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IPv4 and IPv6 Internet and WAN Settings
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ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308
Configure 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 auto-rollover.
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. The
VPN firewall detects link failure in one of the following ways:
• By send
ing DNS queries to a DNS server
• By send
ing 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
addre
ss. 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.
Configure Auto-Rollover Mode
To configure auto-rollover mode:
1. Select Network Configurati
on > WAN Settings > WAN Mode. The WAN Mode screen
displays:
Figure 23.