Netgear FVS336Gv2 – ProSafe Dual WAN Gigabit Firewall with SSL & IPSec VPN 참조 매뉴얼

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Configure the IPv6 Internet and WAN Settings 
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ProSAFE Dual WAN Gigabit WAN SSL VPN Firewall FVS336Gv2 
Auto-Rollover for IPv6 WAN Interfaces
You can configure the VPN firewall’s IPv6 interfaces for auto-rollover for increased system 
reliability. You must specify one WAN interface as the primary interface.
The VPN firewall supports the following modes for IPv6 interfaces:
Primary WAN mode. The selected WAN interface is made the primary interface. The 
other three interfaces are disabled.
Auto-rollover mode. The selected WAN interface is defined as the primary link, and 
another interface must be defined as the rollover link. The remaining two interfaces are 
disabled. As long as the primary link is up, all traffic is sent over the primary link. When 
the primary link goes down, the rollover link is brought up to send the traffic. When the 
primary link comes back up, traffic automatically rolls back to the original primary link.
If you want to use a redundant ISP link for backup purposes, select the WAN port that 
must function as the primary link for this mode. Ensure that you also configure the backup 
WAN port and that you configure the WAN failure detection method to support 
auto-rollover.
Note:
If the VPN firewall functions in IPv4/IPv6 mode, you cannot configure 
load balancing. For information about IPv4/IPv6 mode, see 
88.
To use a redundant ISP link for backup purposes, ensure that the backup WAN interface is 
configured. Then select the WAN interface that must function as the primary link for this 
mode and configure the WAN failure detection method to support auto-rollover.
When the VPN firewall is configured in auto-rollover mode, it uses the WAN failure detection 
method to detect the status of the primary link connection at regular intervals. For IPv6 
interfaces, the VPN firewall detects link failure by sending a ping request to an IP address.
From the primary WAN interface, 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. WAN failure detection applies only to the primary WAN interface, that is, it 
monitors the primary link only.
Configure Auto-Rollover Mode for IPv6 WAN Interfaces
The following procedure describes how you can configure auto-rollover mode for IPv6 WAN 
interfaces.
To configure auto-rollover mode for IPv6 WAN interfaces:
1. 
On your computer, launch an Internet browser.