[GitHub] [cloudstack] ustcweizhou edited a comment on issue #3311: Issues when multiple management IP addresses are set in the KVM hypervisor (with fix)

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ustcweizhou edited a comment on issue #3311: Issues when multiple management IP 
addresses are set in the KVM hypervisor (with fix)
URL: https://github.com/apache/cloudstack/issues/3311#issuecomment-506981342
 
 
   @rhtyd 
   
   I tested the following java code in centos6, centos7, ubuntu12 and ubuntu16. 
   It lists all devices and ips in reverse order as "ip a".
   So I think it is better to reverse the ip addresses as usually we use the 
first ip of nics for communication.
   
   ListNetworkAddresses.java
   ```
   import java.net.InterfaceAddress;
   import java.net.NetworkInterface;
   import java.util.Collections;
   import java.util.List;
   
   public class ListNetworkAddresses {
       public static void main(String[] args) throws Exception {
           final List<NetworkInterface> nics = 
Collections.list(NetworkInterface.getNetworkInterfaces());
           for (final NetworkInterface nic : nics) {
               final List<InterfaceAddress> addrs = nic.getInterfaceAddresses();
               if (addrs != null) {
                   for (final InterfaceAddress addr : addrs) {
                       System.out.println("network device name is " + 
nic.getName() + ", ip is " + addr.getAddress().getHostAddress());
                   }
               }
           }
       }
   }
   ```
   
   command
   ```
   javac ListNetworkAddresses.java && java ListNetworkAddresses
   ```

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