The VPN license upgrade enables the DWC-1000 to provide VPN, Router, & Firewall functionality. The firewall function allows administrators to control network access by setting classification policies. The dual Option ports provide link failover & provide Internet connection redundancy to ensure Internet access. The virtual private network (VPN) features provide secure remote control to manage access points in branch offices. Site-to-site VPN tunnels use IP Security (IPSec) Protocol, Point-to-Point Tunneling Protocol (PPTP), or Layer 2 Tunneling Protocol (L2TP) to facilitate branch office connectivity through encrypted virtual links. In addition, the Secure Sockets Layer (SSL) VPN tunnels empower mobile users by providing remote access to a central corporate database.