The Network Security SonicOS Platform Failover & Failback Technology
The high-end redundancy features of Dell SonicWALL E-Class Network Security Appliance (NSA), NSA and TZ Series appliances provide small-, mid- and large-size organizations with business continuity and disaster recovery at levels of reliability usually reserved for larger enterprises. Advanced features include active-passive failover for distributing or load sharing outbound WAN traffic and hardware failover for automatically activating a passive appliance to assume responsibility for forwarding traffic. Failover even extends to the VPN, allowing remote branches to connect to a secondary gateway if the primary gateway is unavailable.
Business continuity is ensured through Dell SonicWALL WAN redundancy features, hardware failover and load balancing. With six configurable Ethernet interfaces, the NSA Series is ideally suited for complex networks requiring a higher level of business continuity features.
WAN ISP failover and load balancing.
One of the user-assigned ports can be designated as a secondary WAN port, ensuring highly reliable network connectivity and robust performance. This secondary WAN port can be configured in active-passive failover mode, providing a highly efficient method for distributing or load sharing outbound WAN traffic. Load balancing is available on all the NSA Series and TZ Series appliances.
Automated failover and failback.
Failover and failback technologies are integrated into TZ , NSA, E-Class NSA Series appliances. These technologies are designed to ensure continuous uptime for IPSec VPN tunnels by automatically failing over to an alternate WAN connection should the broadband connection fail. Once the broadband is re-established, the appliance fails back to the original WAN connection, providing the best connection speed possible.
When in hardware failover mode, if the active unit fails, the passive unit will automatically detect and assume responsibility for forwarding traffic for a greater level of reliability and redundancy.
VPN Gateway failover.
The Dell SonicWALL appliance also provides support for remote/branch offices to seamlessly establish a VPN connection to a secondary gateway at the corporate headquarters, should the connection to the primary gateway be terminated. This allows for continuous uptime.