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POHow to Determine Internet Network Interface in Java
 

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    <p>How do you determine which network interface is connected to the internet using Java? For example, I run</p> <pre><code>InetAddress.getLocalHost().getHostAddress(); </code></pre> <p>and within Eclipse this returns exactly what I intend, 192.168.1.105. However, if I package this into a jar file and run the program, the code returns 169.254.234.50. Looking into this, I found this is the IP address of a VMware Virtual Ethernet Adapter interface on my machine.</p> <p>Is there any way to determine the interface connected to the internet, yet at the same time maintain portability for my code?</p> <p><strong>Comparison of Interfaces</strong></p> <p><em>Interface [net4]</em></p> <pre><code>display name : Intel(R) Centrino(R) Ultimate-N 6300 AGN MTU : 1500 loopback : false point to point: false up : true virtual : false multicast : true HW address : 00 24 D7 2C 5F 70 INET address (IPv4): 192.168.1.105 host name : MyComputer canonical host name : MyComputer loopback : false site local : true any local : false link local : false multicast : false reachable : true </code></pre> <p><em>Interface [eth5]</em></p> <pre><code>display name : VMware Virtual Ethernet Adapter for VMnet1 MTU : 1500 loopback : false point to point: false up : true virtual : false multicast : true HW address : 00 50 56 C0 00 01 INET address (IPv4): 169.254.234.50 host name : MyComputer canonical host name : MyComputer loopback : false site local : false any local : false link local : true multicast : false reachable : true </code></pre> <p>There's a third VMware interface with site local=true and link local=false, so those fields aren't any help either.</p>
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    1. COAre you running the JAR inside a VM? The VM is its own environment, with its own network interface, which is what Java returns.
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    2. CONo, this is on a Windows 7 machine. I have VMWare installed however, and I believe this is the interface it uses to communicate with the VM. I'm not sure why Java chooses this interface as the default. This behavior is identical on my roommates computer (Windows 7, VMWare installed)
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    3. CO@CavynVonDeylen Please see my updated answer. The code I've posted only prints out my real network interface, while I've Virtual Box's network installed and enabled.
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