Quick Reference Guide

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Appendix B: Network Planning for Dual WAN Ports | 185
ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN FVS336Gv2 Reference Manual
VPN Gateway-to-Gateway
The following situations exemplify the requirements for a gateway VPN firewall to establish a
VPN tunnel with another gateway VPN firewall:
Single gateway WAN ports
Redundant dual gateway WAN ports for increased reliability (before and after rollover)
Dual gateway WAN ports used for load balancing
VPN Gateway-to-Gateway: Single Gateway WAN Ports (Reference Case)
In the case of single WAN ports on the gateway VPN firewalls, either gateway WAN port can
initiate the VPN tunnel with the other gateway WAN port because the IP addresses are
known in advance.
Figure B-13 Gateway-to-Gateway with Single WAN Ports
The IP address of the gateway WAN ports can be either fixed or dynamic. If an IP address is
dynamic, a fully-qualified domain name must be used. If an IP address is fixed, a
fully-qualified domain name is optional.
VPN Gateway-to-Gateway: Dual Gateway WAN Ports for Improved Reliability
In the case of the dual WAN ports on the gateway VPN firewall, 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, port WAN_A1 is active