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Get the closest domain controller on the current AD site without hard coding information

In cases where Active Directory has been replicating data between sites for too long, I need to make sure that the local AD replica contains the latest information.

  • How can I get a list of DomainControllers for the current site?

I did not find anything on Codeproject or on StackOverflow

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4 answers

, , . , , . Microsoft, : http://technet.microsoft.com/en-us/library/cc978016.aspx.

DomainController.FindOne directorycontext.


, , , . , , -1 ( ), . PDC, . PDC, .

    static void Main(string[] args)
    {
        var dcsInOrder = (from DomainController c in Domain.GetCurrentDomain().DomainControllers
                          let responseTime = Pinger(c.Name)
                          where responseTime >=0
                          let pdcStatus = c.Roles.Contains(ActiveDirectoryRole.PdcRole)
                          orderby pdcStatus, responseTime
                          select new {DC = c, ResponseTime = responseTime} 
                          ).ToList();

        foreach (var dc in dcsInOrder)
        {
            System.Console.WriteLine(dc.DC.Name + " - " + dc.ResponseTime);
        }

        System.Console.ReadLine();
    }

    private static int Pinger(string address)
    {
        Ping p = new Ping();
        try
        {
            PingReply reply = p.Send(address, 3000);
            if (reply.Status == IPStatus.Success) return (int)reply.RoundtripTime;
        }
        catch { }

        return -1;

    }
+7

-, , :

System.DirectoryServices.ActiveDirectory.ActiveDirectorySite.GetComputerSite().Servers

, , , . Windows , , .

, , , - . Active Directory , .

MSDN ( Technet Peter) , DNS- DC Locator, DC . , Name Domain DNS.

, DomainController.FindOne DsGetDcName. , . , , , , PInvoke .

+2

, DC. .

    /// <summary>
    /// For best results ensure all hosts are pingable, and turned on.  
    /// </summary>
    /// <returns>An ordered list of DCs with the PDCE first</returns>
    static LinkedList<DomainController> GetNearbyDCs()
    {
        LinkedList<DomainController> preferredDCs = new LinkedList<DomainController>();
        List<string> TestedDCs = new List<string>();

        using (var mysite = ActiveDirectorySite.GetComputerSite())
        {
            using (var currentDomain = Domain.GetCurrentDomain())
            {
                DirectoryContext dctx = new DirectoryContext(DirectoryContextType.Domain, currentDomain.Name);
                var listOfDCs = DomainController.FindAll(dctx, mysite.Name);

                foreach (DomainController item in listOfDCs)
                {
                    Console.WriteLine(item.Name );
                    if (IsConnected(item.IPAddress))
                    {
                        // Enumerating "Roles" will cause the object to bind to the server
                        ActiveDirectoryRoleCollection rollColl = item.Roles;
                        if (rollColl.Count > 0)
                        {
                            foreach (ActiveDirectoryRole roleItem in rollColl)
                            {
                                if (!TestedDCs.Contains(item.Name))
                                {
                                    TestedDCs.Add(item.Name);
                                    if (roleItem == ActiveDirectoryRole.PdcRole)
                                    {
                                        preferredDCs.AddFirst(item);
                                        break;
                                    }
                                    else
                                    {

                                        if (preferredDCs.Count > 0)
                                        {
                                            var tmp = preferredDCs.First;
                                            preferredDCs.AddBefore(tmp, item);
                                        }
                                        else
                                        {
                                            preferredDCs.AddFirst(item);
                                        }
                                        break;
                                    }
                                } 

                            }
                        }
                        else
                        {
                            // The DC exists but has no roles
                            TestedDCs.Add(item.Name);
                            if (preferredDCs.Count > 0)
                            {
                                var tmp = preferredDCs.First;
                                preferredDCs.AddBefore(tmp, item);
                            }
                            else
                            {
                                preferredDCs.AddFirst(item);
                            }
                        }
                    }
                    else
                    {
                        preferredDCs.AddLast(item);
                    }
                }
            }
        }
        return preferredDCs;
    }
    static bool IsConnected(string hostToPing)
    {
        string pingurl = string.Format("{0}", hostToPing);
        string host = pingurl;
        bool result = false;
        Ping p = new Ping();
        try
        {
            PingReply reply = p.Send(host, 3000);
            if (reply.Status == IPStatus.Success)
                return true;
        }
        catch { }
        return result;
    }
+1

powershell, , # .. DHCP , DNS- . , IP- DNS . RSAT .

$NetItems = @(Get-WmiObject -Class Win32_NetworkAdapterConfiguration -Filter "IPEnabled = 'True'" -ComputerName $env:COMPUTERNAME)
foreach ($objItem in $NetItems)
{
    if ($objItem.{DNSServerSearchOrder}.Count -ge 1)
    {
        $PrimaryDNS = $objItem.DNSServerSearchOrder[0]
        $domain = $objItem.DNSDomain
        break
    }
}
[System.Net.Dns]::GetHostbyAddress($PrimaryDNS).hostname -replace ".$($domain)",""
0

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