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Network>WAN Failover & LB

WAN Failover and Load Balancing allows you to designate the Modem interface for dialup backup or use the user-assigned OPT interface as a Secondary backup WAN port. The Secondary WAN port can be used in a simple active/passive setup, where traffic is only routed through the Secondary WAN port if the Primary WAN port is down and/or unavailable. This feature is referred to as basic failover. This allows the SonicWALL security appliance to maintain a persistent connection for WAN port traffic by failing over to the modem or a secondary WAN port. It can also be used in a more dynamic active/active setup, where the administrator can choose a method of dividing outbound traffic flows between the Primary fixed WAN port and the user-assigned Secondary WAN port. This latter feature is referred to as load balancing.

Alert! Before you begin, be sure you have configured a user-defined interface to mirror the WAN port settings.

WAN Failover Caveats

Setting Up WAN Failover and Load Balancing

The following are the steps to configuring WAN Failover and Load Balancing on the SonicWALL security appliance:

Configure WAN Failover to the Modem

If you are using the Modem as a backup connection for your WAN, enable WAN failover to the modem. If your primary WAN connection fails, the TZ 170 SP Wireless will automatically try to connect with the modem. It will then monitor the WAN port, and switch back when it has a reliable connection again. To configure WAN failover to the modem:

  1. In the Ethernet WAN Failover & Load Balancing section, check the Enable Load Balancing box.
  2. Check the Enable Dial-Up Wan Failover box.
  3. Click Apply.

Configuring the OPT Interface as a Secondary WAN Port

On Network > Interfaces page, configure the OPT port to be in WAN zone, and enter in the correct address settings provided by the Secondary ISP. In the example, the SonicWALL security appliance is acquiring its secondary WAN address dynamically from ISP #2, using DHCP. Any interface added to the WAN zone by default creates a NAT Policy allowing internal LAN subnets to NAT out this Secondary WAN interface.

Creating a NAT Policy for the Secondary WAN Port

You need to create a NAT policy on your SonicWALL for WAN Failover. Follow these steps to create a NAT policy on your SonicWALL using theor OPT interface:

  1. Select Network>NAT Policies.
  2. Click Add. The Add NAT Policy window is displayed.
  3. Select Any from the Original Source menu.
  4. Select OPT IP from the Translated Source menu.
  5. Select Any from the Original Destination menu.
  6. Select Original from the Translated Destination menu.
  7. Select Any from the Original Service menu.
  8. Select Original from the Translated Service menu.
  9. Select X0 from the Inbound Interface menu.
  10. Select OPT interface from the Outbound Interface menu.
  11. Make sure the Enable setting is checked.
  12. Click OK.

Activating WAN Failover and Load Balancing

To configure the SonicWALL for WAN failover and load balancing, follow the steps below:

  1. On the Network > WAN Failover & LB page, select Enable Load Balancing.
  2. From the Secondary WAN Interface menu, select your secondary WAN interface.
  3. Enter a number between 5 and 300, in the Check Interface Every _ Seconds field. You can use the default value of 5 seconds.
  4. In the Deactivate Interface after _ missed intervals field, enter a number between 1 and 10. You can use the default value of 3. If the default value is used, then the interface is considered inactive after 3 successive attempts at 5 seconds each.
  5. Enter a number between 1 and 10 in the Reactivate Interface after _ successful intervals field. You can use the default value of 3. If the default value is used, then the interface is considered active after 3 successive attempts at 5 seconds each.
  6. Click Apply.

Choosing an Outbound Load Balancing Method

You need to choose a load balancing method. By default, the SonicWALL will select Basic Active/Passive Failover as the method, but there are four load balancing methods available:

WAN Load Balancing Statistics

The WAN Load Balancing Statistics section displays the following status information on the Primary and Secondary WAN interfaces:

Clicking the Clear Statistics button at the top of the Network>WAN Faliover & Load Balancing page clears the WAN Load Balancing Statistics.

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