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SonicOS Enhanced 4.0 Administrator Guide
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Basic Active/Passive Failover: When this setting is selected, the SonicWALL security
appliance only sends traffic through the Secondary WAN interface if the Primary WAN
interface has been marked inactive. The SonicWALL security appliance is set to use
this as the default load balancing method. If the Primary WAN fails, then the
SonicWALL security appliance reverts to this method instead of the ones described
below. This mode will automatically return back to using the Primary WAN interface
once it has been restored (preempt mode).
This item has an associated Preempt and fail back to Primary WAN when possible
checkbox. When this checkbox is selected, the SonicWALL security appliance switches
back to sending its traffic across the Primary WAN interface when it resumes
responding to the SonicWALL security appliance’s checks (the WAN’s physical link is
restored, or the logical probe targets on the WAN port resume responding).
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Per Destination Round-Robin: When this setting is selected, the SonicWALL security
appliance Load Balances outgoing traffic on a per-destination basis. This is a simple
load balancing method and, though not very granular, allows you to utilize both links in
a basic fashion (instead of the method above, which does not utilize the capability of
the Secondary WAN until the Primary WAN has failed). The SonicWALL security
appliance needs to examine outbound flows for uniqueness in source IP and
destination IP and make the determination as to which interface to send the traffic out
of and accept it back on. Please note this feature will be overridden by specific static
route entries.
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Spillover-Based: When this settings is selected, the user can specify when the
SonicWALL security appliance starts sending traffic through the Secondary WAN
interface. This method allows you to control when and if the Secondary interface is
used. This method is used if you do not want outbound traffic sent across the
Secondary WAN unless the Primary WAN is overloaded.
Specify the maximum allowed bandwidth on the primary WAN interface in the Send
traffic to Secondary WAN interface when bandwidth exceeds _ Kbps field. The
SonicWALL security appliance has a non-Management Interface exposed hold timer
set to 20 seconds – if the sustained outbound traffic across the Primary WAN interface
exceeds the administrator defined bps, then the SonicWALL security appliance spills
outbound traffic to the Secondary WAN interface (on a per-destination basis). Please
note this feature will be overridden by specific static route entries.
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Percentage-Based: When this setting is selected, you can specify the percentages of
traffic sent through the Primary WAN and Secondary WAN interfaces. This method
allows you to actively utilize both Primary and Secondary WAN interfaces. Only one