Netgear FVS124G FVS124G Reference Manual - Page 32

Reference Manual for the ProSafe VPN Firewall 25 with 4 Gigabit LAN and Dual WAN Ports Note: Once the gateway firewall WAN port rolls over, the VPN tunnel collapses and must be re-established using the new WAN IP address. The Rollover Case for Firewalls With Dual WAN Ports Rollover (Figure 3-1) for the dual WAN port case is different from the single gateway WAN port case when specifying the IP address. Only one WAN port is active at a time and when it rolls over, the IP address of the active WAN port always changes. Hence, the use of a fully-qualified domain name is always required, even when the IP address of each WAN port is fixed. Dual WAN Ports (Before Rollover) Dual WAN Ports (After Rollover) Router WAN1 IP WAN1 port active X X WAN2 port inactive WAN2 IP (N/A) IP address of active WAN port changes after a rollover: o use of fully-qualified domain names always required o features requiring fixed IP address blocks not supported Router WAN1 IP (N/A) WAN1 port inactive X X WAN2 port active WAN2 IP Figure 3-1: Dual WAN ports before and after rollover Features such as multiple exposed hosts are not supported when using dual WAN port rollover because the IP addresses of each WAN port must be in the identical range of fixed addresses. The Load Balancing Case for Firewalls With Dual WAN Ports Load balancing (Figure 3-2) for the dual WAN port case is similar to the single WAN port case when specifying the IP address. Each IP address is either fixed or dynamic based on the ISP: fully-qualified domain names must be used when the IP address is dynamic and are optional when the IP address is static. Dual WAN Ports (Load Balancing) Router WAN1 IP netgear1.dyndns.org netgear2.dyndns.org WAN2 IP Use of fully-qualified domain names for IP addresses of WAN ports: o required for dynamic IP addresses o optional for fixed IP addresses Figure 3-2: Dual WAN ports for load balancing 3-2 Network Planning 202-10085-01, March 2005