使用多个网卡获取正确的IP地址 [英] Get right ip adress of pc with multiple network cards

问题描述

Hej All，
我有一个监听套接字的应用程序。
问题是这台电脑有2个网卡，并连接到公司netork和plc网络，当然我们必须监听/绑定/ ...到我们从公司网络的DHCP获得的IP地址。

Hej All, I've an application that listens on a socket. The problem is that the pc has 2 network cards and is connected to the company netork and a plc network of course we have to listen/bind/... onto the IPAdress we got from the DHCP in the company network.

但是当我们这样做时：

System.Net.IPEndPoint(System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName).AddressList(0)

我们获得了PLC网络的IP。现在我们正在寻找一种动态查找正确的IP地址的方法。
我已经得到了一个可以将套接字绑定到IP地址的提示（0：0：0：0） ）但是我们认为这样做有点风险。

We get the IP of the PLC network. Now we are looking for a way to find dynamically the right IPAdress. I got already the tip that you can bind a socket to the IPAdress (0:0:0:0) but we think it's a bit risky to do so.

有没有人想要解决这个问题或有关0：0：0：0的一些评论？

Has anyone some ideas to solve this issue or some remarks about the 0:0:0:0?

提前致谢。

Jonathan

推荐答案

我让用户决定他/她想要连接到哪个网络接口并将其放在AppSetting中。
然后我创建一个模块来读取配置文件以决定要连接的网络接口to，以及检查和获取IPAddress我在vb.net中使用此代码

I let the user decide to what networkinterface he/she wanted to connect to and placed that in an AppSetting. Then I create a module that reads the config file to decide what networkinterface to connect to, and to check and get the IPAddress I use this code

：

 Dim networkinterfaces() As NetworkInterface = NetworkInterface.GetAllNetworkInterfaces()
            Dim found As Boolean = False

            For Each ni As NetworkInterface In networkinterfaces
                If NetworkInterfaceName.Equals(ni.Name) Then
                    If ni.GetPhysicalAddress().ToString().Length > 0 Then
                        IPAddressFromNetworkCard = ni.GetIPProperties.UnicastAddresses(0).Address
                        found = True
                        Exit For
                    End If
                End If
            Next

（更多跟踪，但它几乎相同）：

in c# (some more tracing, but it almost does the same):

Console.WriteLine("Test get ip of interfacecard");
            Console.WriteLine("Give name of interfacecard:");
            string s = Console.ReadLine();


            List<NetworkInterface> nics = NetworkInterface.GetAllNetworkInterfaces().ToList<NetworkInterface>();
            Console.WriteLine(nics.Count + "  networkinterfaces found");

            bool found = false;
            foreach (NetworkInterface ni in nics)
            {
                Console.WriteLine("Available nic: " + ni.Name);
            }
            Console.WriteLine("");
            Console.WriteLine(String.Format("searching for: \"{0}\"", s));
            foreach (NetworkInterface ni in nics)
            {
                if (ni.Name.Equals(s))
                {
                    if (ni.GetPhysicalAddress().ToString().Length > 0)
                    {
                        Console.WriteLine("Network interface found, ipAddress: " + ni.GetIPProperties().UnicastAddresses[0].Address.ToString());
                        found = true;
                        break;
                    }
                }

            }
            if (!found)
                Console.WriteLine(String.Format("\"{0}\" not found", s));

            Console.ReadKey();

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