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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

default gateway

The router a device sends a packet to whenever the destination isn't on its own subnet.

The default gateway is the router address a host uses for every destination outside its own subnet.

Examples

  • The sensor at 192.168.1.37/24 sends a packet for 198.51.100.7 to its default gateway 192.168.1.1, because that address isn't on its subnet.

  • A packet for the laptop at 192.168.1.10 goes directly, with no default gateway, since the laptop shares the sensor's /24.

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