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Network Planning for Multiple WAN Ports (IPv4 Only)
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ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308
Figure 268.
The purpose of the FQDN in this case is to toggle the domain name of the gateway firewall
between the IP addresses of the active WAN port (that is, WAN1 and WAN2) so that the
remote computer client can determine the gateway IP address to establish or reestablish a
VPN tunnel.
VPN Road Warrior: Dual-Gateway WAN Ports for Load Balancing
In a gateway configuration with dual WAN ports that function in load balancing mode, the
remote computer initiates the VPN tunnel with the appropriate gateway WAN port (that is,
port WAN1 or WAN2 as necessary to balance the loads of the two gateway WAN ports)
because the IP address of the active WAN port is not known in advance. The selected
gateway WAN port needs to act as the responder.
Figure 269.
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.