Cisco PIX 506 VPN Firewall, PIX-506 The PIX 506 delivers enterprise-class security for remote office/branch office environments in a robust, reliable security appliance. Ideal for securing Internet connections for remote/branch offices, the PIX 506, part of the market-leading Cisco PIX Firewall Series, provides a wide range of rich security capabilities and remote management capabilities in a cost-effective, high-performance solution.