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ProSecure Unified Threat Management (UTM) Appliance Reference Manual
3-10 Manually Configuring Internet and WAN Settings
v1.0, January 2010
If you want to use a redundant ISP link for backup purposes, select the WAN port that must act
as the primary link for this mode. Ensure that the backup WAN port has also been configured
and that you configure the WAN Failure Detection Method on the WAN Mode screen to
support auto-rollover.
• Load Balancing Mode. The UTM distributes the outbound traffic equally among the WAN
interfaces that are functional.
• Single WAN Port Mode. The selected WAN interface is made primary and the other is
disabled.
For whichever WAN mode you choose, you must also choose either NAT or classical routing, as
explained in the following sections.
Network Address Translation (All Models)
Network Address Translation (NAT) allows all PCs on your LAN to share a single public Internet
IP address. From the Internet, there is only a single device (the UTM) and a single IP address. PCs
on your LAN can use any private IP address range, and these IP addresses are not visible from the
Internet.
• The UTM uses NAT to select the correct PC (on your LAN) to receive any incoming data.
• If you only have a single public Internet IP address, you must 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 PCs, and you can map incoming traffic on
the other public IP addresses to specific PCs on your LAN. This one-to-one inbound mapping
is configured using an inbound firewall rule.
To configure NAT:
1. Select Network Config > WAN Settings from the menu, then click the WAN Mode tab. The
WAN Mode screen displays (see Figure 3-8 on page 3-12).
2. In the NAT (Network Address Translation) section of the screen select the NAT radio button.
3. Click Apply to save your settings.
Note: Scenarios could arise when load balancing needs to be bypassed for certain
traffic or applications. If certain traffic needs to travel on a specific WAN
interface, configure protocol binding rules for that WAN interface. The rule
should match the desired traffic.