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3G/4G Dongles for the UTM9S and UTM25S
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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: