D-Link Systems recently launched a line of WiFi hot-spot gateways for smaller businesses. The Airspot Public/Private Gateway provides a firewall, Dynamic Host Configuration Protocol server and router for both public and private Internet access. The device can control and monitor up to 250 public user accounts while maintaining a private LAN for employees behind the firewall. For larger hot spots, the device supports POP3, RADIUS and Lightweight Directory Access Protocol external authentication. The DSL-3100 costs US$600.