T
o configure the Group Member Rank settings, click the Configure
icon of the Group you wish to configure on the Network
> Failover & LB
page. The General
tab screen displays.
The General tab allows the user to do modify the following settings:
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Type (or method) of LB
– Choose the type of LB from the dropdown list (Basic Active/Passive Failover, Round Robin, Spillover-Based, or Percentage-Based).
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Basic Active/Passive Failover
– The WAN interfaces use 'rank' to determine the ordering when a WAN interface goes down. If a higher-ranked WAN becomes available again, selecting the Preempt
checkbox instructs the system to revert all traffic back to the newly available higher-ranked WAN interface. Only a higher-ranked interface will preempt an Active WAN interface.
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Round Robin
– This option allows the administrator to group a set of WAN interfaces together to share their bandwidth and increase overall throughput. Each new outbound flow will be established on the next WAN interface in the list. When the last interface in the list is provided a new outbound flow, the next flow will be established over the first WAN interface in the list.
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Spillover
– The bandwidth threshold applies to the Primary WAN. Once the threshold is exceeded, new traffic flows are allocated to the Alternates in a Round Robin manner. Once the Primary WAN bandwidth goes below the configured threshold, Round Robin stops, and outbound new flows will again be sent out only through the Primary WAN. Note that existing flows will remain associated with the Alternates (since they are already cached) until they timeout normally.
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Ratio
– This option allows bandwidth distribution percentages to be applied to each interface in the LB group. To avoid problems associated with configuration errors, please ensure that the percentage correctly corresponds to the WAN interface it indicates and that the total summation equals 100%.
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Add/delete member interfaces
– Members can be added by selecting a displayed interface from the “Group Members:” column, and then clicking the Add>> button. Note that the interface listed at the top of the list is the Primary. Members can be deleted from the “Selected:” column by selecting the displayed interface, and then clicking the Remove>> button.
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Final Backup
– The final backup interface in case the other members of the group fail. When a 3G or modem card is installed on the appliance, the U0 interface is assigned as the Final Backup by default.
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When Logical probing is enabled, test packets can be sent to remote probe targets to verify
WAN path availability.
To configure the probing options for a specific Group, click the
Configure
icon of the Group you wish to configure on the Network
> Failover & LB
page. Then, click the Probing
tab.
The Probing tab allows the user to modify the following settings:
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Reactivate Interface
– After a series of successful health checks, the interface sets to “Available”
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Probe responder.global.sonicwall.com on all interfaces in this group
– Enable this checkbox to automatically set Logical/Probe Monitoring on all interfaces in the Group. When enabled, this sends TCP probe packets to the global SNWL host that responds to SNWL TCP packets, responder.global.sonicwall.com, using a target probe destination address of 204.212.170.23:50000. Once this checkbox is selected, the rest of the probe configuration will automatically enable built-in settings. The same probe will be applied to all four WAN Ethernet interfaces. Note that the Dialup WAN probe setting also defaults to the built-in settings.
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The
Probe Settings
window enables administrators to configure probe settings for interfaces that are part of Load Balancing group to monitor the interface’s connection and automate failover in case the connection goes down. Interface monitoring is accomplished by probing a specified target. To configure probe settings for an interface, perform the following steps.
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1.
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On the
Network > Failover & LB
page, click the arrow icon to expand the Load Balancing group.
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1.
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In the
Check interface every
box, enter an interval between probes (in seconds). The default value for this field is 5 seconds.
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2.
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In the
Deactivate Interface after
box, enter the number of target probes that must be missed before an interface is considered to be unavailable. The default value for this field is 6 missed intervals.
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3.
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In the
Reactivate Interface after
box, enter the number of target probes that must be successful before an interface is returned to Available status. The default value for this field is 3 successful probes
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4.
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In the
Probe Type
menu, select one of the following options:
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5.
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For both the
Main Target
and, when applicable, the Alternate Target
configure the following:
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a.
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Select
Ping (ICMP)
or TCP
from the Probe Target
menu.
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The
L
oad Balancing Statistics
table displays the following LB group statistics for the SonicWALL:
In the
Display Statistics for
pulldown menu, select which LB group you want to view statistics for.
Click the
Clear Statistic
button on the bottom right of the Network > Failover & LB
page to clear information from the Load Balancing Statistics
table.