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SONICWALL SONICOS ENHANCED 2.5 ADMINISTRATOR’S GUIDE
63
Network > WAN Failover & LB
C
HAPTER
10
Chapter 10: Setting Up WAN Failover and
Load Balancing
Network > WAN Failover & LB
WAN Failover and Load Balancing allows you to designate one of the user-assigned interfaces as a
Secondary or backup WAN port. The Secondary WAN port can be used in a simple active/passive
setup, where traffic is only routed through the Secondary WAN port if the Primary WAN port is down
and/or unavailable. In this chapter, this feature is referred to as basic failover. This allows the
SonicWALL security appliance to maintain a persistent connection for WAN port traffic by failing over
to the secondary WAN port. It can also be used in a more dynamic active/active setup, where the
administrator can choose a method of dividing outbound traffic flows between the Primary fixed WAN
port and the user-assigned Secondary WAN port. This latter feature is referred to as load balancing.
WAN Failover Caveats
• WAN Failover and Load-Balancing applies to outbound-initiated traffic only; it cannot be used to
perform inbound load-balancing functions, such as what a content switching or load-balancing
appliance provides.
• Make sure that the SonicWALL security appliance has the proper NAT policies for the Secondary
WAN interface an incorrect or missing NAT Policy for the Secondary WAN port is the most
common problem seen when configuring WAN Failover & Load-Balancing.
• The Primary and Secondary WAN ports cannot be on the same IP subnet; each WAN connection
must be on unique IP subnets in order to work properly