code: function pingServer (address) {
    return new Promise(function (resolve) {
      var socket = new net.Socket()
      socket.setTimeout(1000, close)
      socket.connect(80, address, close)
      socket.once('error', close)
  
      function close () {
        socket.destroy()
        resolve(address)
      }
    })
  }
docs: Pings and individual server to update the arp table.