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Appendix B: Network Planning for Dual WAN Ports | 189
ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN FVS336Gv2 Reference Manual
After a rollover of the gateway WAN port, the previously inactive gateway WAN port becomes
the active port (port WAN2 in this example) and the remote PC must re-establish the VPN
tunnel. The gateway WAN port must act as the responder.
Figure B-19 Telecommuter Example
The purpose of the fully-qualified domain name is this case is to toggle the domain name of
the gateway router between the IP addresses of the active WAN port (i.e., WAN1 and WAN2)
so that the remote PC client can determine the gateway IP address to establish or
re-establish a VPN tunnel.
VPN Telecommuter: Dual Gateway WAN Ports for Load Balancing
In the case of the dual WAN ports on the gateway VPN firewall, the remote PC client 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 remote NAT router is not known in advance. The chosen gateway WAN port must act as
the responder.
Figure B-20 Telecommuter, Dual WAN Ports, Load Balancing
The IP addresses 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.