NETGEAR UTM5EW-100NAS, STM150EW-100NAS manual Configure Network Address Translation, 612

ProSecure Unified Threat Management (UTM) Appliance

For information about how to configure the USB interface as a rollover link, see the following sections:

•To configure the USB interface as the rollover link for a WAN interface, see Configure Load Balancing (Multiple WAN Port Models) on page 86.

•To configure the USB interface as the rollover link for the DSL interface, see Configure Load Balancing on page 567.

Whichever WAN mode you select, you also need to select either NAT or classical routing, as explained in the following sections.

WARNING!

When you change the WAN mode, the WAN interface or interfaces restart. If you change from primary WAN mode to load balancing mode, or the other way around, the interface through which you can access the UTM9S or UTM25S might change. Take note of the IP addresses of the interfaces before you change the WAN mode.

Configure 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 UTM9S or UTM25S) 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 UTM9S or UTM25S 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.

WARNING!

Changing the WAN mode from classical routing to NAT causes all LAN WAN and DMZ WAN inbound rules to revert to default settings.

To configure NAT:

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

3G/4G Dongles for the UTM9S and UTM25S

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