NETGEAR UTM5 Reference Manual page 531

When the UTM9S is configured in auto-rollover mode, it uses the selected WAN failure
detection method to detect the status of the primary link connection at regular intervals. Link
failure is detected in one of the following ways:
• DNS queries sent to a DNS server
• Ping request sent to an IP address
• None (no failure detection is performed)
From the primary interface, DNS queries or ping requests are sent to the specified IP
address. If replies are not received after a specified number of retries, the primary interface is
considered down, and a rollover to the backup interface occurs. When the primary interface
comes back up, another rollover occurs from the backup interface back to the primary
interface. The WAN failure detection method that you select applies only to the primary
interface, that is, it monitors the primary link only.
Configure Auto-Rollover Mode

To configure auto-rollover mode:
1. Select Network Config > WAN Settings > WAN Mode. The WAN Mode screen
displays:
Figure 313.
2. In the Load Balancing Settings section of the screen, configure the following settings:
a. Select the Primary WAN Mode radio button.
b. From the corresponding drop-down list on the right, select the DSL interface or a
WAN interface to function as the primary WAN interface. If you select the DSL
interface, both WAN interfaces become disabled; if you select a WAN interface, both
the DSL interface and the other WAN interface become disabled.
c. Select the Auto Rollover check box.
d. From the corresponding drop-down list on the right, select a WAN interface or the
DSL interface to function as the backup interface.
ProSecure Unified Threat Management (UTM) Appliance
xDSL Module for the UTM9S
531