SonicWALLs feature-rich SonicOS Enhanced operating system provides a suite of configuration flexibility and redundancy features typically associated with more expensive appliances, including ISP Fail-Over, WAN Redundancy, Load Balancing, Object-based Management, Policy-Based NAT and more. In addition, upgrading to SonicOS Enhanced activates a fourth, user-defined 10/100 Ethernet interface that can be custom-configured either as a second WAN, a second LAN, a DMZ, another customized security zone or as a Hardware Fail-Over port, ensuring continuous network uptime. The PRO 2040 also integrates seamlessly with SonicWALLs portfolio of security services, including Complete Anti-Virus and Content Filtering Service, for an added layer of protection. With its innovative Web interface, the PRO 2040 is the ultimate choice for small-to-mid-sized networks requiring robust internal and external security, network configuration flexibility and ease of use.