresses of the active WAN port (that is, WAN_A1 and WAN_A2 in the previous
figure) so that the other end of the tunnel has a known gateway IP address to establish or
reestablish a VPN tunnel.
VPN Gateway-to-Gateway: Dual Gateway WAN Ports for Load Balancing
In a configuration with two dual-WAN port VPN gateways that function in load balancing
mode, either of the gateway WAN ports at one end can be programmed in advance to initiate
the VPN tunnel with the appropriate gateway WAN port at the other end as necessary to
manage the loads of the gateway WAN ports because the IP addresses of the WAN ports are
known in advance.
Figure 197.
The IP addresses 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.
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