获取连接到/在VPN网络中的计算机的IP地址

时间:2016-11-15 10:29:52

标签: c# network-programming ip-address vpn

我需要知道连接到VPN的机器的IP地址。我使用了以下算法:

if (NetworkInterface.GetIsNetworkAvailable()) { // First check if any connections are present
NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
bool vpnExists=false;
string ipAddr="?";
foreach (NetworkInterface Interface in interfaces)
{ // Loop through all interfaces present
    if (Interface.OperationalStatus == OperationalStatus.Up)
    { // consider only if an interface is currently active
        if (Interface.NetworkInterfaceType == NetworkInterfaceType.Tunnel) // refering to vpn
        { // vpn found              
            vpnExists=true;
            foreach (UnicastIPAddressInformation ip in Interface.GetIPProperties().UnicastAddresses) { 
                // Program control reaches here without any problem
                if (ip.Address.AddressFamily==AddressFamily.InterNetwork) { // this block does not execute as expected
                    ipAddr=ip.Address.ToString();
                }
            }
        }
        else
        { // vpn not found
            continue; // Goto another interface
        }
    }
  }             
}
/*
Final state of variables:
   vpnExists: true
   ipAddr: "?"
*/

代码完全正常运行,直到VPN检查部分(对于我尝试过的所有网络),但在检测到VPN后不显示IP地址。我不明白为什么语句(ip.Address.AddressFamily==AddressFamily.InterNetwork)返回false,因为我认为这是获取IP地址的正确方法。

任何人都可以指出为什么会发生这种情况?深入的解释也会有所帮助。

提前致谢。

更新: 通过手动映射IP地址已解决此问题。无论如何,感谢所有感兴趣并帮助解决的人。

1 个答案:

答案 0 :(得分:1)

如果您的网络也支持IPv6,则应检查两者,而不是

if (ip.Address.AddressFamily == AddressFamily.InterNetwork)

使用:

if (ip.Address.AddressFamily == AddressFamily.InterNetwork
 || ip.Address.AddressFamily == AddressFamily.InterNetworkV6)

您可以查看AddressFamily枚举here on MSDN.

的所有值