Building upon SonicOS Standard, SonicOS Enhanced is a software upgrade that provides advanced features including WAN ISP Fail-Over, Object-Based Management and Policy-Based NAT for more complex network installations. WAN ISP Fail-Over and Load Balancing. The SonicWALL TZ 170 offers the ability to configure the Optional port as a secondary WAN port, delivering highly reliable network connectivity and robust performance. This secondary WAN port can be used in active-active load sharing or fail-over configuration providing a highly efficient method for maximizing total network bandwidth. Object-Based Management. The SonicWALL TZ 170 provides the ability to define an object such as a user group, network address range, service or interface. When security policies change, the administrator can modify the pre-defined object and propagate the changes instantly without redefining rules, enabling businesses to implement and manage security policies easily and consistently.