SensorFu Beacon is a network isolation verification tool that continuously tests whether segmented, segregated, or air-gapped networks are leaking traffic. Beacons are deployed inside target networks and periodically attempt to establish outbound connections to a central "Home" server. If a connection succeeds, the Home server triggers an alert, indicating that the network isolation has been breached or misconfigured. Beacon tests connectivity across multiple protocols and layers, including IPv4, IPv6, TCP, UDP, ICMP, DNS, Ethernet Broadcast, and IP Payload. This allows it to detect leaks across firewalled, layered, and air-gapped environments. Deployment options include: - Beacon Application: Installable on Windows (AMD64) and Linux (AMD64, AArch64) workstations, laptops, or cloud instances. Supports deployment via management tools. - Beacon Virtual: Distributed as an OVA-format virtual machine image for deployment inside data centers. - Beacon Device: A hardware-compatible image that runs on Raspberry Pi devices, deployed physically inside networks. Alerts are delivered via Slack or an HTTP API when a Beacon successfully reaches Home, indicating a network leak. The tool is designed to test one specific security control (network isolation) across many locations simultaneously, rather than performing broad vulnerability scanning.