asked on

getting ipv4 address from dual stack ipv6 and ipv4 host

Hi all

using Java 1.5.0_09

On windows vista (which has a dual stack IPv4 and IPv6 installed) using the code (below) only reveals the Ipv6 hostAddress. I need the IPv4 hostAddress.
Please assist

Enumeration NetEnum;
StringBuilder buff = new StringBuilder();
try {

NetEnum = NetworkInterface.getNetworkInterfaces();
Enumeration InetEnum = null;
NetworkInterface MyNet = null;
InetAddress MyInet = null;
while(NetEnum.hasMoreElements()){
MyNet = (NetworkInterface) NetEnum.nextElement();
InetEnum = MyNet.getInetAddresses();

buff.append(MyNet.getDisplayName()+"\n");
while(InetEnum.hasMoreElements()){
MyInet = (InetAddress) InetEnum.nextElement();

if(!MyInet.getHostName().equals("localhost")){
mHostName = MyInet.getHostName();
mHostAddress = MyInet.getHostAddress();
mInetAddress = MyInet;
}
buff.append(MyInet.getHostName() + " " + MyInet.getHostAddress()+"\n");
//System.out.println(MyInet.getHostName() + " " + MyInet.getHostAddress());
}
}
//log.info(buff.toString());
log.info("localhost: "+ mHostName + " " + mHostAddress);

} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

brunoguimaraes

Have you tried using java.net.Inet4Address class?

http://java.sun.com/j2se/1.5/docs/api/java/net/Inet4Address.html

stef4s

ASKER

Yes I have. unfortunately when trying to convert addresses i get a Casting exception.

I have however found a way to get the ipv4 address. (I don't understand why the code below returns a ipv4 address)

So the solution is

try
{
InetAddress ia = InetAddress.getLocalHost();
mHostName = ia.getHostName();
mHostAddress = ia.getHostAddress();
mInetAddress = ia;
log.info("IP", mInetAddress);

}
catch (UnknownHostException e)
{
//System.out.println("oops, couldn't get localhost");
log.error("could not get localhost");
}

Thanks

ASKER CERTIFIED SOLUTION

Computer101

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