如何在双栈操作系统上同时获取IPv4和IPv6 [英] How to fetch both IPv4 and IPv6 on dual stack OS

问题描述

我有双栈机。

我的问题是我只使用

InetAddress address = InetAddress.getLocalHost();

如果我使用网络接口API，那么我将获得包含我的MAC地址的所有IP地址以IP地址的形式。
why-do-i- get-multiple-global-ipv6-addresses-listed-in-ifconfig

and If i use Network Interface API then i get all the IP address in which includes my MAC addrres as well in the form of IP address. why-do-i-get-multiple-global-ipv6-addresses-listed-in-ifconfig

现在有什么方法可以同时获得我的机器的IPv4和IPv6。

Now is there any way i can get both IPv4 and IPv6 of my machine.

推荐答案

在Linux中，
InetAddress.getLocalHost（）将查找主机名，然后返回分配的第一个IP地址通过DNS到该主机名。如果文件/ etc / hosts中有该主机名，它将获得该文件中该主机名的第一个IP地址。

In Linux, InetAddress.getLocalHost() will look for the hostname and then return the first IP address assigned to that hostname by DNS. If you have that hostname in the file /etc/hosts, it will get the first IP address in that file for that hostname.

如果你注意这个方法只返回一个InetAddress。

If you pay attention this method returns only one InetAddress.

如果您尚未分配主机名，则很可能是localhost.localdomain。您可以使用命令行设置主机名：

If you haven't assigned a hostname, most probably it will be localhost.localdomain. You can set the hostname with command line:

hostname [name]

或将其设置在文件/ etc / sysconfig / network中

or by setting it in file /etc/sysconfig/network

如果你想得到所有ip分配给您可以使用的主机名的地址（包括IPv6）：

If you want to get all ip addresses, including IPv6, assigned to a hostname you can use:

InetAddress.getAllByName(InetAddress.getLocalHost().getHostName());

如果要获取分配给主机网络接口的所有IP地址（包括IPv6），则必须使用类NetworkInterface。

If you want to get all ip addresses, including IPv6, assigned to a host's network interfaces, you must use class NetworkInterface.

这里我粘贴了一些示例代码：

Here I'm pasting some example code:

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.net.SocketException;
import java.net.NetworkInterface;
import java.util.*;

public class Test
{
    public static void main(String[] args)
    {
        try
        {
            System.out.println("getLocalHost: " + InetAddress.getLocalHost().toString());

            System.out.println("All addresses for local host:");
            InetAddress[] addr = InetAddress.getAllByName(InetAddress.getLocalHost().getHostName());
            for(InetAddress a : addr)
            {
              System.out.println(a.toString());
            }
        }
        catch(UnknownHostException _e)
        {
            _e.printStackTrace();
        }

        try
        {
            Enumeration nicEnum = NetworkInterface.getNetworkInterfaces();
            while(nicEnum.hasMoreElements())
            {
                NetworkInterface ni=(NetworkInterface) nicEnum.nextElement();
                System.out.println("Name: " + ni.getDisplayName());
                System.out.println("Name: " + ni.getName());
                Enumeration addrEnum = ni.getInetAddresses();
                while(addrEnum.hasMoreElements()) 
                {
                    InetAddress ia= (InetAddress) addrEnum.nextElement();
                    System.out.println(ia.getHostAddress());
                }
            }
        }
        catch(SocketException _e)
        {
            _e.printStackTrace();
        }
    }
}

对于这个例子，我得到了来自 InetAddress.getLocalHost（）。getHostAddress中的一个响应的代码（）返回127.0.1.1

For this example, I got code from one of the responses in InetAddress.getLocalHost().getHostAddress() is returning 127.0.1.1

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