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POGetting the IP address of the current machine using Java
 

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  1. POGetting the IP address of the current machine using Java
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    <p>I am trying to develop a system where there are different nodes that are run on different system or on different ports on the same system. </p> <p>Now all the nodes create a Socket with a target IP as the IP of a special node known as a bootstrapping node. The nodes then create their own <code>ServerSocket</code> and start listening for connections. </p> <p>The bootstrapping node maintains a list of Nodes and returns them on being queried.</p> <p>Now what I need is the node must register its IP to the bootstrapping node. I tried using <code>cli.getInetAddress()</code> once the client connects to the <code>ServerSocket</code> of bootstrapping node but that didn't work.</p> <ol> <li>I need the client to register its PPP IP if available;</li> <li>Otherwise the LAN IP if available; </li> <li>Otherwise it must register 127.0.0.1 assuming its the same computer.</li> </ol> <p>Using the code:</p> <pre><code>System.out.println(Inet4Address.getLocalHost().getHostAddress()); </code></pre> <p>or</p> <pre><code>System.out.println(InetAddress.getLocalHost().getHostAddress()); </code></pre> <p>My PPP Connection IP address is: 117.204.44.192 but the above returns me 192.168.1.2</p> <p><strong>EDIT</strong></p> <p>I am using the following code:</p> <pre><code>Enumeration e = NetworkInterface.getNetworkInterfaces(); while(e.hasMoreElements()) { NetworkInterface n = (NetworkInterface) e.nextElement(); Enumeration ee = n.getInetAddresses(); while (ee.hasMoreElements()) { InetAddress i = (InetAddress) ee.nextElement(); System.out.println(i.getHostAddress()); } } </code></pre> <p>I am able to get all the IP addresses associated all <code>NetworkInterface</code>s, but how do I distinguish them? This is the output I am getting:</p> <pre><code>127.0.0.1 192.168.1.2 192.168.56.1 117.204.44.19 </code></pre>
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    1. COInet4Address.getLocalHost() should work right ?
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    2. COInside the loop if I add n.isPointToPoint() will that work?? My idea is to return "127.0.0.1" if no Point to Point network is found. Will that work??
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    3. CO@sasidhar : Please dont' post your genuine IP address. do write 117.xxx.xxx.xxx, for private IP that's okay.
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