Creating A Nat Policy For Wan Failover - SonicWALL SonicOS Enhanced 2.2 Administrator's Manual

primary WAN becomes inactive. Because Preempt and failback to Primary WAN when possible is
selected, the secondary WAN becomes inactive when the primary WAN is detected as active.
Selecting Per Connection Round-Robin as the Outbound Load Balancing Method allows the
SonicWALL to load balance outgoing traffic on a per-destination basis by examining source and
destination IP addresses.
Tip!
Per Connection Round-Robin can be overridden by specific static route entries.
Selecting Spillover-based as the Outbound Load Balancing Method allows you to specify when the
SonicWALL starts sending traffic through the secondary WAN interface. Spillover-based load balancing
only sends traffic to the secondary WAN port when the primary WAN port traffic exceeds the value set for
Kbps. Enter a bandwidth value in the Send traffic to Secondary WAN when bandwidth exceeds __
Kbp field.
Tip!
Spillover-based Outbound Load Balancing Method can be overridden by specific static route entries.
Selecting Percentage-based as the Outbound Load Balancing Method allows you to specify the
percentages of network traffic sent through the primary and secondary WAN interfaces. This method
allows you to actively utilize both WAN interfaces by entering a percentage in the Primary WAN
Percentage field. The Secondary WAN Percentage field automatically calculates the remaining
percentage and populates the field.

Creating a NAT Policy for WAN Failover

You need to create a NAT policy on your SonicWALL for WAN Failover.
Follow these steps to create a NAT policy on your SonicWALL using the X4 interface
(PRO 3060/4060) or OPT interface (TZ 170):
1. Select Network>NAT Policies.
2. Click Add. The Add NAT Policy window is displayed.
3. Select Any from the Original Source menu.
4. Select X4 IP (PRO 3060/4060) or OPT IP (TZ 170) from the Translated Source menu.
5. Select Any from the Original Destination menu.
6. Select Original from the Translated Destination menu.
7. Select Any from the Original Service menu.
8. Select Original from the Translated Service menu.
9. Select X0 from the Inbound Interface menu.
10. Select X4 (PRO 3060/4060) or OPT interface (TZ 170) from the Outbound Interface menu.
11. Make sure the Enable setting is checked.
12. Click OK.
Page 62 SonicWALL SonicOS Standard Administrator's Guide