SonicWALL 5.8.1 Manuale Utente

If you will not be using Primary/Backup WAN Management IP address, make sure each entry 
field is set to ‘0.0.0.0’ (in the High Availability > Monitoring Page) – the SonicWALL will report 
an error if the field is left blank.

If each SonicWALL has a Primary/Backup WAN Management IP address for remote 
management, the WAN IP addresses must be in the same subnet. If shifting a previously 
assigned interface to act as a unique WAN interface, be sure to remove any custom NAT 
policies that were associated with that interface before configuring it.

The following figure shows an example of how to connect two SonicWALL security appliances 
for Stateful High Availability. The units are connected with their designated HA ports.

The LAN (X0) interfaces are connected to a switch on the LAN network. The WAN (X1) 
interfaces are connected to another switch, which connects to the Internet. The designated high 
availability interfaces are connected directly to each other using a crossover cable. 

If you are connecting the Primary and Backup appliances to an Ethernet switch that uses 
the spanning tree protocol, be aware that it may be necessary to adjust the link activation 
time on the switch port to which the SonicWALL interfaces connect. For example, on a Cisco 
Catalyst-series switch, it is necessary to activate spanning tree port fast for each port 
connecting to the SonicWALL security appliance’s interfaces. 

Before you begin the configuration of High Availability on the Primary SonicWALL security 
appliance, perform the following initial setup procedures.

Register and associate the Primary and Backup SonicWALL security appliances as a High 
Availability pair on MySonicWALL. See 

On the back of the Backup SonicWALL security appliance, locate the serial number and 
write the number down. You need to enter this number in the High Availability > Settings 
page.

Make sure that the two appliances are running the same SonicOS Enhanced versions.

Network Security Appliance

Internet

HA Link