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ProSafe VPN Firewall 200 FVX538 Reference Manual
Network Planning for Dual WAN Ports C-19
v1.0, August 2006
The IP addresses of the gateway WAN ports can be either fixed or dynamic, but a fully-qualified
domain name must always be used because the active WAN port could be either WAN1 or WAN2
(i.e., the IP address of the active WAN port is not known in advance).
After a rollover of the gateway WAN port (Figure C-19), 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.
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.
Figure C-19
Gateway A
bzrouter2.dyndns.org
10.5.6.0/24
10.5.6.1
WAN1 IP (N/A)
WAN IP
LAN IP
Client B
0.0.0.0
VPNRouter
(atemployer's
mainoffice)
Telecommuter Example
(Dual WAN Ports, After Rollover)
NAT Router B
NATRouter
(attelecommuter's
homeoffice)
RemotePC
(runningNETGEAR
ProSafeVPNClient)
Fully-QualifiedDomainNames(FQDN)
-requiredforFixedIPaddresses
-requiredforDynamicIPaddresses
WAN2 IP
WAN1 port inactive
RemotePCmustre-establishVPNtunnelafterarollover
XX