Netgear SRX5308 SRX5308 Reference Manual - Page 42
Configuring the Auto-Rollover Mode and Failure Detection Method, Configuring Auto-Rollover Mode
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ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308 Reference Manual Configuring the Auto-Rollover Mode and Failure Detection Method 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 will act as the primary link for this mode and configure the WAN failure detection method on the WAN Mode screen to support autorollover. When the VPN firewall 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: • By sending DNS queries to a DNS server • By sending a ping request 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 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. Configuring Auto-Rollover Mode To configure auto-rollover mode: 1. Select Network Configuration > WAN Settings from the menu. 2. Click the WAN Mode tab. The WAN Mode screen displays (see Figure 2-13 on page 2-19). 2-18 Connecting the VPN Firewall to the Internet v1.0, April 2010