| 1 | # default-gateway
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| 2 | [](https://www.npmjs.org/package/default-gateway) [](https://www.npmjs.org/package/default-gateway)
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| 3 |
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| 4 | Obtains the machine's default gateway through `exec` calls to OS routing interfaces.
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| 5 |
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| 6 | - On Linux and Android, the `ip` command must be available (usually provided by the `iproute2` package).
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| 7 | - On Windows, `wmic` must be available.
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| 8 | - On IBM i, the `db2util` command must be available (provided by the `db2util` package).
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| 9 | - On Unix (and macOS), the `netstat` command must be available.
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| 10 |
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| 11 | ## Installation
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| 12 |
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| 13 | ```
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| 14 | $ npm i default-gateway
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| 15 | ```
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| 16 |
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| 17 | ## Example
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| 18 |
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| 19 | ```js
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| 20 | const defaultGateway = require('default-gateway');
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| 21 |
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| 22 | const {gateway, interface} = await defaultGateway.v4();
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| 23 | // gateway = '1.2.3.4', interface = 'en1'
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| 24 |
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| 25 | const {gateway, interface} = await defaultGateway.v6();
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| 26 | // gateway = '2001:db8::1', interface = 'en2'
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| 27 |
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| 28 | const {gateway, interface} = defaultGateway.v4.sync();
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| 29 | // gateway = '1.2.3.4', interface = 'en1'
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| 30 |
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| 31 | const {gateway, interface} = defaultGateway.v6.sync();
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| 32 | // gateway = '2001:db8::1', interface = 'en2'
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| 33 | ```
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| 34 |
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| 35 | ## API
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| 36 | ### defaultGateway.v4()
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| 37 | ### defaultGateway.v6()
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| 38 | ### defaultGateway.v4.sync()
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| 39 | ### defaultGateway.v6.sync()
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| 40 |
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| 41 | Returns: `result` *Object*
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| 42 | - `gateway`: The IP address of the default gateway.
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| 43 | - `interface`: The name of the interface. On Windows, this is the network adapter name.
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| 44 |
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| 45 | The `.v{4,6}()` methods return a Promise while the `.v{4,6}.sync()` variants will return the result synchronously.
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| 46 |
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| 47 | The `gateway` property will always be defined on success, while `interface` can be `null` if it cannot be determined. All methods reject/throw on unexpected conditions.
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| 48 |
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| 49 | ## License
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| 50 |
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| 51 | © [silverwind](https://github.com/silverwind), distributed under BSD licence
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