Netgear FVS318N – Prosafe Wireless N VPN Firewall 参照マニュアル

connection to your ISP on the WAN port. The web management interface offers two 
connection configuration options, described in the following sections:

By default, IPv4 is supported and functions in NAT mode but can also function in classical 
routing mode. IPv4 functions the same way in IPv4-only mode that it does in IPv4 / IPv6 
mode. The latter mode adds IPv6 functionality (see 

39).

Network Address Translation (NAT) allows all computers on your LAN to share a single public 
Internet IP address. From the Internet, there is only a single device (the wireless VPN 
firewall) and a single IP address. Computers on your LAN can use any private IP address 
range, and these IP addresses are not visible from the Internet.

Note the following about NAT:

The wireless VPN firewall uses NAT to select the correct computer (on your LAN) to 
receive any incoming data. 

If you have only a single public Internet IP address, you need to use NAT (the default 
setting).

If your ISP has provided you with multiple public IP addresses, you can use one address 
as the primary shared address for Internet access by your computers, and you can map 
incoming traffic on the other public IP addresses to specific computers on your LAN. This 
one-to-one inbound mapping is configured using an inbound firewall rule.

In classical routing mode, the wireless VPN firewall performs routing, but without NAT. To 
gain Internet access, each computer on your LAN needs to have a valid static Internet IP 
address. 

If your ISP has allocated a number of static IP addresses to you, and you have assigned one 
of these addresses to each computer, you can choose classical routing. Or you can use 
classical routing for routing private IP addresses within a campus environment.

To view the status of the WAN ports, you can view the Router Status screen (see 

359).