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Select Enable Load Balancing.
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Select the secondary interface(s) from the Secondary WAN Interface pull-down menu. If this is not configured, you need to configure a WAN interface from the Network > Interfaces page.
Appliances running SonicOS Enhanced 5.5 can support up to three alternate WAN interfaces. For these appliances, the Secondary WAN Interface pull-down menu is replaced with up to three Alternate WAN pull-down menus. The pull-down menu contains all interfaces configured as WAN interfaces. |
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Specify how often the SonicWALL appliance checks the interface (5-300 seconds) in the Check interface every field (default: 5 seconds).
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Specify the number of times the SonicWALL appliance tests the interface as inactive before failing over in the Deactive interface after field (default: 3). For example, if the SonicWALL appliance tests the interface every five seconds and finds the interface inactive after three successive attempts, it fails over to the secondary interface after 15 seconds.
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Specify the number of times the SonicWALL appliance tests the interface as active before failing back to the primary interface in the Deactive interface after field (default: 3). For example, if the SonicWALL appliance tests the interface every five seconds and finds the interface active after three successive attempts, it fails back to the primary interface after 15 seconds.
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Select Basic Active/Passive Failover to enable a basic failover setup. When the primary device fails to provide a connection, it enters standby and allows the secondary device to take over network traffic. Check Preempt and failback to Primary WAN when possible to enable immediate failback to the primary device when available.
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Select Per Connection Round-Robin to enable a Round-Robin form of load balancing. In the 17th or 18th century, when peasants in France wanted to complain to the king using a petition, the usual reaction from the monarch was to seize the two or three people on top of that petition list and execute them. In order to stop this form of arbitrary vengeance, the names were signed in a circle at the bottom of the petition so that no one would be on top of the list. This became known as a Round-Robin. Thus, in load balancing, Round-Robin is where network requests are applied to a circular list. When the network load becomes too much, GMS acts as a monarch and picks several of the network clients from the list to execute. This process allows GMS to quickly and easily free up network resources.
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Select Spillover-based and enter a value (in Kb/sec) to enable the secondary device to serve as a load balancer. With this option selected, traffic is re-routed to the secondary device should the primary WAN device exceed the specified bandwidth.
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Select Percentage-Based to split network traffic between the primary and secondary or alternate WAN interfaces based on your specified percentages. When using Percentage-Based load balancing, you might select Use Source and Destination IP Addresses Binding to keep related traffic together across an interface.
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Enter a Primary WAN Percentage and Secondary WAN Percentage that add up to 100 to divide traffic between the two WAN interfaces.
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Appliances running SonicOS Enhanced 5.5 or above can divide traffic between up to four WAN interfaces. Enter a Primary WAN Percentage, and up to three Alternate WAN Percentage settings that add up to 100.
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Primary WAN Probe Settings—Select the protocol used for monitoring and enter the IP address and port (TCP only) of the probe target. If there is an optional probe target, specify these settings also and select whether the SonicWALL appliance must test both targets or either target.
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Secondary WAN Probe Settings—Select the protocol used for monitoring and enter the IP address and port (TCP only) of the secondary probe target. If there is an optional secondary probe target, specify these settings also and select whether the SonicWALL appliance must test both targets or either target.
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WWAN WAN Probe Settings—Select the protocol used for monitoring and enter the IP address and port (TCP only) of the WWAN probe target. If there is an optional WWAN probe target, specify these settings also and select whether the SonicWALL appliance must test both targets or either target.
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Select Respond to Probes to enable GMS managed devices to respond to probe requests. With this option selected, you can also check Any TCP-SYN to Port and enter a specific port to probe.
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10
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Click Update at the bottom of the page to save these settings.
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The Network > Interfaces page allows more than two WAN interfaces to be configured for routing. It is possible to configure WAN interfaces in the Network Interfaces page, but not include them in the Failover & LB. Only the Primary WAN Ethernet Interface is required to be part of the LB group whenever LB has been enabled. Any WAN interface that does not belong to the LB group is not included in the LB function, but does normal WAN routing functions. Routing the Default & Secondary Default Gateways for Multiple WAN
The old address object, Default Gateway, corresponds to the default gateway associated with the Primary WAN in the LB group. The Secondary Default Gateway address object corresponds to the default gateway associated with Alternate WAN #1.
If DNS name resolution issues are encountered with multiple WAN interfaces, you might need to select the Specify DNS Servers Manually option on the Network > DNS page and set the servers to Public DNS Servers (ICANN or non-ICANN).