NETGEAR FVS318N manual Configure the IPv4 WAN Mode, Network Address Translation, Classical Routing

ProSafe Wireless-N 8-Port Gigabit VPN Firewall FVS318N

Configure the IPv4 WAN Mode

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 Configure the IPv6 Routing Mode on page 38).

Network Address Translation

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.

Classical Routing

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 View the System Status on page 356).

Configure the IPv4 Routing Mode

To configure the IPv4 routing mode:

1. Select Network Configuration > WAN Settings. The WAN Mode screen displays:

IPv4 and IPv6 Internet and Broadband Settings

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