Netgear UTM9S – ProSECURE Unified Threat Management (UTM) Appliance with DSL and Wireless modules 参照マニュアル

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Select Network Config > WAN Settings > WAN Mode. The WAN Mode screen 
displays (see 

 on page 79).

In the NAT (Network Address Translation) section of the screen, select the Classical 
Routing radio button.

Click Apply to save your settings.

Configure Auto-Rollover Mode and the Failure Detection

Method (Multiple WAN Port Models)

To use a redundant ISP link for backup purposes, ensure that the backup WAN interface has 
already been configured. Then select the WAN interface that should function as the primary 
link for this mode, and configure the WAN failure detection method on the WAN Mode screen 
to support auto-rollover.

When the UTM 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 WAN 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 WAN 
interface is considered down, and a rollover to the backup WAN interface occurs. When the 
primary WAN interface comes back up, another rollover occurs from the backup WAN 
interface back to the primary WAN interface. The WAN failure detection method that you 
select applies only to the primary WAN interface, that is, it monitors the primary link only.

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