Cisco PIX 525 Unrestricted Bundle Firewall, PIX-525-UR-BUN The Cisco PIX 525 Firewall enables secure private communications over the Internet or any IP network. It integrates key features of VPNs - tunneling, data encryption, security, and firewalling - to provide a secure, scalable platform to better and more cost-effectively accommodate remote-access, remote-office, and extranet connectivity using public data services..