Glossary · Hardware
Gateway: definition, explanation, and why it matters
The network device that connects a local network to other networks — most commonly your home router acting as the bridge between your LAN and the internet.
Definition
The network device that connects a local network to other networks — most commonly your home router acting as the bridge between your LAN and the internet.
Plain-English explanation
Every device on a local network sends off-network traffic to its 'default gateway'. In a typical home, this is the LAN-side IP of your router (often 192.168.1.1 or 192.168.0.1).
Some ISPs deploy combined modem/router/Wi-Fi units they refer to as 'residential gateways'.
Real-world examples
- Running `ip route` or `route print` on most systems shows the configured default gateway.
- Misconfigured gateways are a common reason a device can reach local resources but not the internet.
Why it matters
If a device cannot reach its gateway, it cannot reach anything off the local network. Gateway tests are one of the first diagnostics for 'no internet' complaints.
Common misconceptions
- Myth: Gateway and router mean the same thing.
Reality: Routers are devices; gateway is a role. A router is one common kind of gateway, but firewalls and proxies can also serve as gateways.
Frequently asked questions
- How do I find my default gateway?
- Windows: `ipconfig`. macOS/Linux: `ip route` or `route -n get default`. Most home routers also expose it in their admin UI.