Netgear FVX538v1 FVX538 Reference Manual - Page 202
The purpose of the fully-qualified domain names is this case is to toggle the domain name of
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ProSafe VPN Firewall 200 FVX538 Reference Manual 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 ports could be either WAN_A1, WAN_A2, WAN_B1, or WAN_B2 (i.e., the IP address of the active WAN port is not known in advance). After a rollover of a gateway WAN port, the previously inactive gateway WAN port becomes the active port (port WAN_A2 in this example) and one of the gateway VPN firewalls must reestablish the VPN tunnel. Figure B-15 The purpose of the fully-qualified domain names is this case is to toggle the domain name of the failed-over gateway firewall between the IP addresses of the active WAN port (i.e., WAN_A1 and WAN _A2 in this example) so that the other end of the tunnel has a known gateway IP address to establish or re-establish a VPN tunnel. B-16 Network Planning for Dual WAN Ports v1.0, March 2009