NETGEAR ProSafe FVX538 User Manual

Page 25

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Network Planning Guide for ProSafe VPN Firewall Router FVX538

Network Planning

2-15

October 2004

After a failover of the gateway WAN port (

Figure 2-20

), 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 2-20: Dual gateway WAN ports, after failover, for VPN telecommuter

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 router (

Figure 2-21

), the remote PC client

initiates the VPN tunnel with the appropriate gateway WAN port (i.e., 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 2-21: Dual gateway WAN ports (load balancing case) for VPN telecommuter

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

VPN Router
(at employer's
main office)

Telecommuter Example

(Dual WAN Ports, After Failover)

NAT Router B

NAT Router
(at telecommuter's
home office)

Remote PC
(running NETGEAR
ProSafe VPN Client)

Fully-Qualified Domain Names (FQDN)
- required for Fixed IP addresses
- required for Dynamic IP addresses

WAN2 IP

WAN1 port inactive

Remote PC must re-establish VPN tunnel after a failover