SonicWALL TZ 210 Series Getting Started Manual page 67

TZ_210_GSG.book Page 56 Thursday, November 13, 2008 7:41 PM
3. Select 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:
Basic Active/ Only sends traffic through the Secondary WAN
Passive Failover interface if the Primary WAN interface has been
marked inactive. If the Primary WAN fails, then the
SonicWALL security appliance reverts to this
method. This mode will automatically return back
to using the Primary WAN interface once it has
been restored (preempt mode).
Per Destination Load balances outgoing traffic on a per-
Round-Robin destination basis. This is a simple load balancing
method which 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).
Spillover-Based Allows you to control when and if the Secondary
interface is used. You can specify when the
SonicWALL security appliance starts sending
traffic through the Secondary WAN interface.
Percentage- Specifies the percentages of traffic sent through
Based the Primary WAN and Secondary WAN interfaces.
Optionally, enable Source and Destination IP
Address Binding: Enables you to maintain a
consistent mapping of traffic flows with a single
outbound WAN interface, regardless of the
percentage of traffic through that interface.
Page 56 Multiple ISP / WAN Failover and Load Balancing
Configuring WAN Interface Monitoring
Under the WAN Interface Monitoring heading, you can
customize how the SonicWALL security appliance monitors the
WAN interface:
1. Enter a number between 5 and 300, in the Check
Interface Every _ Seconds field. The default value is 5
seconds.
2. In the Deactivate Interface after _ missed intervals,
enter a number between 1 and 10. The default value is 3,
which means the interface is considered inactive after 3
consecutive unsuccessful attempts.
3. Enter a number between 1 and 100 in the Reactivate
Interface after _ successful intervals. The default value
is 3, which means the interface is considered active after 3
consecutive successful attempts.
WAN Probe Monitoring Overview
If Probe Monitoring is not activated, the SonicWALL security
appliance performs physical monitoring only on the Primary and
Secondary WAN interfaces, meaning it only marks a WAN
interface as failed if the interface is disconnected or stops
receiving an Ethernet-layer signal. This is not an assured
means of link monitoring, because it does not address most
failure scenarios (for example, routing issues with your ISP or
an upstream router that is no longer passing traffic). If the WAN
interface is connected to a hub or switch, and the router