无法连接到一个 VM 上的网络适配器，相同的代码适用于另一个 VM

Posted 2023-03-07

【中文标题】无法连接到一个 VM 上的网络适配器，相同的代码适用于另一个 VM

【英文标题】：Cannot attach to a network adapter on one VM, same code works on another VM

【发布时间】：2011-06-10 10:20:55

【问题描述】：

我需要从网卡获取性能计数器。为方便起见，用户通过在控制台应用程序中键入索引号来选择所需的适配器。

这是获取用户输入并创建性能计数器实例的代码

var connectionNames = NetworkCardLocator.GetConnectedCardNames().ToArray();
log.Debug("Please select one of the available connections");
log.Debug("--");
for (int i = 0; i < connectionNames.Count(); i++)

    log.Debug(i + ". " + connectionNames[i]);

log.Debug("--");
var key = Console.ReadLine();
int idx = 0;
Int32.TryParse(key, out idx);
string connectionName = connectionNames[idx];

var networkBytesSent = new PerformanceCounter("Network Interface", "Bytes Sent/sec", connectionName);
var networkBytesReceived = new PerformanceCounter("Network Interface", "Bytes Received/sec", connectionName);
var networkBytesTotal = new PerformanceCounter("Network Interface", "Bytes Total/sec", connectionName);

这就是我选择可用适配器的方式

internal static IEnumerable<string> GetConnectedCardNames()

    string query = String.Format(@"SELECT * FROM Win32_NetworkAdapter");
    var searcher = new ManagementObjectSearcher
    
        Query = new ObjectQuery(query)
    ;

    try
    
        log.Debug("Trying to select network adapters");
        var adapterObjects = searcher.Get();

        var names = (from ManagementObject o in adapterObjects
                        select o["Name"])
                            .Cast<string>();

        return names;
    
    catch (Exception ex)
    
        log.Debug("Failed to get needed names, see Exception log for details");
        log.Fatal(ex);
        throw;
    

问题 鉴于我选择了所需的适配器，代码可以在我的机器上运行（Win 2008 R2 Ent x64）。它不适用于我用于测试的某些 VM（Win 2008 R1 DC x86）。那里的任何选择都会给我一个例外（仍然适用于我的 PC 和 VM Win 2008 R1 Std x86）

foreach (PerformanceCounter counter in counters)

    float rawValue = counter.NextValue(); //thrown here
    ...


2011-06-10 11:08:20,505 [10] DEBUG TH.Exceptions Instance 'WAN Miniport (PPTP)' does not exist in the specified Category.
System.InvalidOperationException: Instance 'WAN Miniport (PPTP)' does not exist in the specified Category.
   at System.Diagnostics.CounterDefinitionSample.GetInstanceValue(String instanceName)
   at System.Diagnostics.PerformanceCounter.NextSample()
   at System.Diagnostics.PerformanceCounter.NextValue()
   at TH.PerformanceMonitor.API.Internal.PerformanceLogService.DoPerformanceLogging(IEnumerable`1 counters, Int32 interval, TimeSpan duration) in C:\Projects\...\PerformanceLogService.cs:line 122
   at TH.PerformanceMonitor.API.PerformanceManager.DoPerformanceLogging() in C:\Projects\...\PerformanceManager.cs:line 294
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

问 可能是什么问题，或者我该如何追查原因？

【参考方案1】：

问题出在phantom network adapters。从 VM 中删除它们后，一切都开始工作了。