SonicWALL TZ 190 Manuale Utente

entry box is required (percentage for Primary WAN) The management interface 
automatically populates the non-user-editable entry box with the remaining percentage 
assigned to the Secondary WAN interface. Please note this feature will be overridden 
by specific static route entries.

Use Source and Destination IP Address Binding: When you are using 
percentage-based load balancing, this checkbox 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. Therefore, the 
outbound IP address of the connection remains consistent. However the 
percentage of traffic in each WAN interface may not match the percentage you 
specify in the Primary WAN Percentage field. 

This method uses only the source IP address and the destination IP address to 
determine when to bind a connection to a single interface and ignores all other 
information, such as source and destination TCP port numbers.

Click Apply.

Under the WAN Interface Monitoring heading, you can customize how the SonicWALL 
security appliance monitors the WAN interface:

Enter a number between 5 and 300, in the Check Interface Every _ Seconds field. The 
default value is 5 seconds.

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. 

Enter a number between 1 and 10 in the Reactivate Interface after _ successful 
intervals. The default value is 3, which means the interface is considered active after 3 
consecutive successful attempts. 

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 providing 
the connection to the ISP (also connected to this hub or switch) were to fail, the SonicWALL 
will continue to believe the WAN link is usable, because the connection to the hub or switch is 
good.

Enabling probe monitoring on the Network > WAN Failover & Load Balancing page instructs 
the SonicWALL security appliance to perform logical checks of upstream targets to ensure that 
the line is indeed usable, eliminating this potential problem, as well as continue to do physical 
monitoring. Under the default probe monitoring configuration, the SonicWALL performs an 
ICMP ping probe of both WAN ports’ default gateways. Unfortunately, this is also not an 
assured means of link monitoring, because service interruption may be occurring farther