@achingbrain/nat-port-mapper

@achingbrain/nat-port-mapper

Port mapping with UPnP and NAT-PMP

About

Enable NAT traversal by mapping public ports to ports on your computer using either UPnP or NAT-PMP.

Example - UPnP NAT

import { upnpNat } from '@achingbrain/nat-port-mapper'

const client = upnpNat()

for await (const gateway of client.findGateways({ signal: AbortSignal.timeout(10000) })) {
  // Map public port 1000 to private port 1000 with TCP
  await gateway.map(1000, '192.168.1.123', {
    protocol: 'tcp'
  })

  // Map port 3000 to any available host name
  for await (const mapping of gateway.mapAll(3000, {
    protocol: 'udp'
  })) {
    console.info(`mapped ${mapping.internalHost}:${mapping.internalPort} to ${mapping.externalHost}:${mapping.externalPort}`)
  }

  // Unmap previously mapped private port 1000
  await gateway.unmap(1000)

  // Get external IP
  const externalIp = await gateway.externalIp()

  console.log('External IP:', externalIp)

  // Unmap all mapped ports and cancel any in-flight network operations
  await gateway.stop()
}

Example - NAT-PMP

import { pmpNat } from '@achingbrain/nat-port-mapper'
import { gateway4sync } from 'default-gateway'

const gateway = pmpNat(gateway4sync().gateway)

// Map public port 1000 to private port 1000 with TCP
await gateway.map(1000, '192.168.1.123', {
  protocol: 'tcp'
})

// Map public port 2000 to private port 3000 with UDP
await gateway.map(3000, '192.168.1.123', {
  externalPort: 2000,
  protocol: 'udp'
})

// Unmap previously mapped private port 1000
await gateway.unmap(1000)

// Get external IP
const externalIp = await gateway.externalIp()

console.log('External IP:', externalIp)

// Unmap all mapped ports and cancel any in-flight network operations
await gateway.stop()

Credits

Based on alxhotel/nat-api

Additional Information

• http://miniupnp.free.fr/nat-pmp.html
• http://wikipedia.org/wiki/NAT_Port_Mapping_Protocol
• http://tools.ietf.org/html/draft-cheshire-nat-pmp-03

Install

$ npm i @achingbrain/nat-port-mapper

API Docs

• https://achingbrain.github.io/nat-port-mapper

License

Licensed under either of

• Apache 2.0, (LICENSE-APACHE / http://www.apache.org/licenses/LICENSE-2.0)
• MIT (LICENSE-MIT / http://opensource.org/licenses/MIT)

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Changelog

4.0.4 (2025-06-24)

Bug Fixes

• use socket for every interface for discovery (#97) (08a1555)