ServicePointManager.EnableDnsRoundRobin Property

Reference

Definition

Namespace:: System.Net

Assemblies:: netstandard.dll, System.Net.Requests.dll

Assemblies:: netstandard.dll, System.Net.ServicePoint.dll

Assembly:: System.Net.ServicePoint.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Source:: ServicePointManager.cs

Source:: ServicePointManager.cs

Source:: ServicePointManager.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets a value that indicates whether a Domain Name Service (DNS) resolution rotates among the applicable Internet Protocol (IP) addresses.

public:
 static property bool EnableDnsRoundRobin { bool get(); void set(bool value); };

public static bool EnableDnsRoundRobin { get; set; }

static member EnableDnsRoundRobin : bool with get, set

Public Shared Property EnableDnsRoundRobin As Boolean

Property Value

Boolean

false if a DNS resolution always returns the first IP address for a particular host; otherwise true. The default is false.

Examples

The following code example sets this property.

ServicePointManager::UseNagleAlgorithm = true;
ServicePointManager::Expect100Continue = true;
ServicePointManager::CheckCertificateRevocationList = true;
ServicePointManager::DefaultConnectionLimit =
    ServicePointManager::DefaultPersistentConnectionLimit;
ServicePointManager::EnableDnsRoundRobin = true;
ServicePointManager::DnsRefreshTimeout = 4*60*1000; // 4 minutes

ServicePointManager.UseNagleAlgorithm = true;
ServicePointManager.Expect100Continue = true;
ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.DefaultConnectionLimit = ServicePointManager.DefaultPersistentConnectionLimit;
ServicePointManager.EnableDnsRoundRobin = true;
ServicePointManager.DnsRefreshTimeout = 4*60*1000; // 4 minutes

ServicePointManager.UseNagleAlgorithm = True
ServicePointManager.Expect100Continue = True
ServicePointManager.CheckCertificateRevocationList = True
ServicePointManager.DefaultConnectionLimit = _
    ServicePointManager.DefaultPersistentConnectionLimit
ServicePointManager.EnableDnsRoundRobin = True
ServicePointManager.DnsRefreshTimeout = 4*60*1000

Remarks

When more than one IP address is associated with a host name, a DNS resolution normally returns only the first IP address. If you set this property to true, then subsequent DNS resolutions will cycle through all available IP addresses for a particular host. This option is useful when a service uses DNS as a load balancing mechanism between servers or server clusters.

Note

This property is only implemented on .NET Framework.

Applies to

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

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