谁能解释为什么 Java GetNetworkInterfaces 在 Windows 7 上返回这么多接口

Question

我一直在使用 NetworkInterface.getNetworkInterfaces() 查询我的机器上的网络接口。本质上我正在尝试寻找网络接口卡。这些通常被称为 eth0、eth1 等。

它在 win xp 甚至 vista 上运行得很好，只需要一点过滤。

我刚刚注意到在 Windows 7 的某些配置中我得到了大量列出的网络适配器。比 xp 和 vista 多得多。我只配置了一张卡，但似乎获得了三个不同的网络接口

• Intel(R) 82567LM-3 千兆位网络连接
• Intel(R) 82567LM-3 千兆位网络连接-QoS Packet Scheduler-0000
• Intel(R) 82567LM-3 千兆位网络连接-WFP LightWeight Filter-0000

为什么本质上相同的事情有 3 个不同的点。

我还有六个名为 WAN MINIPORT 的条目。 （请参阅下面的输出）

我可以过滤掉这些，但是当然，经历这么多垃圾会带来性能成本。有谁知道为什么创建这些条目以及如何最小化它们？

作为我系统上的一个例子，我写了这样的代码

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;

import static java.lang.System.out;


public class ListNetsEx {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Enumeration<NetworkInterface> nets;
        try {
            nets = NetworkInterface.getNetworkInterfaces();
            for (NetworkInterface netint : Collections.list(nets))
                displayInterfaceInformation(netint);
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    private static void displayInterfaceInformation(NetworkInterface netint) throws SocketException {
        // TODO Auto-generated method stub
        out.printf("Display name: %s\n", netint.getDisplayName());
        out.printf("Name: %s\n", netint.getName());
        Enumeration<InetAddress> inetAddresses = netint.getInetAddresses();

        for (InetAddress inetAddress : Collections.list(inetAddresses)) {
            out.printf("InetAddress: %s\n", inetAddress);
        }

        out.printf("Up? %s\n", netint.isUp());
        out.printf("Loopback? %s\n", netint.isLoopback());
        out.printf("PointToPoint? %s\n", netint.isPointToPoint());
        out.printf("Supports multicast? %s\n", netint.supportsMulticast());
        out.printf("Virtual? %s\n", netint.isVirtual());
        out.printf("Hardware address: %s\n",
                    Arrays.toString(netint.getHardwareAddress()));
        out.printf("MTU: %s\n", netint.getMTU());

        out.printf("\n");

    }

}

在 Windows 7 上输出是

Display name: Software Loopback Interface 1
Name: lo
InetAddress: /0:0:0:0:0:0:0:1
InetAddress: /127.0.0.1
Up? true
Loopback? true
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: []
MTU: -1

Display name: WAN Miniport (SSTP)
Name: net0
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (IKEv2)
Name: net1
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (L2TP)
Name: net2
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (PPTP)
Name: net3
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (PPPOE)
Name: ppp0
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (IPv6)
Name: eth0
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (Network Monitor)
Name: eth1
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (IP)
Name: eth2
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: RAS Async Adapter
Name: ppp1
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: Intel(R) 82567LM-3 Gigabit Network Connection
Name: eth3
InetAddress: /fe80:0:0:0:b1b1:7531:17b1:bf26%11
InetAddress: /172.24.9.148
Up? true
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: [120, 43, -53, 125, -80, 74]
MTU: 1500

Display name: Microsoft ISATAP Adapter
Name: net4
Up? false
Loopback? false
PointToPoint? true
Supports multicast? false
Virtual? false
Hardware address: [0, 0, 0, 0, 0, 0, 0, -32]
MTU: 1280

Display name: Teredo Tunneling Pseudo-Interface
Name: net5
InetAddress: /fe80:0:0:0:e0:0:0:0%13
Up? false
Loopback? false
PointToPoint? true
Supports multicast? false
Virtual? false
Hardware address: [0, 0, 0, 0, 0, 0, 0, -32]
MTU: 1280

Display name: Microsoft ISATAP Adapter #2
Name: net6
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: Intel(R) 82567LM-3 Gigabit Network Connection-QoS Packet Scheduler-0000
Name: eth4
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: Intel(R) 82567LM-3 Gigabit Network Connection-WFP LightWeight Filter-0000
Name: eth5
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (Network Monitor)-QoS Packet Scheduler-0000
Name: eth6
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (IP)-QoS Packet Scheduler-0000
Name: eth7
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Display name: WAN Miniport (IPv6)-QoS Packet Scheduler-0000
Name: eth8
Up? false
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: -1

Answer 1

Windows 定义了许多内部使用的接口。 Java 只返回操作系统告诉它的内容，这些都不是由 Java 添加的。

您应该能够在 Windows 注册表中找到所有这些设备的条目。