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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 WAN1 and WAN2 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 Classic Routing.
Note: The router will delete all inbound firewall rules when switching between NAT and Classic 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 Load Balancing 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. When the router is configured in Auto Rollover Mode, it checks the connection of the primary link at regular intervals to detect its status.
To use multiple ISP links simultaneously, select Load Balancing. In Load Balancing mode, the two links will carry data for the protocols that are bound to them. Protocol bindings can be specified by clicking the Select Protocol Bindings link. For example, if the HTTP protocol is bound to WAN1 and FTP protocol is bound to WAN2, then the router will automatically channel FTP data from and to the computers on the LAN through the WAN2 port. All HTTP traffic will be routed through the WAN1 port. This feature can be used to segregate traffic between links that are not of the same speed. High volume traffic can be routed through the port connected to a high speed link and low volume traffic can be routed through the port connected to the slow link. When the router is configured in Load Balancing Mode, it checks the connection of both the links at regular intervals to detect its status. If WAN is configured for Idle Timeout, then Load Balancing Mode is not applicable.
WAN Failure Detection
Link failure is detected in one of the following ways:
v None
v DNS Lookup
v Ping
To have no check for detecting WAN failure, select None. This option is valid only if WAN mode is set to Load Balancing.
Select DNS lookup using configured DNS Servers to detect failure of a WAN link using the DNS servers configured in the WAN1 Settings or WAN2 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.
Set the interval in seconds to tell the router how long to wait before retrying detection of WAN failure – this is done by entering a value in seconds in the Retry Interval is field.
The Failover after field allows you to set how many attempts to retry WAN detection before failing over.
Click Apply to save your changes.
Click Reset to revert to the previous settings.
 

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