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WAN Mode
The WAN mode page allows you to configure how your router should use your external Internet connections, for example your ADSL and WAN Ethernet port connections.
NAT is a technique which allows several computers on a LAN to share an Internet connection. The computers on the LAN use a "private" IP address range while the WAN port on the router is configured with a single "public" IP address.
Along with connection sharing, NAT also hides internal IP addresses from the computers on the Internet.
NAT (Network Address Translation)
Select NAT if your ISP has assigned only one IP address to you. The computers that connect through the router will need to be assigned IP addresses from a private subnet (example: 192.168.1.0). If your ISP has assigned an IP address for each of the computers that you use, select Classical Routing.
Note: The router will delete all inbound firewall rules when switching between NAT and Classical Routing.
Port Mode
The Port Mode settings allow you to configure whether the router should use only one WAN port or both.
If you are connected to only one ISP, then select Use single WAN port and select the WAN port that is connected to your ISP.
If you have two ISP links for Internet connectivity, the router can be configured either in Auto Rollover Mode or Dedicated Port Mode.
If you want to use a redundant ISP link for backup purposes, then choose Auto Rollover Mode and select the WAN port that will act as the primary link for this mode. Ensure that the backup WAN port is configured before enabling Auto Rollover.
 The WAN Failure Detection Method must be configured to notify the router of a link failure.
WAN Failure Detection
When the router is configured in Auto Rollover Mode, it checks the connection of the primary link at regular intervals to detect its status. Link failure is detected in one of the following ways:
v DNS Lookup
v Ping
Select DNS lookup using configured DNS Servers to detect failure of a WAN link using the DNS servers configured in the ADSL Settings or WAN Ethernet ISP Settings pages under the Network Configuration menu.
To use a specific DNS server for detecting WAN failure, select DNS lookup using this DNS Server and type in the IP address of the DNS server.
To detect WAN failure by pinging to an IP address, select Ping to this IP address and type in an IP addresses in the fields under that option. Ensure that this destination host is reliable.
The number in the Test Period field tells the router how often it should run the above configured detection method.
The Failover after field determines the number of successive failures that will trigger a switch over of the WAN link.
Click Apply to save your changes.
Click Reset to revert to the previous settings.
 

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