Question

几天前，我问question有关通过特定网络适配器发送HttpWebRequest的问题，有人告诉我使用BindIPEndPointCallback。我试过这个：

public static IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
{
    List<IPEndPoint> ipep = new List<IPEndPoint>();
    foreach (var i in System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces())
    {
        foreach (var ua in i.GetIPProperties().UnicastAddresses)
            ipep.Add(new IPEndPoint(ua.Address, 0));
    }
    return new IPEndPoint(ipep[1].Address, ipep[1].Port);
}

private void button1_Click(object sender, EventArgs e)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://whatismyip.com");
    request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    StreamReader sr = new StreamReader(response.GetResponseStream());
    string x = sr.ReadToEnd();
}

但它仍然无效。它通过相同的网络适配器发送HttpWebRequest。还有什么我可以尝试的吗？

Answer 1

您尝试做的事情可能会或可能不会受到底层平台的支持。

谷歌的“强/弱主机型号”。

例如，这是对该主题的一个很好的介绍：

http://technet.microsoft.com/en-us/library/2007.09.cableguy.aspx

Answer 2

如果您的本地端点是private ip address（192.168.50.103），您的路由器会将该地址转换为不同的公共IP，这是whatsmyip可以看到的地址。

我建议你试试这个例子：

using System;
using System.Net;

class Program
{
    public static void Main ()
    {
        // TODO: Put your ip addresses in this list
        var ips = new IPAddress[]
        {
            IPAddress.Parse("10.0.0.3"),
            IPAddress.Parse("192.168.1.7")
        };

        foreach (var ip in ips)
        {
            try
            {
                Console.WriteLine("Request from: " + ip);
                var request = (HttpWebRequest)HttpWebRequest.Create("http://ns1.vianett.no/");
                request.ServicePoint.BindIPEndPointDelegate = delegate
                {
                    return new IPEndPoint(ip, 0);
                };
                var response = (HttpWebResponse)request.GetResponse();
                Console.WriteLine("Actual IP: " + response.GetResponseHeader("X-YourIP"));
                response.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

通过特定的网络适配器发送HttpWebRequest

2 个答案: