Picking up IP LAN for sending with ajax

Question

I need to get the ip "LOCAL" (LAN) using javascript. I happen to have an application on my servers, but a client requested a customized service. I need to retrieve the client’s local IP address over the Internet and send it to the database on my ajax servers. I need to know how I could do with Activex or Java to take the information locally and put it into a javascript variable so I can make an AJAX call to load the information.

Example: Local IP: 192.168.1.1 | IP Wan: 182.236.10.25

The wan ip is easy to recover, I need the Local IP (Lan).

Answer 1

I don’t think you can do that, because local addressing is a way for your router to distribute 1 WAN address to various machines on the LAN through NAT. The local address is managed by the router and is only accessible by those who are on the same network level. All machines of a LAN that communicates with another machine through the WAN, it will be communicating with the WAN IP of the router.

Answer 2

This function returns the IP of the machine accessing the page:

function myIP() {
  if (window.XMLHttpRequest) xmlhttp = new XMLHttpRequest();
  else xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

  xmlhttp.open("GET", "http://api.hostip.info/get_html.php", false);
  xmlhttp.send();

  hostipInfo = xmlhttp.responseText.split("\n");

  for (i = 0; hostipInfo.length >= i; i++) {
    ipAddress = hostipInfo[i].split(":");
    if (ipAddress[0] == "IP") return ipAddress[1];
  }

  return false;

}

var IP = myIP();
if (IP != false) {
  //alert(IP);
  /* Executa sua requisicao AJAX aqui. O IP estará armazenado na variavel IP */
};

Answer 3

From what I’ve seen your application wants to get its own local ip via JAVA?

public static String pegaIpLocal()
    {
        String s="";
        try
        {
            InetAddress in = InetAddress.getLocalHost();
            s = in.getHostAddress();

        } catch(Exception j){}

        return s;
    }

I have a solution with NODEJS, where you could already do this with javascript and already insert in the database. Follow the code below, if you really want to implement this in nodejs let me know that I help you. It’s quiet.

var os=require('os'),
    mysql = require('mysql');

var ifaces=os.networkInterfaces();
var ip = [];
for (var dev in ifaces) {
  ifaces[dev].forEach(function(details){
    if (details.family=='IPv4') {
      ip.push(details.address);
    }
  });
}

var post = {
    ip : ip[0];
} 

var connection = mysql.createConnection({
  host     : 'ipDoServidor',
  user     : 'usuario',
  password : 'senha',
});

connection.connect();
connection.query('INSERT INTO tabela SET ?', post, function(err, result) {
    if(err){
        console.log('Erro ao inserir ip');
    }
    console.log('Ip inserido com sucesso');
});